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Colorado State University
1.
Mata Carrillo, Oscar Rafael.
Evaluating the bond durability of FRP-concrete systems subjected to environmental exposures.
Degree: MS(M.S.), Civil and Environmental Engineering, 2012, Colorado State University
URL: http://hdl.handle.net/10217/74420
► The poor current condition of transportation infrastructure in the U.S. is well documented. With traffic volumes on the rise, as well as limited funding available…
(more)
▼ The poor current condition of transportation infrastructure in the U.S. is well documented. With traffic volumes on the rise, as well as limited funding available to maintain and rehabilitate aging bridges, cost effective means of improving the performance and durability of these structures must be employed. Fiber Reinforced Polymers (FRPs) offer one potential solution. Their use has been progressively growing in the field of civil engineering as the material's high strength to weight ratio, non-corrosive nature, and ability to conform to existing geometry make it appealing in the reinforcement of existing reinforced concrete structures. In most applications of FRP to strengthen an existing structure, the FRP-concrete bond is essential. Bond is needed for proper transfer of stresses among interfaces. From a durability standpoint, the long-term bond performance is also a major concern. As a result, a long-term durability study was conducted in the laboratory to evaluate the behavior of the bond between the FRP and concrete. Small concrete specimens were prepared, reinforced with FRP material, and subjected to various environmental scenarios such as wet-dry cycles, freeze-thaw cycles, and constant immersion in water, as well as deicing agents. Direct tension pull-off tests and three-point flexural tests were conducted on these specimens to determine any degradation in bond strength over time. Finally, the pull-off test method was evaluated by means of previous research studies and recommendations about preparation procedures were made.
Advisors/Committee Members: Atadero, Rebecca (advisor), Heyliger, Paul (committee member), Glick, Scott (committee member).
Subjects/Keywords: bond; pull off tests; FRP; durability; concrete
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APA (6th Edition):
Mata Carrillo, O. R. (2012). Evaluating the bond durability of FRP-concrete systems subjected to environmental exposures. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/74420
Chicago Manual of Style (16th Edition):
Mata Carrillo, Oscar Rafael. “Evaluating the bond durability of FRP-concrete systems subjected to environmental exposures.” 2012. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/74420.
MLA Handbook (7th Edition):
Mata Carrillo, Oscar Rafael. “Evaluating the bond durability of FRP-concrete systems subjected to environmental exposures.” 2012. Web. 05 Mar 2021.
Vancouver:
Mata Carrillo OR. Evaluating the bond durability of FRP-concrete systems subjected to environmental exposures. [Internet] [Masters thesis]. Colorado State University; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/74420.
Council of Science Editors:
Mata Carrillo OR. Evaluating the bond durability of FRP-concrete systems subjected to environmental exposures. [Masters Thesis]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/74420

Colorado State University
2.
Peterson, Kirsten LaRhea.
Mechanics of plastic-aluminum composite I-beams, The.
Degree: MS(M.S.), Civil and Environmental Engineering, 2014, Colorado State University
URL: http://hdl.handle.net/10217/82630
► This thesis presents an initial investigation of the mechanics of I-beams developed with plastic-aluminum composite technology. Plastic-aluminum composites in structural beam/frame/truss elements are a relatively…
(more)
▼ This thesis presents an initial investigation of the mechanics of I-beams developed with plastic-aluminum composite technology. Plastic-aluminum composites in structural beam/frame/truss elements are a relatively new concept that has seen little, if any, application in modern construction. This technology has considerable potential to add innovative choices to the array of materials currently available in the construction industry. Several new tests were designed and performed on different portions of the beams, including Push-Through and Knit-Line Pull tests, and tensile tests per ASTM D638-10. The results of these tests showed increased strength with an increase of talc filler content and also showed that the addition of a metal deactivator additive to the plastic results in a slight increase in strength. Duration of Load tests were performed per ASTM D7031-04 and none of the beams tested exhibit tertiary creep. The I-beams investigated here use an internal shear connector (deboss) which acts as a mechanical fastener between the aluminum and the flange plastic. A numerical finite element model was developed in ABAQUS to better understand the underlying physics of the deboss and was compared with a Push-Through test specimen. The results from the model closely match experimental results and the model can be used to predict within 10% the load per deboss region that can be resisted before the plastic begins to yield and extensively deform. This model can be used for differing deboss geometries and any plastic with known material properties. Overall, the results of this research support potential future research involving a more in-depth investigation of this innovative, new class of material technology for use as a structural material.
Advisors/Committee Members: Heyliger, Paul (advisor), Atadero, Rebecca (committee member), Leisure, Robert (committee member).
Subjects/Keywords: beam mechanics; structures; plastic-metal composites; I-beams; composite materials
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APA (6th Edition):
Peterson, K. L. (2014). Mechanics of plastic-aluminum composite I-beams, The. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/82630
Chicago Manual of Style (16th Edition):
Peterson, Kirsten LaRhea. “Mechanics of plastic-aluminum composite I-beams, The.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/82630.
MLA Handbook (7th Edition):
Peterson, Kirsten LaRhea. “Mechanics of plastic-aluminum composite I-beams, The.” 2014. Web. 05 Mar 2021.
Vancouver:
Peterson KL. Mechanics of plastic-aluminum composite I-beams, The. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/82630.
Council of Science Editors:
Peterson KL. Mechanics of plastic-aluminum composite I-beams, The. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/82630

Colorado State University
3.
Plankis, Alivia.
Structural health monitoring MEMS sensors using elasticity-based beam vibrations.
Degree: MS(M.S.), Civil and Environmental Engineering, 2012, Colorado State University
URL: http://hdl.handle.net/10217/67898
► The worsening problem of aging and deficient infrastructure in this nation and across the world has demonstrated the need for an improved system to monitor…
(more)
▼ The worsening problem of aging and deficient infrastructure in this nation and across the world has demonstrated the need for an improved system to monitor and maintain these structures. The field of structural health monitoring has grown in recent years to address this issue. The goal of this field is to continually monitor the condition of a structure to detect and mitigate damage that may occur. Many structural health monitoring methods have been developed and most of these require sensor systems to collect the necessary information to assess the current strength and integrity of a structure. The motivation for this thesis is a proposed new microelectromechanical systems (MEMS) sensor with applications in civil infrastructure sensing. The work required was to determine accurate estimates of the resonant frequencies for a fixed-fixed silicon bridge within the device so that further testing and development could proceed. Additional knowledge and information were essential, though, before these requested calculations could be performed confidently. First, a thorough review of current structural health monitoring concepts and methods was performed to better understand the field in which this device would be applied and what incentive existed to develop a new sensor. Second, an in-depth investigation of vibrational beam mechanics theories was completed to ensure the accuracy of the frequency results for the new MEMS sensor. This study analyzed the influence of three assumptions employed in the Euler-Bernoulli, Rayleigh, and Timoshenko beam theories by comparing their results to a three-dimensional, elasticity-based approximation for vibrational frequencies and mode shapes. The results of this study showed that all three theories are insufficient when a fixed support is involved, so the elasticity-based approximation was utilized to calculate the frequencies for the bridge component in the MEMS device. These results have been passed on to the developers so that the testing process could move forward in the hopes that the device could advance the field of structural health monitoring in the future.
Advisors/Committee Members: Heyliger, Paul (advisor), Atadero, Rebecca (committee member), Leisure, Robert (committee member).
Subjects/Keywords: beam vibration; structural health monitoring; MEMS
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
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APA (6th Edition):
Plankis, A. (2012). Structural health monitoring MEMS sensors using elasticity-based beam vibrations. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/67898
Chicago Manual of Style (16th Edition):
Plankis, Alivia. “Structural health monitoring MEMS sensors using elasticity-based beam vibrations.” 2012. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/67898.
MLA Handbook (7th Edition):
Plankis, Alivia. “Structural health monitoring MEMS sensors using elasticity-based beam vibrations.” 2012. Web. 05 Mar 2021.
Vancouver:
Plankis A. Structural health monitoring MEMS sensors using elasticity-based beam vibrations. [Internet] [Masters thesis]. Colorado State University; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/67898.
Council of Science Editors:
Plankis A. Structural health monitoring MEMS sensors using elasticity-based beam vibrations. [Masters Thesis]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/67898

Colorado State University
4.
Inguva, Girija.
Differences for employees who use BIM/VDC in the construction workplace.
Degree: MS(M.S.), Construction Management, 2014, Colorado State University
URL: http://hdl.handle.net/10217/88558
► There is growing recognition across the US construction industry for the benefits of organizational adoption of Building Information Modeling, also referred to as Virtual Design…
(more)
▼ There is growing recognition across the US construction industry for the benefits of organizational adoption of Building Information Modeling, also referred to as Virtual Design and Construction (BIM/VDC). One of the key factors that enables successful organizational adoption of new technologies is the adoption of these technologies by key participants, in this case by BIM employees. Their positive experiences at their current organization determine their continuation on a BIM/VDC path, thus leading to consistent organizational adoption and negative experiences could mean that they migrate from a BIM career to a Non-BIM career or to another organization to seek better experiences. This research aims to study the perceptions of BIM employees as compared to the perceptions of Non-BIM employees in the construction industry in four key categories: work life balance, career advancement, workplace experience and skill levels. An online survey is used and responses are compared first using averages and then using Pearson's X2 or Fisher's probability test to test for statistical significance where applicable. Differences inform us of the advantages or challenges of a BIM/VDC career at an individual level. Additionally, differences between men and women are also studied, along with differences between BIM employees from organizations with a separate BIM/VDC department and BIM employees from organizations without a separate BIM/VDC department. The general trends observed in terms of averages indicate that BIM/VDC personnel are generally more satisfied with their jobs and consider common barriers to career advancement to be of lesser relevance than their Non-BIM counterparts. The fact that most differences are not statistically different also suggests that BIM employees may not be treated that differently from Non-BIM employees. Of all groups, the most positive perceptions are reported by male BIM respondents from organizations without separate BIM/VDC departments.
Advisors/Committee Members: Clevenger, Caroline (advisor), Ozbek, Mehmet (committee member), Atadero, Rebecca (committee member).
Subjects/Keywords: BIM; VDC; employee perceptions; construction management; building information modeling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
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APA (6th Edition):
Inguva, G. (2014). Differences for employees who use BIM/VDC in the construction workplace. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/88558
Chicago Manual of Style (16th Edition):
Inguva, Girija. “Differences for employees who use BIM/VDC in the construction workplace.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/88558.
MLA Handbook (7th Edition):
Inguva, Girija. “Differences for employees who use BIM/VDC in the construction workplace.” 2014. Web. 05 Mar 2021.
Vancouver:
Inguva G. Differences for employees who use BIM/VDC in the construction workplace. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/88558.
Council of Science Editors:
Inguva G. Differences for employees who use BIM/VDC in the construction workplace. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/88558

