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You searched for subject:(Structural Pounding). Showing records 1 – 3 of 3 total matches.

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University of Colorado

1. Isteita, Moad. Studies of Earthquake Pounding Risk and of Above-Code Seismic Design.

Degree: PhD, 2019, University of Colorado

This thesis tests three hypotheses: (1) Some US practice to determine the required separation distance to preclude pounding between neighboring buildings is overly conservative. (2) Pounding between buildings with aligned floors significantly contributes to collapse. (3) Above-code design of a common engineered commercial building type is cost effective in many though perhaps not all US locations, at least from a benefit-cost-analysis perspective. The first part of this thesis reexamines the required minimum permissible space between two adjacent buildings to preclude earthquake pounding. This part of the thesis employs and compares three analytical approaches to estimate the minimum safe distance conditioned on the occurrence of risk-targeted maximum considered earthquake (<i>MCER</i>) shaking. 1) First, safe separation distance between buildings is estimated using elastic spectral displacement response of adjacent buildings at the top of the shorter building, accounting for mode shape and the height difference. 2) ASCE 7-16’s equivalent lateral force procedure is also examined. 3) Finally, multiple linear elastic dynamic structural analyses of two adjacent buildings are performed, factoring drift estimates by ASCE 7-16’s Cd/R to approximate nonlinear response. To examine diverse, though not exhaustive, conditions, this thesis examines 3 combinations of shearwall and steel moment frame buildings; 5 building heights between 2 and 26 stories; fundamental periods of vibration vary between 0.2 sec and 2.8 sec; and 4 locations with degrees of seismicity in roughly equal increments corresponding to short-period mapped spectral acceleration response SMS from 0.8 to 3.0g. Part 2 repeats much of the analysis of part 1, but with an additional structural analysis procedure (nonlinear dynamic analysis) but with a narrower set of building types. As with part 1, this part evaluates the required minimum permissible space between two adjacent buildings to preclude earthquake pounding. Unlike part 1, this part develops a set of conversion factors to relate the separation distances calculated by any of the simpler methods (elastic spectral displacement, equivalent lateral force, and multiple linear elastic dynamic structural analyses) to multiple nonlinear dynamic structural analyses method. This part examines 3 combinations of special reinforced concrete moment frame buildings, SMF, and ordinary reinforced concrete moment frame buildings Advisors/Committee Members: Keith A. Porter, Ross Corotis, Bruce Ellingwood, Jim Harris, M. Amin Hariri-Ardebili.

Subjects/Keywords: above-code seismic design; benefit-cost analysis; buildings collapse safety; earthquake hazard mitigation; safe structural separation; seismic pounding risk; Civil Engineering

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APA (6th Edition):

Isteita, M. (2019). Studies of Earthquake Pounding Risk and of Above-Code Seismic Design. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/484

Chicago Manual of Style (16th Edition):

Isteita, Moad. “Studies of Earthquake Pounding Risk and of Above-Code Seismic Design.” 2019. Doctoral Dissertation, University of Colorado. Accessed September 29, 2020. https://scholar.colorado.edu/cven_gradetds/484.

MLA Handbook (7th Edition):

Isteita, Moad. “Studies of Earthquake Pounding Risk and of Above-Code Seismic Design.” 2019. Web. 29 Sep 2020.

Vancouver:

Isteita M. Studies of Earthquake Pounding Risk and of Above-Code Seismic Design. [Internet] [Doctoral dissertation]. University of Colorado; 2019. [cited 2020 Sep 29]. Available from: https://scholar.colorado.edu/cven_gradetds/484.

Council of Science Editors:

Isteita M. Studies of Earthquake Pounding Risk and of Above-Code Seismic Design. [Doctoral Dissertation]. University of Colorado; 2019. Available from: https://scholar.colorado.edu/cven_gradetds/484


Utah State University

2. Xing, Shutao. Structural Identification and Damage Identification using Output-Only Vibration Measurements.

Degree: PhD, Civil and Environmental Engineering, 2011, Utah State University

This dissertation studied the structural identification and damage detection of civil engineering structures. Several issues regarding structural health monitoring were addressed. The data-driven subspace identification algorithm was investigated for modal identification of bridges using output-only data. This algorithm was tested through a numerical truss bridge with abrupt damage as well as a real concrete highway bridge with actual measurements. Stabilization diagrams were used to analyze the identified results and determine the modal characteristics. The identification results showed that this identification method is quite effective and accurate. The influence of temperature fluctuation on the frequencies of a highway concrete bridge was investigated using ambient vibration data over a one-year period of a highway bridge under health monitoring. The data were fitted by nonlinear and linear regression models, which were then analyzed. The substructure identification by using an adaptive Kalman filter was investigated by applying numerical studies of a shear building, a frame structure, and a truss structure. The stiffness and damping were identified successfully from limited acceleration responses, while the abrupt damages were identified as well. Wavelet analysis was also proposed for damage detection of substructures, and was shown to be able to approximately locate such damages. Delamination detection of concrete slabs by modal identification from the output-only data was proposed and carried out through numerical studies and experimental modal testing. It was concluded that the changes in modal characteristics can indicate the presence and severity of delamination. Finite element models of concrete decks with different delamination sizes and locations were established and proven to be reasonable. Pounding identification can provide useful early warning information regarding the potential damage of structures. This thesis proposed to use wavelet scalograms of dynamic response to identify the occurrence of pounding. Its applications in a numerical example as well as shaking table tests of a bridge showed that the scalograms can detect the occurrence of pounding very well. These studies are very useful for vibration-based structural health monitoring. Advisors/Committee Members: Marvin W. Halling, ;.

