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Field Test and Finite Element of I-345 Bridge in Dallas
| 题名： | Field Test and Finite Element of I-345 Bridge in Dallas |
| 作者： | Barrett, A. S.; Kim, H.; Frank, K. H. |
| 关键词： | Bridges##Field test##Stresses##Fatigue cracks##Controlled truck traffic##Finite element model##Fatigue performance##Retrofit## |
| 摘要： | This report documents a field test to determine the stresses at areas where fatigue cracks had formed in the bridges. Two bridges were instrumented and subjected to controlled truck traffic. In addition, the service fatigue stresses were evaluated by monitoring the stresses for a 1 week period after the controlled truck testing. A three dimensional finite element model was constructed of each bridge. The stresses from the field tests and the model were compared. The floor beams were found to behave as composite with the bridge deck when the truck loads were near floor beams. The local stress at the critical sections was in reasonable agreement between the field and analytical results. Proposed retrofit schemes were evaluated in the analytical model. In general, the proposed schemes appear to reduce the stresses at the critical locations, however high stresses are generated in other areas that have not cracked. The unsymmetrical support conditions of some of the girder units cause twisting of bridge section. Adding of additional supports to make the bridge support symmetrical will also improve fatigue performance of the bridge. |
| 总页数： | 169 |
| 报告类型： | 科技报告 |
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