Colorado State University
5.
Turbert, Collin.
Effect of fire and fire following an earthquake on steel reduced beam section moment connections.
Degree: MS(M.S.), Civil and Environmental Engineering, 2013, Colorado State University
URL: http://hdl.handle.net/10217/80291
► The main objective of this research is to investigate the behavior of steel frames with reduced beam sections (RBS) during a fire as well as…
(more)
▼ The main objective of this research is to investigate the behavior of steel frames with reduced beam sections (RBS) during a fire as well as during the combined events of fire following an earthquake (FFE). Historical events and recent disasters have clearly demonstrated that the occurrence of these two events (fire and FFE) within steel framed buildings represents a probable scenario that warrants further investigation. Accurate analytical evaluation of the structural behavior of steel buildings under fire, and to a lesser extent an earthquake, is difficult due to the many complex and uncertain phenomena involved. Detailed numerical modeling of the overall structural system has been shown to provide the most reliable simulation results under current research development. However, detailed analysis is generally computationally expensive and as such not practically applicable. In addition, the nonlinear behavior of entire structures is complex and not fully understood. Therefore, detailed numerical models of the overall structural system often have difficulty capturing local failure modes. This research provides a practical analytical approach to perform accurate numerical evaluation of steel structures under fire and FFE and to closely investigate its characteristic behavior. The approach utilized is to limit the focus on localized compartment fires and investigate the behavior of a single beam-column subassembly within the chosen compartment. By limiting the focus of the study the numerical models can be simplified by utilizing specifically appropriate subassembly models for the analysis. Using the finite element program ABAQUS, two different beam-column subassemblies with RBS were created and analyzed. The subassemblies are representative of actual connections in two steel special moment resisting frames that were designed for the highly seismic Los Angeles region. The frames selected for analysis are an 8-story 4-bay frame and a 16-story 4-bay frame and the selected subassemblies are located at the exterior of the frames at the mid and lower levels, respectively. Both subassemblies were analyzed under fire alone to determine their structural behavior during the event as well as allow for a better understanding of the influence the seismic demand has on the behavior of the connection when exposed to FFE. For the FFE simulations both models were analyzed under a suite of earthquake ground motions followed by a fire simulation. For the fire analysis portion of both simulations (fire alone and FFE) a sequentially coupled thermo-mechanical modeling technique, which includes representative constraint elements to simulate the restraint imposed by the frame is employed. The results of the study highlight the significance of including realistic boundary conditions during fire simulations and points towards the possibility for the occurrence of substantial damage in unprotected steel frames during fire as well as protected steel frames during fire following an earthquake.
Advisors/Committee Members: Mahmoud, Hussam (advisor), Atadero, Rebecca (committee member), Kirkpatrick, Allan (committee member).
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Turbert, C. (2013). Effect of fire and fire following an earthquake on steel reduced beam section moment connections. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/80291
Chicago Manual of Style (16th Edition):
Turbert, Collin. “Effect of fire and fire following an earthquake on steel reduced beam section moment connections.” 2013. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/80291.
MLA Handbook (7th Edition):
Turbert, Collin. “Effect of fire and fire following an earthquake on steel reduced beam section moment connections.” 2013. Web. 05 Mar 2021.
Vancouver:
Turbert C. Effect of fire and fire following an earthquake on steel reduced beam section moment connections. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/80291.
Council of Science Editors:
Turbert C. Effect of fire and fire following an earthquake on steel reduced beam section moment connections. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/80291

Colorado State University
6.
Sobieck, Tyler.
Predicting fatigue life extension of steel reinforcement in RC beams repaired with externally bonded CFRP.
Degree: MS(M.S.), Civil and Environmental Engineering, 2014, Colorado State University
URL: http://hdl.handle.net/10217/84143
► A majority of the United States' transportation infrastructure is over 50 years old with one in nine bridges being considered structurally deficient. Fatigue damage accumulation…
(more)
▼ A majority of the United States' transportation infrastructure is over 50 years old with one in nine bridges being considered structurally deficient. Fatigue damage accumulation in bridge structures, generated by cyclic loading of passing traffic, has led to shorter service lives. Over the past few decades studies have shown carbon fiber reinforced polymer (CFRP) repairs to be an effective means of reducing fatigue damage accumulation in reinforced concrete (RC) girders. Despite the abundant research, the results, specifically the increase in fatigue life, vary widely making it difficult to apply them directly to repair designs. Therefore, design codes and guidelines presently in use are insufficient in providing engineers with the proper information to determine the extended fatigue life of the RC bridges repaired with CFRP. Current design codes
state FRP repairs should limit the stress range in the reinforcing bars below the threshold where fatigue cracks can propagate. The problem with this philosophy is it essentially designs an overly conservative system with an infinite fatigue life. The proposed approach follows a performance based design philosophy for which the engineer designs for a specified extension in service life by limiting the crack growth rate in the reinforcement so the critical crack length, for which fracture in the reinforcement would occur, is never reached in the extended life. In this thesis, the results of experimental fatigue testing of control and CFRP repaired RC beams are highlighted and the fatigue crack propagation rate in the steel reinforcement is assessed for different repair schemes. The focus on steel reinforcement crack propagation rates was made because similar studies have found the reinforcement to be the limiting fatigue component in RC bridge girders. The results of the experimental study showed an extended fatigue life and a slowed crack growth rate in specimens repaired with both CFRP systems. The crack growth rates were then used to determine the material constants for the Pairs Law, which describes growth of a stable fatigue crack. These results were then used to propose recommendations for design of FRP repair systems for RC flexural members for a specific fatigue life.
Advisors/Committee Members: Atadero, Rebecca (advisor), Mahmoud, Hussam (advisor), Radford, Donald (committee member).
Subjects/Keywords: concrete beams; CFRP; fatigue; rehabilitation; reinforcing steel; crack propagation
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sobieck, T. (2014). Predicting fatigue life extension of steel reinforcement in RC beams repaired with externally bonded CFRP. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/84143
Chicago Manual of Style (16th Edition):
Sobieck, Tyler. “Predicting fatigue life extension of steel reinforcement in RC beams repaired with externally bonded CFRP.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/84143.
MLA Handbook (7th Edition):
Sobieck, Tyler. “Predicting fatigue life extension of steel reinforcement in RC beams repaired with externally bonded CFRP.” 2014. Web. 05 Mar 2021.
Vancouver:
Sobieck T. Predicting fatigue life extension of steel reinforcement in RC beams repaired with externally bonded CFRP. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/84143.
Council of Science Editors:
Sobieck T. Predicting fatigue life extension of steel reinforcement in RC beams repaired with externally bonded CFRP. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/84143

Colorado State University
7.
Admuthe, Sushant Ajay.
Semi-rigid steel frames subjected to mainshock-aftershock earthquake sequences.
Degree: MS(M.S.), Civil and Environmental Engineering, 2018, Colorado State University
URL: http://hdl.handle.net/10217/189411
► In a typical seismic event, large number of aftershocks are generally triggered due to the complex interaction within and between tectonic plates. Despite the fact…
(more)
▼ In a typical seismic event, large number of aftershocks are generally triggered due to the complex interaction within and between tectonic plates. Despite the fact that aftershocks are typically smaller in magnitude than mainshocks, their ground-motion intensity, measured by peak ground acceleration, is not always smaller. As a result, vulnerability of structures to extensive damage and complete collapse as a result of the aftershocks increases. In spite of their in evaluating the true risk of system failure and collapse, the inclusion of aftershocks in code provisions and guidelines for seismic risk assessment and performance-based engineering is lacking. In this study, three semi-rigid frames, with connection capacity of 50%, 60% and 70% of the plastic moment of the beam, were designed and their performance under mainshock-aftershock sequences assessed. The objective of this study, pertaining to the seismic performance of the frames, was twofold. First was to develop fragility functions for the frames under sequential mainshock-aftershock hazards as the basic ingredient for performance-based engineering. Second, was to evaluate the extent of spread of inelasticity and period elongation as a result of the sequential events. The first objective was realized through performing incremental dynamic analysis (IDA) using a new set of ground-motion records, with naturally available aftershock data. Scaling of the aftershocks for the IDA was performed while maintaining the Peak Ground Acceleration (PGA) relationship, established priori, between the respective mainshock and aftershock events. The results showed that the inclusion of the aftershocks increase the probability of reaching or exceeding a particular damage
state. The increase in the probability is higher for the complete damage
state and lower for the slight damage
state. In other words, the probability, of the structure slightly or moderately damaged in the mainshock, to exceed the same damage
state is not increased in aftershocks but in the case of extensive and complete damage, there is considerable increase in the probability of exceeding the same damage
state in aftershock. In addition assessment of the spread of inelasticity and period elongation, performed using Short-Term-Fourier-Transformation, show that a relationship between the elongated period and connection capacities for different ground-motion intensities can be established.
Advisors/Committee Members: Mahmoud, Hussam (advisor), Atadero, Rebecca (committee member), Shuler, Scott (committee member).
Subjects/Keywords: mainshock; semi-rigid frames; period elongation; aftershock
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Admuthe, S. A. (2018). Semi-rigid steel frames subjected to mainshock-aftershock earthquake sequences. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/189411
Chicago Manual of Style (16th Edition):
Admuthe, Sushant Ajay. “Semi-rigid steel frames subjected to mainshock-aftershock earthquake sequences.” 2018. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/189411.
MLA Handbook (7th Edition):
Admuthe, Sushant Ajay. “Semi-rigid steel frames subjected to mainshock-aftershock earthquake sequences.” 2018. Web. 05 Mar 2021.
Vancouver:
Admuthe SA. Semi-rigid steel frames subjected to mainshock-aftershock earthquake sequences. [Internet] [Masters thesis]. Colorado State University; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/189411.
Council of Science Editors:
Admuthe SA. Semi-rigid steel frames subjected to mainshock-aftershock earthquake sequences. [Masters Thesis]. Colorado State University; 2018. Available from: http://hdl.handle.net/10217/189411

Colorado State University
8.
John, Jeswin.
Mechanics of extendable wind turbine blades.
Degree: MS(M.S.), Civil and Environmental Engineering, 2015, Colorado State University
URL: http://hdl.handle.net/10217/166942
► This research aims at understanding the reductions in deflection, stress, and natural frequency of extendable wind turbine blades. For that purpose, a comparative study of…
(more)
▼ This research aims at understanding the reductions in deflection, stress, and natural frequency of extendable wind turbine blades. For that purpose, a comparative study of these properties for the extendable turbine blade compared with those of a conventional turbine blade was completed. Wind turbine blades have seen extensive growth in application, and extendable turbine blades are a novel advancement over conventional blades. They can be more efficient in extracting energy from wind and are much more practical for transportation purposes. Lengths of the turbine blade have been increasing every year, and the next logical step is to consider making them extendable. In this research, a basic model of the blade was created and then a three-dimensional linear elasticity model was used and studied using the finite element method for analyzing the crucial parameters. In addition to this, two different load cases and six different retracted blade positions were analyzed for in-depth study of the blade behavior. As far as loading is considered, an initial analysis was completed using the wind load alone to give a basic idea of how the model behaves under standard parked conditions. In the second case, both wind and dead load were considered to help understand the blade behavior from a more practical perspective. Overall, the research gives estimates of the reductions in stress, displacement, and natural frequency when the blades are extendable and gives better understanding into the design parameters of these novel structures.
Advisors/Committee Members: Heyliger, Paul (advisor), Atadero, Rebecca (committee member), Radford, Donald (committee member).
Subjects/Keywords: retractable turbine blades; extendable turbine blades; variblade
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
John, J. (2015). Mechanics of extendable wind turbine blades. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/166942
Chicago Manual of Style (16th Edition):
John, Jeswin. “Mechanics of extendable wind turbine blades.” 2015. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/166942.
MLA Handbook (7th Edition):
John, Jeswin. “Mechanics of extendable wind turbine blades.” 2015. Web. 05 Mar 2021.
Vancouver:
John J. Mechanics of extendable wind turbine blades. [Internet] [Masters thesis]. Colorado State University; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/166942.
Council of Science Editors:
John J. Mechanics of extendable wind turbine blades. [Masters Thesis]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/166942