Subjects/Keywords: Bridge Health Monitoring; Damage Identification; Delamination Detection; Finite Element Modeling; Structural Pounding; Substructural Identification; Civil and Environmental Engineering

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APA (6th Edition):

Xing, S. (2011). Structural Identification and Damage Identification using Output-Only Vibration Measurements. (Doctoral Dissertation). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/1067

Chicago Manual of Style (16th Edition):

Xing, Shutao. “Structural Identification and Damage Identification using Output-Only Vibration Measurements.” 2011. Doctoral Dissertation, Utah State University. Accessed September 29, 2020. https://digitalcommons.usu.edu/etd/1067.

MLA Handbook (7th Edition):

Xing, Shutao. “Structural Identification and Damage Identification using Output-Only Vibration Measurements.” 2011. Web. 29 Sep 2020.

Vancouver:

Xing S. Structural Identification and Damage Identification using Output-Only Vibration Measurements. [Internet] [Doctoral dissertation]. Utah State University; 2011. [cited 2020 Sep 29]. Available from: https://digitalcommons.usu.edu/etd/1067.

Council of Science Editors:

Xing S. Structural Identification and Damage Identification using Output-Only Vibration Measurements. [Doctoral Dissertation]. Utah State University; 2011. Available from: https://digitalcommons.usu.edu/etd/1067


Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

3. Δημητρακόπουλος, Ηλίας. Ανάλυση της σεισμικής απόκρισης γεφυρών από σκυρόδεμα με φαινόμενα μονόπλευρης επαφής.

Degree: 2009, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

The goal of this study is to investigate the problem of seismic response of bridges with contact (pounding) phenomena. This research is motivated by the findings of many earthquake reconnaissance reports, which show that contact phenomena are observed systematically during the seismic response of bridges with joints and in some cases they burden the response. The complicacy imposed by the strongly non-linear contact phenomena and the multiparametric nature of these problems, are inherent obstacles in any analytical treatment of the phenomenon. To this end, this thesis adopts and combines knowledge from different scientific areas. In particular, the problem of the seismic response of bridges with joints is tackled, for the first time, with the assumption of rigid multibodies with unilateral contact, while also for the first time, the problem is approached by implementing the theory of formal dimensional analysis. Both centric and non-centric contact is considered with emphasis on skew bridges. The aforementioned adopted methodologies as well as the necessary algorithm developed for the numerical investigation, are presented, after a critical review of the relevant literature. The original contribution of the thesis, in terms of results and conclusions, starts with the study of the response of elastic single degree of freedom oscillators in a row. The reversion to these fundamental mechanical systems is characterized by the novel re-examination of the problem via the inequality laws of unilateral contact and with the aid of dimensional analysis. Firstly, three fundamental assumptions are made: i) it is assumed that the behaviour of the oscillators (individual bridge segments) remains within the elastic range, ii) unilateral contact is assumed to be centric and frictionless and iii) only pulse-type base excitations are considered. The same approach is then extended in three different directions emerging naturally from the generalization of each of the three simplifying assumptions. In particular, instead of elastic oscillators, inelastic oscillators are also examined. Non-centric contact with friction is considered, as a starting basis for the treatment of non-centric unilateral contact in bridges. Finally, it is noted that up to date, the dimensional analysis approach of describing seismic behaviour concerned only pulse-type excitations. This thesis extends the same approach to cover the case of records without distinct pulses. The proposed dimensional-analysis-approach, focuses on bringing forward the similarity and the scaling laws that govern natural phenomena. When the seismic response is described in the proposed (by the thesis) dimensionless Π-terms, on one hand the number of arguments of the problem is reduced and on the other hand remarkable order emerges. It is shown, that regardless of the acceleration level and the frequency content of the excitation, all response spectra become self-similar and follow a single master curve. This is true for elastic as well as inelastic (non-linear) structural response with…

Subjects/Keywords: Κρούση κατασκευών; Μονόπλευρη επαφή; Διαστατική ανάλυση; Αντισεισμική μηχανική; Δυναμική κατασκευών; Μη γραμμική ανάλυση; Pounding of structures; Unilateral contacts; Dimensional analysis; Earthquake engineering; Structural dynamics; Nonlinear analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Δημητρακόπουλος, . . (2009). Ανάλυση της σεισμικής απόκρισης γεφυρών από σκυρόδεμα με φαινόμενα μονόπλευρης επαφής. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/20128

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Δημητρακόπουλος, Ηλίας. “Ανάλυση της σεισμικής απόκρισης γεφυρών από σκυρόδεμα με φαινόμενα μονόπλευρης επαφής.” 2009. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed September 29, 2020. http://hdl.handle.net/10442/hedi/20128.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Δημητρακόπουλος, Ηλίας. “Ανάλυση της σεισμικής απόκρισης γεφυρών από σκυρόδεμα με φαινόμενα μονόπλευρης επαφής.” 2009. Web. 29 Sep 2020.

Vancouver:

Δημητρακόπουλος . Ανάλυση της σεισμικής απόκρισης γεφυρών από σκυρόδεμα με φαινόμενα μονόπλευρης επαφής. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2009. [cited 2020 Sep 29]. Available from: http://hdl.handle.net/10442/hedi/20128.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Δημητρακόπουλος . Ανάλυση της σεισμικής απόκρισης γεφυρών από σκυρόδεμα με φαινόμενα μονόπλευρης επαφής. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2009. Available from: http://hdl.handle.net/10442/hedi/20128

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.