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中文標題: 受沖刷橋梁耐洪能力評估方法
英文標題: Evaluation on Flood Resistant Capacity of Scoured Bridges
編號: NCREE-12-020
語言: 中文
編輯:
媒體型式: 紙本
作者:
柯永彥   邱俊翔   蔡煜青   陳正興   
中文摘要: 橋墩受水流沖刷造成之基礎裸露將顯著削弱基礎之承載力,並將因此
造成橋梁之耐洪能力降低。本研究中,針對採用樁基礎之橋梁,提出一套
求取橋梁受水流力作用下性能表現之擬靜力非線性分析程序,其將可應用
於受沖刷橋梁之耐洪能力評估。其中,樁~土系統係採用溫克梁模式模擬,
樁身可能發生之撓曲破壞則採用均佈塑鉸模式來模擬,並以非線性p-y 曲線
之土壤彈簧模擬承載土體之非線性行為。此外,為示範此分析程序,本研
究選定於2009 年莫拉克颱風期間遭巨量洪水沖毀部分橋體之台17 線雙園
大橋作為案例,評估其於不同洪水與沖刷條件下之耐洪性能。由相關分析
結果可藉以推測雙園大橋發生破壞時之可能情境,並證明本研究所採用之
方法能合理評估樁基礎橋梁於受沖刷情況下之耐洪能力。
英文摘要: The exposure of the foundations of bridge piers due to scour significantly reduces the foundation bearing capacity, and thus decreases the flood resistant capacity of a bridge. A nonlinear quasi-static analysis procedure for the performance of bridges with pile foundations under flow-induced loads is proposed in this research for the evaluation on the flood resistant capacity of scoured bridges. The Winkler beam model is adopted for the modeling of the pile-soil system, and the distributed hinge model is utilized to simulate the possible flexural failure of the piles. Soil springs with nonlinear p-y curves are used to represent the nonlinearity of the supporting soil. In order to demonstrate this procedure, a case study on the Shuang-Yuan Bridge in Taiwan, which was partially destroyed in a major flood event caused by Typhoon Morakot in 2009, was performed for various flood and scour conditions. According to the analysis results, a possible scenario for the failure of the Shuang-Yuan Bridge is presented, and the proposed method is shown to give a reasonable assessment of the flood resistant capacity of bridges with scoured pile foundations.
關鍵字: 橋梁沖刷、基礎裸露、耐洪能力、溫克梁模式、均佈塑鉸模式、非線性p-y 曲線
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