Colorado State University
9.
Vemuri, Sri Harsha.
Evaluation of rapid scanning techniques for inspecting concrete bridge decks with asphalt overlay.
Degree: MS(M.S.), Civil and Environmental Engineering, 2016, Colorado State University
URL: http://hdl.handle.net/10217/173481
► The average age of bridges in the USA is 42 years. The life expectancy of a majority of these bridges is 50 years. At the…
(more)
▼ The average age of bridges in the USA is 42 years. The life expectancy of a majority of these bridges is 50 years. At the current rates of aging and replacement, almost half of the nation’s bridges will require major structural investment in the next 15 years as stated by the Federal Highway Administration. There is a severe deficiency in both time and resources available to address this problem, and methods to increase efficiency are needed. Bridge decks are the most critical elements of a bridge structure as they are directly and continuously exposed to harsh weather conditions and cyclic loading from traffic throughout their lifespan. This thesis attempts to improve management practices for bridge decks by addressing current challenges faced by the
Colorado Department of Transportation (CDOT) in estimating the extent of damage on bridge decks. The current bridge deck inspection method being employed by CDOT is sounding and chipping. This procedure involves sounding the deck with chains, hammers and rotary percussion to detect the deteriorated areas followed by chipping. The issues with this procedure include its time-consuming nature, the requirement for traffic to be diverted for extended periods and the costs associated with the inspection and traffic diversion. Additionally, sounding is not adequate to provide a rough estimation of the class of damaged area and the resulting expenses. CDOT wants to take the advantage of newer alternative techniques to evaluate bridge decks. The alternative evaluation considered by CDOT involves using Ground Penetrating Radar (GPR) and Infrared Thermography (IR) thermography together for evaluating bridge decks. The major advantage of using GPR is that it is the only available method that can estimate the deterioration in concrete decks with asphalt overlay. Additionally, GPR can estimate the deterioration in early stages, unlike sounding which detects damage in advanced stages and GPR is also capable of detecting corrosion in rebars. Thus, GPR not only has the potential to address the disadvantages of sounding it also has additional advantages which can benefit the life of the bridge deck. This study attempts to understand the limitations that this newer evaluation method comes with and possibly solve some of these limitations to take complete advantage of this technology. This study took advantage of the available as-built data of four bridge decks rebuilt after sounding and chipping and the data available from GPR and IR scanning of the respective decks to study the limitations from using GPR and IR technologies. The scanned results from GPR and IR thermography are compared to the deck condition data from sounding and chipping. In two cases the damage detected by GPR and IR thermography did not correlate well with the damage detected from sounding and chipping. The two decks with reasonable correlation are compared to the decks with poor correlation in an effort to understand the possible causes for deviation in results. It was observed that for the decks with poor…
Advisors/Committee Members: Atadero, Rebecca (advisor), Chen, Suren (committee member), Strong, Kelly (committee member).
Subjects/Keywords: bridge deck evaluation; GPR; NDE; bridge deck inspection; bridge deck; IR
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APA (6th Edition):
Vemuri, S. H. (2016). Evaluation of rapid scanning techniques for inspecting concrete bridge decks with asphalt overlay. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/173481
Chicago Manual of Style (16th Edition):
Vemuri, Sri Harsha. “Evaluation of rapid scanning techniques for inspecting concrete bridge decks with asphalt overlay.” 2016. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/173481.
MLA Handbook (7th Edition):
Vemuri, Sri Harsha. “Evaluation of rapid scanning techniques for inspecting concrete bridge decks with asphalt overlay.” 2016. Web. 05 Mar 2021.
Vancouver:
Vemuri SH. Evaluation of rapid scanning techniques for inspecting concrete bridge decks with asphalt overlay. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/173481.
Council of Science Editors:
Vemuri SH. Evaluation of rapid scanning techniques for inspecting concrete bridge decks with asphalt overlay. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/173481

Colorado State University
10.
Cheng, Guo.
Framework for life-cycle cost optimization of buildings under seismic and wind hazards, A.
Degree: MS(M.S.), Civil and Environmental Engineering, 2014, Colorado State University
URL: http://hdl.handle.net/10217/83881
► The consequential life and economic impact resulting from the exposure of building structures to single hazards have been well quantified for seismic and wind loading.…
(more)
▼ The consequential life and economic impact resulting from the exposure of building structures to single hazards have been well quantified for seismic and wind loading. While it has been recognized that structures are likely to be subjected to multiple hazards during their service life, designing for such scenario has been achieved by as considering the predominant hazard. Although from a structural reliability perspective, this might be a reasonable approach, it does not necessarily result in the most optimal life-cycle cost for the designed structure. Although such observation has been highlighted in recent studies, research is still needed for developing an approach for multi-hazard life-cycle optimization of structures. This study presents a framework, utilizing structural reliability, for cost optimization of structures under wind and seismic hazards. Two example structures, on which the framework is applied, are investigated and their life-cycle cost analyzed. The structures represent typical medium and high rise residential buildings located in downtown San Francisco area. The framework comprises of using the first order reliability method (FORM), programed in MATLAB and interfaced with ABAQUS finite element software to obtain the corresponding reliability factors for the buildings under various loading intensities characterized by the probability of exceedance. The finite element analyses are carried out based on real seismic and wind pressure records using nonlinear finite element time-history dynamic analysis. The random variables selected include hazard intensity (wind load and seismic intensity) and elastic modulus of steel. Once the failure probabilities are determined for the given limit
state functions, the expected failure cost for the building service duration considering earthquake or wind hazard, or both, is calculated considering discount rate. The expected life-cycle cost is evaluated using life-cycle cost function, which includes the initial construction cost and the expected failure cost. The results show that the optimal building design considering the wind hazard alone, the seismic hazard alone or a combination of both is different. The framework can be utilized for an optimal design of both wind and seismic load for a given level of hazard intensity.
Advisors/Committee Members: Mahmoud, Hussam (advisor), Atadero, Rebecca (committee member), Strong, Kelly (committee member).
Subjects/Keywords: finite element; reliability; multiple hazard
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Cheng, G. (2014). Framework for life-cycle cost optimization of buildings under seismic and wind hazards, A. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/83881
Chicago Manual of Style (16th Edition):
Cheng, Guo. “Framework for life-cycle cost optimization of buildings under seismic and wind hazards, A.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/83881.
MLA Handbook (7th Edition):
Cheng, Guo. “Framework for life-cycle cost optimization of buildings under seismic and wind hazards, A.” 2014. Web. 05 Mar 2021.
Vancouver:
Cheng G. Framework for life-cycle cost optimization of buildings under seismic and wind hazards, A. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/83881.
Council of Science Editors:
Cheng G. Framework for life-cycle cost optimization of buildings under seismic and wind hazards, A. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/83881

Colorado State University
11.
Sanders, Patrick.
Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation.
Degree: MS(M.S.), Civil and Environmental Engineering, 2015, Colorado State University
URL: http://hdl.handle.net/10217/167220
► The bridge inspection program in the United States started in 1971 following the collapse of the Silver Bridge in Ohio. Since then, bridges have generally…
(more)
▼ The bridge inspection program in the United States started in 1971 following the collapse of the Silver Bridge in Ohio. Since then, bridges have generally been inspected every two years. This uniform inspection interval for all bridges is not the most efficient system for conducting inspections because many bridges do not require inspections this frequently, and leads to unnecessary use of inspection resources on bridges that do not require them. Efforts toward changing the bridge inspection program to a risk-based program are being made. Such a program would allow for bridge inspection timing to be based on each particular bridge’s need, and each bridge would then be inspected for the components that present the highest risk to the structure. The research presented herein focuses on using the uncertainty in the current condition of concrete bridge decks to plan inspection timing, and to plan inspection type based on limited resources. A mathematical program called Concrete Deck Cracking Probability Model (CDCPM) is written in MATLAB to model the uncertainty in the occurrence of transverse cracking and delamination in the deck. Through literature review, mechanistic models of the processes that affect cracking are determined and implemented in the program. Using Monte Carlo simulations, the uncertainty in the occurrence of cracking and delamination is analyzed based on the input parameter uncertainty. The effect of different climates and mechanistic models on the prediction of cracking is explored using CDCPM. This model is then applied to a bridge in Larimer County,
Colorado to see how the results compare to actual inspection results, and then the model is used to plan a future delamination inspection on the bridge. Another scenario is investigated where CDCPM is used together with uncertainty forecast plots to allocate inspection resources to two bridge decks. CDCPM revealed that the uncertainty in the current bridge condition is heavily influenced by the mechanistic models chosen for the analysis, as well as some of the parameters used in the models. The surface chloride content has a large effect on the delamination of the concrete deck, while the relative humidity and ambient temperature for a given location can affect the probability of transverse cracking. Analysis of the Larimer County bridge inspection reports showed that the model can be good indicator of future damage to the deck. The model provides unique insight into inspection planning using uncertainty. Using the model output along with uncertainty forecast plots of different inspection methods, the inspection manager is provided with a useful planning tool that gives information on the effect of inspection methods on bridge condition assessment. Suggestions for implementing the bridge inspection plan for agency use is also provided.
Advisors/Committee Members: Atadero, Rebecca (advisor), Ozbek, Mehmet (advisor), Senior, Bolivar (committee member).
Subjects/Keywords: bridge inspection; bridge deck modeling
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Sanders, P. (2015). Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/167220
Chicago Manual of Style (16th Edition):
Sanders, Patrick. “Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation.” 2015. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/167220.
MLA Handbook (7th Edition):
Sanders, Patrick. “Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation.” 2015. Web. 05 Mar 2021.
Vancouver:
Sanders P. Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation. [Internet] [Masters thesis]. Colorado State University; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/167220.
Council of Science Editors:
Sanders P. Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation. [Masters Thesis]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/167220

