Cold Retrofit Method Study for Fatigue Cracking of Steel Bridge
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Bibliographic Details
| Author(s): |
Chun-Sheng Wang
(Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province, College of Highways, Chang’an University, Xi’an, China)
Chang-Yang Ou (Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province, College of Highways, Chang’an University, Xi’an, China) Mu-Sai Zhai (Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province, College of Highways, Chang’an University, Xi’an, China) Lan Duan (Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province, College of Highways, Chang’an University, Xi’an, China) |
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| Medium: | conference paper | ||||
| Language(s): | English | ||||
| Conference: | IABSE Conference: Structural Engineering: Providing Solutions to Global Challenges, Geneva, Switzerland, September 2015 | ||||
| Published in: | IABSE Conference Geneva 2015 | ||||
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| Page(s): | 1227-1234 | ||||
| Total no. of pages: | 8 | ||||
| Year: | 2015 | ||||
| DOI: | 10.2749/222137815818358529 | ||||
| Abstract: |
Lots of steel bridges have endured performance challenge from fatigue cracking problem. Therefore, research on retrofit methods for fatigue cracking in steel bridge is very important. To avoid introducing new fatigue details during retrofit process, cold retrofit study is encouraged and focused in this paper by two experimental studies. The first is cold retrofit for orthotropic steel bridge deck. Fatigue test of a full-scale orthotropic steel bridge deck was conducted and different retrofit methods were applied to the fatigue damaged deck, including drilling stop holes and bonding steel plate. Test result shows bonding steel plate is an effective retrofit method. The second is cold retrofit for steel girder with gusset plates for lateral braces, since out-of-plane distortion often happens in the web gaps between the flange plates and vertical stiffeners, which leads to initiation and propagation of fatigue cracks. Fatigue test was carried out to study the fatigue mechanism and to verify the effectiveness of cold retrofit method, as well as the fatigue performance of post-retrofitted details. Different retrofit methods were experimentally studied, including drilling stop holes, bonding or bolting angle steel. The study result shows cold retrofit method can retard distortion-induced fatigue cracks. Based on the experimental study above, bonding angle steel method was applied to orthotropic steel deck of a long span cable-stayed bridge. |
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| Keywords: |
steel bridge fatigue crack Distortion-induced fatigue Orthotropic steel bridge deck cold retrofit method full-scale fatigue test
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