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Investigation and Retrofit of Distortion-Induced Fatigue Cracks in a Double-Deck Cantilever-Suspended Steel Truss Bridge
| 题名： | Investigation and Retrofit of Distortion-Induced Fatigue Cracks in a Double-Deck Cantilever-Suspended Steel Truss Bridge |
| 其他题名： | AASHTO.(2007).LRFD bridge design specifications,3rd Ed.,Washington,DC. |
| 正文语种： | 英文 |
| 作者： | Y. Edward Zhou |
| 关键词： | Steel truss bridge;Distortion induced fatigue;Finite-element analysis;Field testing;High-stress low-cycle fatigue;Fatigue retrofit;Special design issues |
| 摘要： | This paper discusses a comprehensive investigation and retrofit for extensive fatigue cracks in the end connections of floor beams on a double-deck, cantilever-suspended steel truss bridge. The investigation involved three-dimensional (3D) finite-element analyses using global and local models, field measurement of strains and displacements due to live load and temperature, laboratory testing of steel samples for material properties and high-stress low-cycle fatigue characteristics, as well as development of an effective retrofit based on the analytical, experimental, and field testing results. It was concluded that the cracks were a result of distortion induced fatigue in the floor beam web due to interactive deformations of the global structural system under live load and temperature variations. The retrofit entailed removing the fatigue susceptible weld terminations and reinforcing local areas of the floor beam web for out-of-plane distortion. Construction of the fatigue retrofit was completed in July 2011. The repaired structure has performed satisfactorily since then. |
| 出版年： | 2015 |
| 论文唯一标识： | P-26Y2015V141N01013 |
| 英文栏目名称： | Technical Papers |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001113 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 141 |
| 期： | 01 |
| 页码： | 124-135 |
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