Colorado State University
12.
Rager, Karly.
Joint elimination retrofits and thermal loading analysis in plate girder bridge using health monitoring and finite element simulations.
Degree: MS(M.S.), Civil and Environmental Engineering, 2016, Colorado State University
URL: http://hdl.handle.net/10217/176597
► Degradation of United States' public infrastructure has attracted attention from the public and governing agencies alike. A challenge facing transportation departments is management of leaking…
(more)
▼ Degradation of United States' public infrastructure has attracted attention from the public and governing agencies alike. A challenge facing transportation departments is management of leaking and clogged expansion joints in bridge structures, which result in significant deterioration to bridge substructures and superstructures. Some agencies have started eliminating these joints. However, technical understanding of which retrofit methodology to employ based on thermal loading and specific characteristics of the structure is lacking. In this study, this problem is investigated with both numerical modeling and analysis of field measurements. Various sensors were installed on the bridge including thermocouples, strain gauges, and linear differential displacement transducers. Following sensor installation, controlled load testing was conducted and the collected data evaluated against numerical and analytical predictions. The installed sensors will allow for long-term monitoring of the bridge to evaluate the effect of seasonal temperature profiles that are characteristic of
Colorado on bridge behavior. In addition to gaining technical understanding of site-specific bridge characteristics that influence joint movement using field-testing, numerical finite element analysis was conducted. Specifically, a 3D finite element model was developed and used in a parametric study to assess the effect of various parameters on the stresses occurring in the bridge. The stresses occur due to 1) variation in thermal loading and thermal gradient, 2) clogging of the joint with different materials including gravel and sand, and 3) employment of various repair techniques in eliminating the expansion joints. The results of the numerical models show that clogged joints induce some localized stress but do not significantly affect the global performance of the superstructure. The results also show that a reduction in moment demand on the superstructure is not apparent until a Full-Moment Splice connection is utilized. This study will help engineers to choose the most appropriate method of designing a retrofit for expansion joint removal.
Advisors/Committee Members: Mahmoud, Hussam (advisor), Atadero, Rebecca (advisor), Strong, Kelly (committee member).
Subjects/Keywords: expansion joint; plate girder; thermal; finite element model; bridges; retrofit
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Rager, K. (2016). Joint elimination retrofits and thermal loading analysis in plate girder bridge using health monitoring and finite element simulations. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/176597
Chicago Manual of Style (16th Edition):
Rager, Karly. “Joint elimination retrofits and thermal loading analysis in plate girder bridge using health monitoring and finite element simulations.” 2016. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/176597.
MLA Handbook (7th Edition):
Rager, Karly. “Joint elimination retrofits and thermal loading analysis in plate girder bridge using health monitoring and finite element simulations.” 2016. Web. 05 Mar 2021.
Vancouver:
Rager K. Joint elimination retrofits and thermal loading analysis in plate girder bridge using health monitoring and finite element simulations. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/176597.
Council of Science Editors:
Rager K. Joint elimination retrofits and thermal loading analysis in plate girder bridge using health monitoring and finite element simulations. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/176597

Colorado State University
13.
Qin, Chao.
Collapse simulations of steel buildings under fire.
Degree: MS(M.S.), Civil and Environmental Engineering, 2016, Colorado State University
URL: http://hdl.handle.net/10217/176685
► Collapse analysis of steel structures under extreme hazards has been placed on the forefront of research in recent decades. This was primarily motivated by the…
(more)
▼ Collapse analysis of steel structures under extreme hazards has been placed on the forefront of research in recent decades. This was primarily motivated by the September 11, 2001, terrorist attacks, which caused the complete collapse of the World Trade Centers (WTCs) including WTC-7. The collapse, attributed mainly to fires resulting from the attacks, raised concerns regarding the level of robustness in steel frames when subjected to fire loadings. While complete collapse of steel buildings under elevated temperature is considered a rare event, as no cases have been reported prior to 9/11, understanding collapse mechanisms of steel buildings under fire conditions can help in developing methods by which future failures can be avoided. One of the main limitations towards evaluating such collapse events is the experimental cost and complexity associated with conducting collapse tests. Numerical simulations, if properly employed, can yield significant dividends in understanding and quantifying structural response under extreme hazards. With the worldwide move toward performance-based engineering, understanding, and quantifying system behavior through advanced numerical simulations, especially during the heating and cooling phases of realistic fire exposures, is essential for establishing proper performance-based provisions for fire engineering that ensure both safe and economical design. To that end, the primary objectives of this research are two folds - 1) to develop a numerical tool that would allow for the evaluation of steel frames under fire loading, or any extreme hazard for that matter, up to and including collapse and 2) to evaluate the demand on steel frames, employing moment frames, braced frames, and gravity frames, under different fire scenarios. These two overarching objectives were realized through the development of advanced numerical models of two 6-story steel-frame buildings with moment frames, gravity frames, and different center bracing systems (one model utilized a concentrically braced frame while the other utilized eccentrically braced frame). The building structures were subjected to two different time-temperature curves and two different fire scenarios. Specifically, the ASTM E119 standard fire curve and the Eurocode 3 parametric fire curve were selected to simulate the fire loadings and were applied independently to the building models under two different contained fire scenarios. The two scenarios included - 1) first floor corner compartment fire and 2) whole first floor fire. This allowed for the assessment of different global system response where collapse is triggered by twist of the entire structure accompanied by lateral deformation in the case of a corner compartment fire and progressive vertical displacement of the entire system in the case of the whole first floor fire. The simulation results of this study show that structural response of steel buildings including collapse mechanism and behavior of structural members and connections during fire events can be predicted with reasonable…
Advisors/Committee Members: Mahmoud, Hussam (advisor), Atadero, Rebecca (committee member), Kirkpatrick, Allan (committee member).
Subjects/Keywords: collapse; steel buildings; fire; brace frames
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Qin, C. (2016). Collapse simulations of steel buildings under fire. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/176685
Chicago Manual of Style (16th Edition):
Qin, Chao. “Collapse simulations of steel buildings under fire.” 2016. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/176685.
MLA Handbook (7th Edition):
Qin, Chao. “Collapse simulations of steel buildings under fire.” 2016. Web. 05 Mar 2021.
Vancouver:
Qin C. Collapse simulations of steel buildings under fire. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/176685.
Council of Science Editors:
Qin C. Collapse simulations of steel buildings under fire. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/176685

Colorado State University
14.
Bright, Christopher.
Evaluation of new reactive FRP reinforcement assemblies for reinforced concrete transportation structures.
Degree: MS(M.S.), Civil and Environmental Engineering, 2014, Colorado State University
URL: http://hdl.handle.net/10217/83905
► This thesis evaluates two new glass-fiber reinforced polymer concrete reinforcement systems which have been designed to serve as a non-corrosive alternative to steel reinforcement in…
(more)
▼ This thesis evaluates two new glass-fiber reinforced polymer concrete reinforcement systems which have been designed to serve as a non-corrosive alternative to steel reinforcement in reinforced concrete bridge girders. Due to the nature of the reinforcement geometry, these systems react in a way to introduce compressive confinement into the concrete in the inner regions of the system units. The introduction of this compressive confinement zone will increase particle interaction effects which results in increased shear and tensile force resistance contributed by the affected concrete. The system is also well integrated into the surrounding concrete matrix, therefore eliminating the potential for debonding failures. A proof of concept is conducted in order to evaluate a set of alternative reinforcement system prototypes. Before the reinforcement systems are evaluated, technical literature pertaining to alternative reinforcements is reviewed. Select specimens provided evidence of sufficient mechanically constrictive behavior. Indications of good bond strength and shear strength contribution from the flexural reinforcement systems were also found. Parameters which control the structural behavior of the reinforcement system were identified.
Advisors/Committee Members: van de Lindt, John W. (advisor), Atadero, Rebecca (advisor), Radford, Donald (committee member).
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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APA (6th Edition):
Bright, C. (2014). Evaluation of new reactive FRP reinforcement assemblies for reinforced concrete transportation structures. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/83905
Chicago Manual of Style (16th Edition):
Bright, Christopher. “Evaluation of new reactive FRP reinforcement assemblies for reinforced concrete transportation structures.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/83905.
MLA Handbook (7th Edition):
Bright, Christopher. “Evaluation of new reactive FRP reinforcement assemblies for reinforced concrete transportation structures.” 2014. Web. 05 Mar 2021.
Vancouver:
Bright C. Evaluation of new reactive FRP reinforcement assemblies for reinforced concrete transportation structures. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/83905.
Council of Science Editors:
Bright C. Evaluation of new reactive FRP reinforcement assemblies for reinforced concrete transportation structures. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/83905

Colorado State University
15.
Hesse, Alex.
Using expert opinion to quantify accuracy and reliability of nondestructive evaluation on bridges.
Degree: MS(M.S.), Civil and Environmental Engineering, 2013, Colorado State University
URL: http://hdl.handle.net/10217/79063
► Bridge inspection is an important phase in the bridge management process. In 2009, a joint American Society of Civil Engineers Structural Engineering Institute (ASCE/SEI) and…
(more)
▼ Bridge inspection is an important phase in the bridge management process. In 2009, a joint American Society of Civil Engineers Structural Engineering Institute (ASCE/SEI) and AASHTO Ad-Hoc group was created to identify the issues to guarantee bridge safety and to study how current bridge practices could be improved for the future. This group recommended: "A more rational, risk-based approach to determining the appropriate inspection intervals for bridges is needed, as opposed to a set twenty-four month cycle for all bridges". The committee also recommended a wider use of NDE methods. The difficulty in increasing the use of these NDE methods is the increased costs and time spent using them. One way to deal with this is to implement risk based planning to determine the appropriate inspection frequency, scope, intensity, and methodology. To do this, though, the accuracy, reliability, bias, and cost of each test must be quantified. This study attempts to quantify these parameters for common bridge NDE methods. This was done by two methods. Firstly, a literature review was performed to determine common NDE methods being used and studied for bridge inspection and statistical data was found for these methods. To complement the literature, a four round Delphi method survey was conducted with experts in the NDE bridge field in order to develop a broader range of data that matches real life practices. All of the data was then analyzed and conclusions were drawn to quantify the accuracy, reliability, bias, and various costs incurred for common bridge NDE methods. Based on these results it can be seen that most commonly used bridge NDE methods tend to be under biased and relatively repeatable. It was shown, however, that while inspectors seem to have a pretty good relative understanding of the variability in different tests, they tend to not have as clear of an understanding of the absolute scale of the variability. Furthermore, the accuracy of commonly used bridge NDE methods tends to be relatively variable with the average test measuring a true response between 80% and 85% of the time. Lastly the costs associated with the NDE methods examined here tended to be highly variable making this measure difficult to evaluate. However, by comparing the rankings of each of the four categories that were examined for each NDE method, it is possible to correlate the cost of a method to the bias, accuracy and reliability. This could lead to a more reliable risk-based approach to bridge inspection in the future.
Advisors/Committee Members: Atadero, Rebecca (advisor), Ozbek, Mehmet (advisor), Chen, Suren (committee member), Nobe, Mary (committee member).
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hesse, A. (2013). Using expert opinion to quantify accuracy and reliability of nondestructive evaluation on bridges. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/79063
Chicago Manual of Style (16th Edition):
Hesse, Alex. “Using expert opinion to quantify accuracy and reliability of nondestructive evaluation on bridges.” 2013. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/79063.
MLA Handbook (7th Edition):
Hesse, Alex. “Using expert opinion to quantify accuracy and reliability of nondestructive evaluation on bridges.” 2013. Web. 05 Mar 2021.
Vancouver:
Hesse A. Using expert opinion to quantify accuracy and reliability of nondestructive evaluation on bridges. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/79063.
Council of Science Editors:
Hesse A. Using expert opinion to quantify accuracy and reliability of nondestructive evaluation on bridges. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/79063

