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University of Saskatchewan

1. Morgan, Chris J 1989-. Fatigue Life Evaluation of the Diefenbaker Bridge Using Structural Health Monitoring.

Degree: 2019, University of Saskatchewan

As bridge infrastructure continues to age, public agencies must reliably determine which structures can remain in service, and which structures require rehabilitation or replacement. Structural fatigue is a common problem for many aging steel structures and its evaluation is one that carries a high level of uncertainty. Structural health monitoring is one technique that infrastructure owners can employ to reduce this uncertainty, thereby allowing them to make the necessary investment with confidence. Structural fatigue occurs when steel components of a bridge are subjected to stress cycles, with most details able to withstand only a limited number of cycles. The challenge in determining the remaining fatigue life of a bridge is the uncertainty in stress cycle history and in-situ structural behaviour. The Canadian Highway Bridge Design Code (CSA S6-14) does not address fatigue life evaluation directly, which creates an even larger challenge for engineers. Structural health monitoring is a technique that engineers and owners can use to reduce this uncertainty because it helps to reveal actual stress levels and cycle counts. Structural health monitoring was used to inform the numerical determination of the remaining fatigue life of Diefenbaker Bridge’s bracing connections to the girder webs. The Diefenbaker Bridge is located in Prince Albert, Saskatchewan, Canada. The 304 meter long, seven span bridge consists of two separate fracture critical superstructures, each comprising a cast-in-place concrete deck supported by two welded steel I-beams. The separate superstructures share a cast-in-place concrete substructure. Given the age of this bridge, and its history of frequent rehabilitation, an understanding of the remaining fatigue life was of critical importance to its owner since asset management plans depended on the outcome. To perform the evaluation, the structure was instrumented with strain gauges, accelerometers, and a weather station. Data was collected for six months and was used to characterize in-situ bridge behaviour (i.e., lateral load distribution, degree of composite action, and dynamic load influence) and to evaluate the bridge’s remaining fatigue life using various methods of fatigue life evaluation, including deterministic methods (including the method outlined in AASHTO), and a probabilistic method. Lastly, fatigue damage was characterized to determine what stress magnitudes contribute the most damage, and which connections are the most heavily loaded. In addition, fatigue damage was computed per girder on a daily and monthly basis. This research demonstrated that costly improvements to the lateral bracing’s connection to the girder webs on Diefenbaker Bridge are not required, and that, under the most conservative scenario, 52 years of fatigue life remain. A strong correlation between the deterministic and AASTHO methods of fatigue life evaluation was found, with the probabilistic method providing a consistently longer remaining fatigue life. By characterizing the fatigue damage accumulated during the… Advisors/Committee Members: Sparling, Bruce, Wegner, Leon, Feldman, Lisa, Boulfiza, Moh, Hawkes, Christopher, Odeshi, Akindele.

Subjects/Keywords: Bridge; Rehabilitation; Structural Health Monitoring; Fatigue; Evaluation; Diefenbaker Bridge

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APA (6th Edition):

Morgan, C. J. 1. (2019). Fatigue Life Evaluation of the Diefenbaker Bridge Using Structural Health Monitoring. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12141

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):

Morgan, Chris J 1989-. “Fatigue Life Evaluation of the Diefenbaker Bridge Using Structural Health Monitoring.” 2019. Thesis, University of Saskatchewan. Accessed July 20, 2019. http://hdl.handle.net/10388/12141.

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

MLA Handbook (7th Edition):

Morgan, Chris J 1989-. “Fatigue Life Evaluation of the Diefenbaker Bridge Using Structural Health Monitoring.” 2019. Web. 20 Jul 2019.

Vancouver:

Morgan CJ1. Fatigue Life Evaluation of the Diefenbaker Bridge Using Structural Health Monitoring. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Jul 20]. Available from: http://hdl.handle.net/10388/12141.

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

Council of Science Editors:

Morgan CJ1. Fatigue Life Evaluation of the Diefenbaker Bridge Using Structural Health Monitoring. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12141

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

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