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Flood fragility analysis of instream bridges

机译：内河桥梁洪水易损性分析

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Flood scour is one of the major causes of bridge failures in the United States. Flood fragility curves can be used as an objective tool to assess the risk of a bridge to exceed some limit-states for a given flood. Despite the method's extensive use in seismic reliability analysis for civil infrastructures, the approach has rarely been utilized in evaluation of scour critical bridges. Flood fragility analysis of a instream bridge structure has been analyzed using first order reliability method. A MATLAB-based code has been developed to perform the analysis combining the first order reliability analysis tool of FERUM (Finite Element Reliability Analysis using MATLAB) and finite element structural analysis code ABAQUS. The developed code passes information back and forth between FERUM and ABAQUS in the iterative process to progress the analysis. Moreover, the code is capable of simulating scour depth, corresponding change in foundation parameter, variable limit-state for given inputs, which are realized by generating new finite element structural model each time FERUM calls ABAQUS. The proposed automated procedure has been demonstrated by deriving fragility curves, due to flood induced scour and stream water pressure, for a real bridge.
机译：洪水冲刷是美国桥梁故障的主要原因之一。洪水脆弱性曲线可以用作评估桥梁超过给定洪水超出某些极限状态的风险的客观工具。尽管该方法广泛用于民用基础设施的地震可靠性分析中，但该方法很少用于评估冲刷关键桥梁。使用一阶可靠度方法对入流桥梁结构的洪水脆性分析进行了分析。已开发出基于MATLAB的代码，以结合FERUM的一阶可靠性分析工具（使用MATLAB进行有限元可靠性分析）和有限元结构分析代码ABAQUS来执行分析。开发的代码在迭代过程中在FERUM和ABAQUS之间来回传递信息，以进行分析。而且，该代码能够模拟冲刷深度，给定输入的地基参数的相应变化，可变极限状态，这是通过在每次FERUM调用ABAQUS时生成新的有限元结构模型来实现的。通过推导实际桥梁由于洪水引起的冲刷和水流压力而产生的脆性曲线，已证明了所提出的自动化程序。

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