Colorado State University
16.
Simpson, Sherona Patrice.
Framework for assessing transportation sustainability rating systems for implementation in U.S. state departments of transportation, A.
Degree: MS(M.S.), Construction Management, 2013, Colorado State University
URL: http://hdl.handle.net/10217/81080
► Sustainability has increased in popularity as a key indicator for planning transportation projects. With that movement, evaluating the sustainability of transportation projects has become necessary…
(more)
▼ Sustainability has increased in popularity as a key indicator for planning transportation projects. With that movement, evaluating the sustainability of transportation projects has become necessary for
state departments of transportation (DOTs). Transportation Sustainability Rating Systems (TSRS) have been adopted for this purpose; however, different TSRSs employ different methods for determining or quantifying sustainability, and emphasize different sustainability factors. Given the number, variability, and specificity of TSRSs available, an evaluation and pairing exercise of available systems is needed to help the
state DOTs select a system by determining to what extent a given system suits the
state DOT's preferences. This thesis presents a four step framework which identifies the most important capabilities in a TSRS as preferred by a
state DOT and then facilitates weighting of those capabilities via a well-established methodology, the Analytical Hierarchy Process. The thesis also presents the implementation of this framework for
Colorado DOT (CDOT), South Dakota DOT (SDDOT), Utah DOT (UDOT) and Wyoming DOT (WYDOT). The framework resulted in the identification of INVEST to be the most suitable TSRS for CDOT and WYDOT, GreenLITES as the most suitable TSRS for SDDOT and the results for UDOT were inconclusive. The framework developed for assessing TSRSs was proven to be a viable means for determining rank and suitability of TSRS for DOTs.
Advisors/Committee Members: Clevenger, Caroline M. (advisor), Ozbek, Mehmet E. (advisor), Atadero, Rebecca A. (committee member).
Subjects/Keywords: transportation; climate change; sustainability; transportation sustainability; sustainability rating systems
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Simpson, S. P. (2013). Framework for assessing transportation sustainability rating systems for implementation in U.S. state departments of transportation, A. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/81080
Chicago Manual of Style (16th Edition):
Simpson, Sherona Patrice. “Framework for assessing transportation sustainability rating systems for implementation in U.S. state departments of transportation, A.” 2013. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/81080.
MLA Handbook (7th Edition):
Simpson, Sherona Patrice. “Framework for assessing transportation sustainability rating systems for implementation in U.S. state departments of transportation, A.” 2013. Web. 05 Mar 2021.
Vancouver:
Simpson SP. Framework for assessing transportation sustainability rating systems for implementation in U.S. state departments of transportation, A. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/81080.
Council of Science Editors:
Simpson SP. Framework for assessing transportation sustainability rating systems for implementation in U.S. state departments of transportation, A. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/81080

Colorado State University
17.
Allen, Douglas Gregory.
Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures.
Degree: MS(M.S.), Civil and Environmental Engineering, 2011, Colorado State University
URL: http://hdl.handle.net/10217/70662
► Fiber Reinforced Polymer Composites (FRP) are an attractive repair option for reinforced concrete structures, however their long term performance in field environments is not well…
(more)
▼ Fiber Reinforced Polymer Composites (FRP) are an attractive repair option for reinforced concrete structures, however their long term performance in field environments is not well understood. Laboratory durability tests have indicated that FRP generally performs quite well, but these laboratory tests cannot model the synergistic effects that occur when the FRP is in-service on a bridge (or other structure). Field assessments of FRP properties are very rare in the literature. This thesis describes an effort to collect in-situ data about a FRP repaired concrete arch bridge. The Castlewood Canyon Bridge on
Colorado state highway 83 was reconstructed in 2003. The reconstruction included replacement of the deck and spandrel columns and repair of the existing concrete arches with externally bonded FRP. The FRP had been in service for 8 years when its condition was assessed for this project. Assessment efforts started with collection of as much information as possible about the materials and techniques used for repair. Unfortunately only limited amounts of initial or baseline data were recovered. Based on available information a tentative plan for site assessment activities was prepared, including testing locations at the base and crest of the arch. The field assessment of the bridge was completed on location during July, 2011. The complete extrados of the east arch was inspected for voids between the concrete and FRP using acoustic sounding and thermalgraphic imaging. Voids that were previously identified during a routine bridge inspection in 2007 had grown significantly larger by the 2011 assessment. Pull-off tests were used to test the bond strength at the base and top of the arch. Pull-off strengths were on average lower and represented different failure modes from pull-off tests conducted at the time of repair. Large debonded regions of FRP were cut from the structure to use in laboratory testing. Damaged regions were repaired with new FRP. Materials brought back from the bridge were used for tensile and Differential Scanning Calorimetry (DSC) testing. The tensile tests showed that the FRP strength was well below the specified design strength, but the lack of initial data makes it difficult to tell if the material has deteriorated over time, or if the material started off with lower strengths due to field manufacture techniques. The DSC tests showed that the glass transition temperature of the composites was near the value suggested by the manufacturer. The field assessment was used as a case study in collecting durability data about FRP. From this case study numerous recommendations are made to improve the available information about the durability of FRP repairs in field environments. A specific process to be followed in collecting this data is also proposed.
Advisors/Committee Members: Atadero, Rebecca (advisor), Heyliger, Paul R. (committee member), Radford, Don (committee member).
Subjects/Keywords: assessment; durability; evaluation; field; FRP; long-term
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APA ·
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APA (6th Edition):
Allen, D. G. (2011). Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/70662
Chicago Manual of Style (16th Edition):
Allen, Douglas Gregory. “Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures.” 2011. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/70662.
MLA Handbook (7th Edition):
Allen, Douglas Gregory. “Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures.” 2011. Web. 05 Mar 2021.
Vancouver:
Allen DG. Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures. [Internet] [Masters thesis]. Colorado State University; 2011. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/70662.
Council of Science Editors:
Allen DG. Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures. [Masters Thesis]. Colorado State University; 2011. Available from: http://hdl.handle.net/10217/70662

Colorado State University
18.
Sinha, Akanksha.
Development of a framework to determine the relative weights of contextual factors for complex highway projects.
Degree: MS(M.S.), Construction Management, 2017, Colorado State University
URL: http://hdl.handle.net/10217/184011
► Traditional project management strategies for highway projects originated with the advent of new construction during the 1950s and 1960s focusing on three dimensions of complexity…
(more)
▼ Traditional project management strategies for highway projects originated with the advent of new construction during the 1950s and 1960s focusing on three dimensions of complexity i.e. cost, schedule and technical (scope). But recently with the major focus shifting towards reconstruction/ rehabilitation projects, the project management strategies also need to shift to include other dimensions rather than perceiving them as risks. A paper by Winter and Smith (2006), "Rethinking Project Management", introduced five new directions to consider while preparing a risk management strategy for complex projects. Following this, a research was conducted by the Second Strategic Highway Research Program, R-10, to study the factors that impact the construction of complex highway projects. The primary outcome of the R-10 study was a five-dimensional approach to project management planning (5DPM) that adds context and financing as two new dimensions to the traditional dimensions of cost, schedule, and technical. Experience during the pilot testing of the 5DPM implementation suggested that the most complicated dimension to assess during the project management planning phase for a complex project is the context dimension which refers to the external factors that have an impact on the project and are difficult to predict and plan for before the start of the project. Currently there is no structured process for evaluating these factors and they are mostly perceived as risks. The R-10 research team identified 8 factor categories which are: stakeholders, project-specific demands, resource availability, environmental, legal and legislative requirements, global and national events, unusual conditions and localized issues and 26 factors under these categories which can cause complexity. The research developed a framework to identify the contextual factors relevant to each specific project and determine the relative weights of these contextual factors using a well-structured approach, the Analytical Hierarchy Process (AHP). Two complex projects within the
state of
Colorado, U.S. 34 Rebuild and I-25 North Expansion project, were chosen to illustrate the implementation of the developed framework. The primary reason for selecting AHP method was the requirement of pairwise comparison of intangibles derived through the judgement of the experts in a structured mathematical method. The Group AHP was further performed to develop the overall ranking of the contextual factors as a group. The major finding of this study was that as a group, the US 34 Rebuild team valued procedural laws and land acquisition as the most important factor followed by work-zone visualization and marketing and public relations. For the I-25 team, the most important factor was procedural laws followed by limitations and constraints and project management capabilities. The most striking difference between the factor weights for both the projects was that the weights were more evenly distributed between factors for US-34, whereas for I-25, few factors had very high weights…
Advisors/Committee Members: Ozbek, Mehmet E. (advisor), Strong, Kelly C. (committee member), Atadero, Rebecca (committee member).
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sinha, A. (2017). Development of a framework to determine the relative weights of contextual factors for complex highway projects. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/184011
Chicago Manual of Style (16th Edition):
Sinha, Akanksha. “Development of a framework to determine the relative weights of contextual factors for complex highway projects.” 2017. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/184011.
MLA Handbook (7th Edition):
Sinha, Akanksha. “Development of a framework to determine the relative weights of contextual factors for complex highway projects.” 2017. Web. 05 Mar 2021.
Vancouver:
Sinha A. Development of a framework to determine the relative weights of contextual factors for complex highway projects. [Internet] [Masters thesis]. Colorado State University; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/184011.
Council of Science Editors:
Sinha A. Development of a framework to determine the relative weights of contextual factors for complex highway projects. [Masters Thesis]. Colorado State University; 2017. Available from: http://hdl.handle.net/10217/184011

Colorado State University
19.
Johnson, Joshua F.
Determining the items that structure bridge management components and their relative weights.
Degree: MS(M.S.), Construction Management, 2012, Colorado State University
URL: http://hdl.handle.net/10217/65323
► Ensuring the optimal allocation of available resources between competing bridges is difficult, especially when considering a combination of factors such as continual age related deterioration,…
(more)
▼ Ensuring the optimal allocation of available resources between competing bridges is difficult, especially when considering a combination of factors such as continual age related deterioration, ever-increasing traffic demands, and limited resources to address preservation and improvement needs. Optimally allocating funding is crucial since bridges are an essential and expensive component of transportation networks. Bridge Management Systems (BMSs) are commonly used tools that aid managers and decision makers in establishing methods for optimizing available resources and determining how to distribute funds between competing bridges. Recently, NCHRP Synthesis 397 Bridge Management Systems for Transportation Agency Decision Making investigated how transportation agencies are using BMSs and the current
state of bridge management practices. The report identified concerns of inadequacy and ineffectiveness with bridge management practices that base decisions solely on single value assessments such as Pontis' Bridge Health Index or the Sufficiency Rating, as found in the federally mandated National Bridge Inspection Standards. Given the critiques in the NCHRP report and other literature related to bridge management, it is evident there exists a need to pursue and develop alternative bridge management practices and systems. The overall purpose of this research is to investigate the concept of isolating the items used to make up a single rating or index in an effort to categorize them under distinct bridge management components such as structural condition, impact on public, and hazard resistance. Each bridge management component has a defined objective as follows: • Structural Condition - accurately access the structural adequacy of a bridge. • Impact on Public - evaluate how bridge attributes affect the traveling public. • Hazard Resistance - evaluate how bridge attributes and external factors affect the vulnerability of a bridge concerning the probability of an extreme event as well as the probability of failure during that event. The specific objectives of this research are (i) to identify the appropriate items that make up each of the aforementioned components and (ii) to determine the relative importance of those items as represented by weighting factors. To achieve these objectives, the researcher conducted a two-part survey seeking input from key bridge management personnel from
State DOTs, the Federal Highway Administration (FHWA), and other industry professionals and experts. The first part of the survey identified the appropriate items and the second part determined the relative importance of those items using a mathematical method called the Analytic Hierarchy Process (AHP). The primary contribution of this research is to provide bridge management engineers and decision-makers with effective bridge management components, with well-defined objectives and related items, which clearly identify and distinguish differences in bridge attributes that may go unnoticed when using a single rating or index. This will…
Advisors/Committee Members: Ozbek, Mehmet Egemen (advisor), Clevenger, Caroline (committee member), Atadero, Rebecca (committee member), Chen, Suren (committee member).
Subjects/Keywords: analytic hierarchy process; bridges; decision-making; multi-objective; optimization; preservation
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Johnson, J. F. (2012). Determining the items that structure bridge management components and their relative weights. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/65323
Chicago Manual of Style (16th Edition):
Johnson, Joshua F. “Determining the items that structure bridge management components and their relative weights.” 2012. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/65323.
MLA Handbook (7th Edition):
Johnson, Joshua F. “Determining the items that structure bridge management components and their relative weights.” 2012. Web. 05 Mar 2021.
Vancouver:
Johnson JF. Determining the items that structure bridge management components and their relative weights. [Internet] [Masters thesis]. Colorado State University; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/65323.
Council of Science Editors:
Johnson JF. Determining the items that structure bridge management components and their relative weights. [Masters Thesis]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/65323

