| 英文摘要 |
In Taiwan, several failures of highway bridges which had suffered foundation scour occurred in recent years. One of the most representative cases is the Shuang-Yuan Bridge, which was partially demolished in a flood caused by Typhoon Morakot in 2009. A case study on the failure of Shuang-Yuan Bridge was performed considering various flood and scour conditions to demonstrate the procedures of a nonlinear quasi-static analysis for the evaluation on the flood resistant capacity of scoured bridges with pile foundations under flow-induced loads. Regarding the modeling of the soil-foundation system, the Winkler beam model is adopted. The distributed hinge model is introduced to represent the possible flexural failure of the piles. The soil springs with nonlinear p-y curves are used to represent the nonlinearity of the supporting soil. According to the analysis results, the possible scenario for the collapse of the Shuang-Yuan Bridge can be speculated, and the method utilized can thus be proved to give a reasonable assessment of the flood resistant capacity of bridges with scoured pile foundations. |
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