Mash, Jason Anthony
(2022)
Repair Strategies for Corroded Steel Bridge Girder End Regions.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
The objective of this research is to investigate practical in situ repair methods, using high performance and traditional materials, which can be applied to corroded and/or damaged steel girder ends. The focus of the study is on girder end repairs associated with corrosion and damage typically resulting from leaking deck joints. Resulting corrosion damage patterns may be exacerbated or mitigated by local details such as the presence of stiffeners or the nature of the bearing provided. Through an integrated analytical and experimental study, the existing capacity of archetypal corroded end regions was assessed. Techniques for providing in situ rehabilitation of these regions using both high performance and conventional means were explored. Six W24 girders were tested over short shear spans. The girders had significant deterioration including section loss on the web and holes (100% section loss) over the bearing region. For each girder, End A was tested under static load conditions to failure. If an acceptable result was achieved after testing End A, End B was fatigue conditioned for 1 million cycles and subsequently tested to failure in a similar manner to End A. Repair methods considered included conventional bolted steel repairs, ultra-high performance and normal strength reinforced concrete encasement and adhesively applied fiber-reinforced polymer (FRP) plates. All methods but FRP plates were able to restore the original, undeteriorated bearing and shear capacities of the girders. A nonlinear finite element model was developed for each repair method. These models clearly identified the transition of failure modes based on repair methods and identified the ability of stiffer bearing stiffeners to permit tension field action to develop in the girder end panels. Finally an extensive qualitative assessment of all repair methods considered is presented.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
6 September 2022 |
| Date Type: |
Publication |
| Defense Date: |
16 May 2022 |
| Approval Date: |
6 September 2022 |
| Submission Date: |
19 May 2022 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
191 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Civil and Environmental Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Bridge Repair
Steel Bridge Repair
Girder End Repair |
| Date Deposited: |
06 Sep 2022 16:20 |
| Last Modified: |
06 Sep 2022 16:20 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/43014 |
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