Colorado State University
20.
Albeiruti, Nasser T.
Understanding public perceptions of different options to fund the highway system.
Degree: MS(M.S.), Construction Management, 2014, Colorado State University
URL: http://hdl.handle.net/10217/88497
► The purpose of this research was to generate an understanding of the public perceptions of different revenue generation systems that are already in use or…
(more)
▼ The purpose of this research was to generate an understanding of the public perceptions of different revenue generation systems that are already in use or that have the potential to be used in the future, and to educate the public on the different revenue generation systems. In addition, this study tested a number of hypotheses that were focused on finding relationships (correlations) between the choice of funding option to support the highway system in the United States and the demographic information. A survey method was used to explore this topic. The survey instrument was sent to 15,945 people representing five states:
Colorado, North Dakota, South Dakota, Utah, and Wyoming (Mountain-Plains Consortium states) via mail. Only 1,190 surveys were received, 27 were eliminated due to various issues, and 1,163 were posted as completed surveys resulting in a response rate of 7.30 %. Data analysis of the results consisted of performing descriptive and inferential statistics and running chi-square tests for correlation analysis. The results of this survey indicate that the public in the states of
Colorado, North Dakota, South Dakota, Utah, and Wyoming selected "increasing the federal gas tax that is collected at the time of purchase" as their first choice of funding option. The support for the use of highway tolling to fund the highway system was somewhat moderate among the population across the five states. The collection of additional sales tax on all goods to fund the highway system was unpopular funding mechanism among the population in the five states. Similarly, the support for the use of mileage-based user fees was disliked among the population in the five states. This research is significant, as few studies have been done on understanding the public perceptions of different options to fund the highway systems. Furthermore the findings of this survey could be used by the law-makers in the five states under study to make better decisions with respect to the alternative options of funding the highway system in their
state based on the general public's perceptions in the
state. Future research could be aimed to study the impact of the utilized option on each
state with regard to its social, economic, and behavioral issues that could result from its implementation.
Advisors/Committee Members: Ozbek, Mehmet E. (advisor), Senior, Bolivar A. (committee member), Atadero, Rebecca A. (committee member).
Subjects/Keywords: alternatives; fuel tax; fundings; highway; tolling; transportation
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Albeiruti, N. T. (2014). Understanding public perceptions of different options to fund the highway system. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/88497
Chicago Manual of Style (16th Edition):
Albeiruti, Nasser T. “Understanding public perceptions of different options to fund the highway system.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/88497.
MLA Handbook (7th Edition):
Albeiruti, Nasser T. “Understanding public perceptions of different options to fund the highway system.” 2014. Web. 05 Mar 2021.
Vancouver:
Albeiruti NT. Understanding public perceptions of different options to fund the highway system. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/88497.
Council of Science Editors:
Albeiruti NT. Understanding public perceptions of different options to fund the highway system. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/88497

Colorado State University
21.
Zamora, José Efraín Mazariegos.
Seismic fragility analysis of reinforced masonry buildings.
Degree: MS(M.S.), Civil and Environmental Engineering, 2013, Colorado State University
URL: http://hdl.handle.net/10217/80269
► Reinforced masonry walls are a widely used lateral force resisting system for buildings around the world. These structures, if not correctly detailed to resist earthquake…
(more)
▼ Reinforced masonry walls are a widely used lateral force resisting system for buildings around the world. These structures, if not correctly detailed to resist earthquake loads, are a main cause of casualties and economic losses, particularly in developing countries. This thesis presents the result of a study whose objective was to apply the seismic fragility methodology to both in-plane (shear) and out-of-plane (transverse) reinforced masonry shear walls to quantify probabilities of exceedance for ASCE 41-06 drifts associated with continued occupancy, life safety, and collapse prevention, performance states. The load-displacement curves (hysteresis) were obtained from quasi-static out-of-plane and in-plane experimental testing by Klingner et al. (2010). In this thesis, that data was applied to obtain the parameters for a widely used ten-parameter hysteretic model. The software SAPWood Version 2.0 was selected for use in this thesis to enable nonlinear modeling of the shear wall and out-of-plane components. An analytical model of the reinforced masonry walls was developed in SAPWood and subjected to each earthquake within a well-known suite of 22 earthquakes. The peak of drifts for each ground motion record was recorded and each earthquake intensity increased over the range interest, i.e. an incremental dynamic analysis (IDA) was performed. Finally, as mentioned the information obtained from the IDA was used to develop fragility curves for the in-plane and out-of-plane walls based on peak story drift limits defined in ASCE 41 for continued occupancy, life safety, and collapse prevention.
Advisors/Committee Members: van de Lindt, John W. (advisor), Atadero, Rebecca (committee member), Strong, Kelly (committee member).
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zamora, J. E. M. (2013). Seismic fragility analysis of reinforced masonry buildings. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/80269
Chicago Manual of Style (16th Edition):
Zamora, José Efraín Mazariegos. “Seismic fragility analysis of reinforced masonry buildings.” 2013. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/80269.
MLA Handbook (7th Edition):
Zamora, José Efraín Mazariegos. “Seismic fragility analysis of reinforced masonry buildings.” 2013. Web. 05 Mar 2021.
Vancouver:
Zamora JEM. Seismic fragility analysis of reinforced masonry buildings. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/80269.
Council of Science Editors:
Zamora JEM. Seismic fragility analysis of reinforced masonry buildings. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/80269

Colorado State University
22.
McGuire, Brendan Michael.
Using building information modeling to track and assess the structural condition of bridges.
Degree: MS(M.S.), Civil and Environmental Engineering, 2014, Colorado State University
URL: http://hdl.handle.net/10217/88574
► National Bridge Inspection Standards do not require documenting damage location during an inspection but bridge evaluation provisions highlight the importance of it. When determining a…
(more)
▼ National Bridge Inspection Standards do not require documenting damage location during an inspection but bridge evaluation provisions highlight the importance of it. When determining a safe load carrying capacity of a bridge, damage location information is significant because shear and moment limit states are more critical at different locations and member capacities can vary along the length of a span. Capturing damage location information using current methods can be impractical; however, building information modeling (BIM) provides new opportunities in tracking and utilizing this information. A method and prototype implementation to apply BIM software to the operation and maintenance stages of bridges' service lives is presented. The proposed Bridge information modeling for Inspection and Evaluation Method (BIEM) could allow transportation agencies to more efficiently manage bridge inventories using BIM capabilities while incorporating damage location information. The method, created by the author, uses BIM to document damage type, amount, severity, and location information during a bridge inspection. To leverage this information, inspection results are exported from the BIM model into a spreadsheet where a custom subroutine evaluates the structural performance and performs load ratings on selected bridge superstructure elements. In addition, based on the type, amount, and severity of damage, estimated repair quantities are given and maintenance recommendations are provided. The proposed method was field tested on a case study bridge in Larimer County,
Colorado. Official inspection reports and load ratings were obtained and a visual inspection of the bridge utilizing supplemental location-based measurements was performed. The BIEM was implemented and numerical results were compared to the official load ratings. Results suggest that documenting the location of deterioration within a bridge element can affect the guidelines for determining a safe load carrying capacity for a bridge. In addition, the opportunity exists for BIM to play a significant role in bridge management in the future as demonstrated by its proven ability to facilitate the inspection and evaluation processes which could ultimately result in more automated practices. Overall, results from this research motivate future work in the study of deterioration modes and their effect on bridge element capacity and tailoring the principles BIM to the later stages of bridges' service lives.
Advisors/Committee Members: Atadero, Rebecca (advisor), Clevenger, Caroline (advisor), Ozbek, Mehmet (committee member), Elliott, Jonathan (committee member).
Subjects/Keywords: BIM; bridge information modeling; bridge inspection; BrIM; building information modeling; management systems
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
McGuire, B. M. (2014). Using building information modeling to track and assess the structural condition of bridges. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/88574
Chicago Manual of Style (16th Edition):
McGuire, Brendan Michael. “Using building information modeling to track and assess the structural condition of bridges.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/88574.
MLA Handbook (7th Edition):
McGuire, Brendan Michael. “Using building information modeling to track and assess the structural condition of bridges.” 2014. Web. 05 Mar 2021.
Vancouver:
McGuire BM. Using building information modeling to track and assess the structural condition of bridges. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/88574.
Council of Science Editors:
McGuire BM. Using building information modeling to track and assess the structural condition of bridges. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/88574

Colorado State University
23.
Lewis, Anderson M.
Perceived value of using BIM for energy simulation, The.
Degree: MS(M.S.), Construction Management, 2014, Colorado State University
URL: http://hdl.handle.net/10217/83988
► Building Information Modeling (BIM) is becoming an increasingly important tool in the Architectural, Engineering & Construction (AEC) industries. Some of the benefits associated with BIM…
(more)
▼ Building Information Modeling (BIM) is becoming an increasingly important tool in the Architectural, Engineering & Construction (AEC) industries. Some of the benefits associated with BIM include but are not limited to cost and time savings through greater trade and design coordination, and more accurate estimating take-offs. BIM is a virtual 3D, parametric design software that allows users to store information of a model within and can be used as a communication platform between project stakeholders. Likewise, energy simulation is an integral tool for predicting and optimizing a building's performance during design. Creating energy models and running energy simulations can be a time consuming activity due to the large number of parameters and assumptions that must be addressed to achieve reasonably accurate results. However, leveraging information imbedded within Building Information Models (BIMs) has the potential to increase accuracy and reduce the amount of time required to run energy simulations and can facilitate continuous energy simulations throughout the design process, thus optimizing building performance. Although some literature exists on how design stakeholders perceive the benefits associated with leveraging BIM for energy simulation, little is known about how perceptions associated with leveraging BIM for energy simulation differ between various green design stakeholder user groups. Through an e-survey instrument, this study seeks to determine how perceptions of using BIMs to inform energy simulation differ among distinct design stakeholder groups, which include BIM-only users, energy simulation-only users and BIM and energy simulation users. Additionally, this study seeks to determine what design stakeholders perceive as the main barriers and benefits of implementing BIM-based energy simulation. Results from this study suggest that little to no correlation exists between green design stakeholders' perceptions of the value associated with using information from BIMs to inform energy simulation and their engagement level with BIM and/or energy simulation. However, green design stakeholder perceptions of the value associated with using information from BIMs to inform energy simulation and their engagement with BIM and/or energy simulation may differ between different user groups (i.e. BIM users only, energy simulation users only, and BIM and energy simulation users). For example, the BIM-only user groups appeared to have a strong positive correlation between the perceptions of the value associated with using information from BIMs to inform energy simulation and their engagement with BIM. Additionally, this study suggests that the top perceived benefits of using BIMs to inform energy simulations among green design stakeholders are: facilitation of communication, reducing of process related costs, and giving users the ability examine more design options. The main perceived barrier of using BIMs to inform energy simulations among green design stakeholders was a lack of BIM standards for model…
Advisors/Committee Members: Valdes-Vasquez, Rodolfo (advisor), Clevenger, Caroline (committee member), Atadero, Rebecca (committee member).
Subjects/Keywords: analysis; perceptions; energy simulation; energy modeling; BIM
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lewis, A. M. (2014). Perceived value of using BIM for energy simulation, The. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/83988
Chicago Manual of Style (16th Edition):
Lewis, Anderson M. “Perceived value of using BIM for energy simulation, The.” 2014. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/83988.
MLA Handbook (7th Edition):
Lewis, Anderson M. “Perceived value of using BIM for energy simulation, The.” 2014. Web. 05 Mar 2021.
Vancouver:
Lewis AM. Perceived value of using BIM for energy simulation, The. [Internet] [Masters thesis]. Colorado State University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/83988.
Council of Science Editors:
Lewis AM. Perceived value of using BIM for energy simulation, The. [Masters Thesis]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/83988

Colorado State University
24.
Akalp, Duygu.
Bid or no bid decision making tool using analytic hierarchy process.
Degree: MS(M.S.), Construction Management, 2016, Colorado State University
URL: http://hdl.handle.net/10217/178833
► In today's competitive business environment, every construction company confronts a decision-making dilemma and must decide whether to bid or not bid on a project(s) or…
(more)
▼ In today's competitive business environment, every construction company confronts a decision-making dilemma and must decide whether to bid or not bid on a project(s) or which project(s) to bid on among candidates. Even though the decision-makers come to the conclusion with different judgments, a final evaluation always requires putting different factors into consideration and contemplating the ups and downs of a project. Therefore, bid or no bid decision is complex and crucial for construction companies. The complexity comes from the consideration of many intangible and tangible factors in the decision-making process (Mohanty 1992). Decision-making is hard because it requires a decision-maker to construct a structured thinking to include many unknown, yet complex variables and compare them simultaneously. Decision-making is crucial because poorly made bidding decisions could cause severe and irrevocable problems. For example, not bidding a favorable project could result in lost opportunities for companies to make profit, improve contractor's strength in the industry and gain a long-term relationship with a new client. On the other hand, bidding a project that actually does not fit the company's profile requires a lot of time, effort, and commitment without a favorable outcome (Ahmad 1990, Wanous et al. 2003). Given that "competitive bidding" is the most common bidding method in the construction industry among others (e.g., negotiated contracts, package deals, private finance initiative), investigating bidding strategies has been a focal point by researchers (Harris et al. 2006). Furthermore, more than 100 key factors that influence bidding decisions have been determined to date since the mid-1950s. Simultaneously, to expedite the process, numerous decision-making models have been proposed. Despite the excessive availability of the factors and decision-making models, the facilitation rate of the subsidiary tools in the evaluation process in the construction industry is very little. According to a survey by Ahmad & Minkarah (1988), only 11.1 percent of the construction companies use a decision making tool in order to come to a bid or not bid conclusion in the United States. The ultimate purpose of this study is to develop a practical decision-making tool to assist decision makers in the construction industry to select the most appropriate projects to bid on using Analytic Hierarchy Process (AHP). Based on the collected demographic information (e.g., sector, size, type), the combined importance weights of the construction professionals are also presented in the study. Finally, the statistically significant differences between different groups of construction companies in how much weight they assign to a given bid/no bid decision factor is investigated. In reaching the abovementioned purpose, the following questions are addressed: • What are the most common key factors that influence bid/no bid decisions? • How can different judgments from different decision-makers be combined into one final decision? • How…
Advisors/Committee Members: Ozbek, Mehmet E. (advisor), Senior, Bolivar (committee member), Atadero, Rebecca A. (committee member).
Subjects/Keywords: analytic hierarchy process; key factors; AHP; multi criteria decision-making; bidding
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Akalp, D. (2016). Bid or no bid decision making tool using analytic hierarchy process. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/178833
Chicago Manual of Style (16th Edition):
Akalp, Duygu. “Bid or no bid decision making tool using analytic hierarchy process.” 2016. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/178833.
MLA Handbook (7th Edition):
Akalp, Duygu. “Bid or no bid decision making tool using analytic hierarchy process.” 2016. Web. 05 Mar 2021.
Vancouver:
Akalp D. Bid or no bid decision making tool using analytic hierarchy process. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/178833.
Council of Science Editors:
Akalp D. Bid or no bid decision making tool using analytic hierarchy process. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/178833

Colorado State University
25.
Turner, David.
Fragility assessment of bridge superstructures under hydrodynamic forces.
Degree: MS(M.S.), Civil and Environmental Engineering, 2015, Colorado State University
URL: http://hdl.handle.net/10217/170400
► On September 11-17, 2013, Colorado suffered devastating and widespread flash flooding which spread 150 miles, from Colorado Springs north to Fort Collins impacting 24 counties.…
(more)
▼ On September 11-17, 2013,
Colorado suffered devastating and widespread flash flooding which spread 150 miles, from
Colorado Springs north to Fort Collins impacting 24 counties. The flood damaged several bridges as well as over 400 miles of
state roads. As a result of the transportation damage, residents of Drake,
Colorado were isolated and had to be evacuated via helicopter. This thesis aims to determine the failure risk associated with the inundation of bridge superstructures. A linear network of eight bridges near Drake,
Colorado is selected for analysis which includes three unique structural configurations. Flood analysis is performed using the design equations presented by Kerenyi et al. (2009) which follows the same equation format that is listed in AASHTO. Fragilities are developed for the most critical internal and external composite girders for each bridge. The results obtained from fragility analysis are then used to determine the elevation adjustments needed to reach a target beta value of 3.5. Based on the analysis conducted in this thesis, it was found that the forces associated with bridge deck inundation, more specifically, in fast-moving mountain rivers is substantial and needs to be considered in design. Currently, bridge superstructures are designed based on the 100 year flood, which in the case of the bridges in this study, would not have resulted in any inundation of the bridge deck at the time of construction based on the knowledge at that time. To counter this, bridge superstructures should be designed based on the 500 year flood which would incorporate inundation forces in the initial design. The methodology presented in this thesis can be used to assess and improve the flood vulnerability for any communities' bridge network.
Advisors/Committee Members: van de Lindt, John (advisor), Senior, Bolivar (committee member), Atadero, Rebecca (committee member).
Subjects/Keywords: bridge; fragility; hydrodynamic; superstructure
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Chicago ·
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APA (6th Edition):
Turner, D. (2015). Fragility assessment of bridge superstructures under hydrodynamic forces. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/170400
Chicago Manual of Style (16th Edition):
Turner, David. “Fragility assessment of bridge superstructures under hydrodynamic forces.” 2015. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/170400.
MLA Handbook (7th Edition):
Turner, David. “Fragility assessment of bridge superstructures under hydrodynamic forces.” 2015. Web. 05 Mar 2021.
Vancouver:
Turner D. Fragility assessment of bridge superstructures under hydrodynamic forces. [Internet] [Masters thesis]. Colorado State University; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/170400.
Council of Science Editors:
Turner D. Fragility assessment of bridge superstructures under hydrodynamic forces. [Masters Thesis]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/170400

Colorado State University
26.
Oluwalaiye, Oluwatobi Temitope.
Comparative assessment of transportation sustainability rating systems.
Degree: MS(M.S.), Construction Management, 2018, Colorado State University
URL: http://hdl.handle.net/10217/193181
► The construction industry contributes a significant amount of greenhouse gas emissions to the environment. This highlights the need for this industry to implement sustainable practices…
(more)
▼ The construction industry contributes a significant amount of greenhouse gas emissions to the environment. This highlights the need for this industry to implement sustainable practices to mitigate its negative effects. In the transportation sector of the construction industry, several transportation sustainability rating systems (TSRS) have been developed to measure and promote sustainability. However, studies show that these TSRS have not been developed within a consistent "sustainability scope". This raises the question of the consistency of these TSRS in measuring sustainability of transportation projects. This study assessed three prominent TSRS to determine how each measure sustainability with respect to the triple bottom line. The TSRS that are in the scope of this study are: ENVISION – a third-party rating system, INVEST – a self-assessed rating system and, GreenLITES – an in-house developed self-assessed rating system. The results show that these three rating systems assess and reward sustainability practices differently. Additionally, results suggest that it may be easier for a project to get awarded in GreenLITES compared to the other two TSRS. Notwithstanding all the above, a consistency was noted in all three rating systems in the Quality of Life/Social performance of projects. This study helps inform stakeholders in the transportation industry on how transportation projects perform when run through each of these rating systems. This will help stakeholders make informed decisions with respect to choosing one (or more) TSRS to assess their projects with and evaluating the results obtained from such TSRS.
Advisors/Committee Members: Ozbel, Mehmet E. (advisor), Olbina, Svetlana (committee member), Atadero, Rebecca A. (committee member).
Subjects/Keywords: GreenLITES; transportation sustainability rating systems; ENVISION; triple bottom line; INVEST
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oluwalaiye, O. T. (2018). Comparative assessment of transportation sustainability rating systems. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/193181
Chicago Manual of Style (16th Edition):
Oluwalaiye, Oluwatobi Temitope. “Comparative assessment of transportation sustainability rating systems.” 2018. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/193181.
MLA Handbook (7th Edition):
Oluwalaiye, Oluwatobi Temitope. “Comparative assessment of transportation sustainability rating systems.” 2018. Web. 05 Mar 2021.
Vancouver:
Oluwalaiye OT. Comparative assessment of transportation sustainability rating systems. [Internet] [Masters thesis]. Colorado State University; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/193181.
Council of Science Editors:
Oluwalaiye OT. Comparative assessment of transportation sustainability rating systems. [Masters Thesis]. Colorado State University; 2018. Available from: http://hdl.handle.net/10217/193181

Colorado State University
27.
Alnewar, Saurabh.
Life-cycle cost analysis of a bridge in remote mountainous terrain.
Degree: MS(M.S.), Construction Management, 2018, Colorado State University
URL: http://hdl.handle.net/10217/191441
► There are various approaches documented and researched to calculate life cycle cost, yet many researchers and applications fail to incorporate user costs to optimize total…
(more)
▼ There are various approaches documented and researched to calculate life cycle cost, yet many researchers and applications fail to incorporate user costs to optimize total life cycle costs. To perform a holistic bridge life cycle cost analysis, all the cost components are to be considered. The bridge life cycle cost is divided into: agency cost, user cots and environmental costs. The agency cost comprises of acquisition cost, construction cost, maintenance and repair cost, deck replacement cost and debris removal cost. The user cost constitutes vehicle operation cost (VOC), travel delay costs and crash costs. The environmental costs are out of the scope of the study hence are not calculated. In this study, the impact of user cost on total life cycle cost are calculated for a hypothetical bridge failure in remote mountainous terrain based on two alternative detour routes. The study focuses on using a deterministic approach to calculate total bridge life cycle cost with emphasis on user cost. Detailed mathematical calculations are performed using readily available data on bridge characteristic, agency and user cost components. A sensitivity analysis is performed on two detour route alternatives. The selection of the two detour routes is done based on the availability of possible options around the selected bridge. The results from the user cost calculation for the two detour routes and their impact on total life cycle cost are presented in this study along with the total bridge life cycle cost.
Advisors/Committee Members: Strong, Kelly C. (advisor), Senior, Bolivar (committee member), Atadero, Rebecca (committee member).
Subjects/Keywords: conventional construction; life cycle cost analysis; accelerated bridge construction; user costs; detour
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Alnewar, S. (2018). Life-cycle cost analysis of a bridge in remote mountainous terrain. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/191441
Chicago Manual of Style (16th Edition):
Alnewar, Saurabh. “Life-cycle cost analysis of a bridge in remote mountainous terrain.” 2018. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/191441.
MLA Handbook (7th Edition):
Alnewar, Saurabh. “Life-cycle cost analysis of a bridge in remote mountainous terrain.” 2018. Web. 05 Mar 2021.
Vancouver:
Alnewar S. Life-cycle cost analysis of a bridge in remote mountainous terrain. [Internet] [Masters thesis]. Colorado State University; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/191441.
Council of Science Editors:
Alnewar S. Life-cycle cost analysis of a bridge in remote mountainous terrain. [Masters Thesis]. Colorado State University; 2018. Available from: http://hdl.handle.net/10217/191441

Colorado State University
28.
Nguyen, Trai Ngoc.
Modeling snow-free concrete surfaces using hydronic radiant heat.
Degree: MS(M.S.), Civil and Environmental Engineering, 2018, Colorado State University
URL: http://hdl.handle.net/10217/189402
► U.S. roads and bridges were graded as D and C+, respectively by the American Society of Civil Engineers (ASCE) in 2013. Snow accumulation during the…
(more)
▼ U.S. roads and bridges were graded as D and C+, respectively by the American Society of Civil Engineers (ASCE) in 2013. Snow accumulation during the winter results in many issues affecting national strategic goals. More specifically, it hinders the overall transportation system which significantly affects economic competitiveness. Moreover, it causes many traffic accidents in the winter affecting people's lives and assets. Traditional methods for snow accumulation are the use of deicing agents such as salt-based chemical (NaCl, MgCl2) and sand. However, the application of these chemicals leads to the adverse effects on environment, drainage system and especially infrastructure (corrosion, premature failure). This remarkably raises the maintenance costs on structures. Therefore, it is necessary to conduct an alternative technology for snow removal which is environmentally safe and highly effective to avoid the negative effects of those deicing agents. Heated snow melting systems are potential solutions to prevent snow accumulation that has increasingly drawn attention during the last few decades in many countries. This research presents the method of snow melting with hydronic radiant heat to avoid the negative effects of traditional agents on environment as well as infrastructure systems. Two-dimensional (2D) and three-dimensional (3D) finite element models are developed to investigate the influence of input parameters on the performance of snow melting in various environmental conditions. Intensive parametric studies are conducted to analyze and determine the key factors in the snow melting process. Consequently, appropriate values of those parameters are proposed for future experiments, design and construction in the U.S.
Advisors/Committee Members: Heyliger, Paul R. (advisor), Atadero, Rebecca (committee member), Glick, Scott A. (committee member).
Subjects/Keywords: civil engineering; heat and mass transfer; hydronic snow melting system; finite element method; ASCE; hydronic radiant heat
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APA ·
Chicago ·
MLA ·
Vancouver ·
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APA (6th Edition):
Nguyen, T. N. (2018). Modeling snow-free concrete surfaces using hydronic radiant heat. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/189402
Chicago Manual of Style (16th Edition):
Nguyen, Trai Ngoc. “Modeling snow-free concrete surfaces using hydronic radiant heat.” 2018. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/189402.
MLA Handbook (7th Edition):
Nguyen, Trai Ngoc. “Modeling snow-free concrete surfaces using hydronic radiant heat.” 2018. Web. 05 Mar 2021.
Vancouver:
Nguyen TN. Modeling snow-free concrete surfaces using hydronic radiant heat. [Internet] [Masters thesis]. Colorado State University; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/189402.
Council of Science Editors:
Nguyen TN. Modeling snow-free concrete surfaces using hydronic radiant heat. [Masters Thesis]. Colorado State University; 2018. Available from: http://hdl.handle.net/10217/189402

Colorado State University
29.
Vasishta, Tanmay.
Comparative life cycle assessment (LCA) and life cycle cost analysis (LCCA) of precast and cast-in-place buildings in United States.
Degree: MS(M.S.), Construction Management, 2020, Colorado State University
URL: http://hdl.handle.net/10217/208473
► Precast construction is one of the growing construction methods for buildings across United States. Many tools have been used to assess environmental and economic impacts…
(more)
▼ Precast construction is one of the growing construction methods for buildings across United States. Many tools have been used to assess environmental and economic impacts of the buildings. LCA and LCCA are one of the most widely used tools to evaluate the environmental and economic impacts of the buildings for their complete life cycle. The research aims to understand the life cycle environment impacts and costs over the complete life cycle for precast and cast-in-place building system. Cradle-to-grave approach was used to develop a framework for assessing the these impacts for precast and cast-in-place building systems constructed in United States through Open LCA software and NIST handbook for LCCA. The environmental impacts and costs associated with the four phases (raw material extraction and manufacturing, installation/construction, operation and demolition) of a precast building in United States were calculated and compared to cast-in-place building system. The research findings implicated that precast using sandwich panel building system had 21% lower life cycle costs (LCC) compared to cast-in-place building system. The construction phase and operation phase also had 38 % and 24% lower LCC compared to cast-in-place building systems. Additionally, lower life cycle environmental impacts towards nine environmental impact indicators were recorded for precast building systems. This study concluded that precast methodology has lower life cycle environmental and economic impacts than cast-in-place and is more sustainable construction method. The developed framework for LCA and LCCA could be applied to all concrete construction projects across the world and could be used as platform for conducting future LCA and LCCA studies as well. The research can also be used by practitioners to understand the phase-wise and total life cycle environmental and economic impacts of precast and further investigate to reduce these impacts.
Advisors/Committee Members: Mehany, Mohammed S. Hashem M. (advisor), Killingsworth, John (committee member), Atadero, Rebecca (committee member).
Subjects/Keywords: life cycle assessment; precast buildings; cast-in-place; sustainability; life cycle cost assessment
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Vasishta, T. (2020). Comparative life cycle assessment (LCA) and life cycle cost analysis (LCCA) of precast and cast-in-place buildings in United States. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/208473
Chicago Manual of Style (16th Edition):
Vasishta, Tanmay. “Comparative life cycle assessment (LCA) and life cycle cost analysis (LCCA) of precast and cast-in-place buildings in United States.” 2020. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/208473.
MLA Handbook (7th Edition):
Vasishta, Tanmay. “Comparative life cycle assessment (LCA) and life cycle cost analysis (LCCA) of precast and cast-in-place buildings in United States.” 2020. Web. 05 Mar 2021.
Vancouver:
Vasishta T. Comparative life cycle assessment (LCA) and life cycle cost analysis (LCCA) of precast and cast-in-place buildings in United States. [Internet] [Masters thesis]. Colorado State University; 2020. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/208473.
Council of Science Editors:
Vasishta T. Comparative life cycle assessment (LCA) and life cycle cost analysis (LCCA) of precast and cast-in-place buildings in United States. [Masters Thesis]. Colorado State University; 2020. Available from: http://hdl.handle.net/10217/208473

Colorado State University
30.
Rodriguez Lopez, Santiago.
Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands.
Degree: MS(M.S.), Civil and Environmental Engineering, 2018, Colorado State University
URL: http://hdl.handle.net/10217/191254
► High-Strength bolts are used extensively in structures and are regarded as the better option for connections subjected to fatigue as compared to welds and rivets.…
(more)
▼ High-Strength bolts are used extensively in structures and are regarded as the better option for connections subjected to fatigue as compared to welds and rivets. Studies have shown the superior resistance to fatigue and conclude that it should not be an issue when a bolt is properly pre-tensioned. Nevertheless, a recent application of properly pre-tensioned bolts subjected to shear stress reversals shows extensive fatigue cracking and total severing of up to 50% of the bolts in the connections. Sufficient evidence, based on experimental testing and field observations, exist to suggest the possibility of fully pre-tensioned bolts coming loose due to shear stress reversals. The problem of transverse vibrational loosening of bolts has been extensively researched as well as the issue of bolt fatigue. Only recently have they been considered together although no studies of this interaction have been done on high-strength bolts. Certain mechanisms mark the onset of bolt loosening and fatigue when bolts are subjected to cyclic shear or shear combined with tension. In this study, causes of bolt loosening and fatigue failure of bolted connections are explored. Especially the study pertains to structural bolts that are subjected to cyclic loads in multiple directions with shear reversals, which are typical of mitre gate to pintle socket connections. Certain mechanisms mark the onset of bolt loosening and fatigue when bolts are subjected to cyclic shear or shear combined with tension. The actual mechanisms and limits at which this occurs are explored in the literature and experimentally and recommendations are provided.
Advisors/Committee Members: Mahmoud, Hussam (advisor), Atadero, Rebecca (committee member), Riveros, Guillermo (committee member), Senior, Bolivar (committee member).
Subjects/Keywords: high strength bolts; multiaxial fatigue; slip-critical; mitre gate; connection reliability; pintle bolts
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rodriguez Lopez, S. (2018). Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/191254
Chicago Manual of Style (16th Edition):
Rodriguez Lopez, Santiago. “Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands.” 2018. Masters Thesis, Colorado State University. Accessed March 05, 2021.
http://hdl.handle.net/10217/191254.
MLA Handbook (7th Edition):
Rodriguez Lopez, Santiago. “Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands.” 2018. Web. 05 Mar 2021.
Vancouver:
Rodriguez Lopez S. Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands. [Internet] [Masters thesis]. Colorado State University; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10217/191254.
Council of Science Editors:
Rodriguez Lopez S. Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands. [Masters Thesis]. Colorado State University; 2018. Available from: http://hdl.handle.net/10217/191254
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