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Seismic fragility analysis of bridge piers using methods of moment
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.soildyn.2020.106150
Long-Wen Zhang , Zhao-Hui Lu , Cheng Chen

Abstract In this paper, an efficient method is proposed for constructing the seismic fragility curves of bridge piers, in which the dynamical reliability assessment is developed from methods of moment. The main procedure for constructing seismic fragility curves consists of four steps. First, the non-stationary seismic acceleration process samples are simulated by the random function-spectrum representation model (RFSRM) with one elementary random variable at a given PGA value. Second, the first four moments (i.e., mean value, standard deviation, skewness and kurtosis) of extreme structural response are then evaluated from the extremum of each nonlinear time-history seismic response based on RFSRM. Third, the failure probability is then estimated by the fourth-moment reliability index, which is derived from an explicit fourth-moment transformation. Finally, the seismic fragility curves can be constructed by repeating the three steps and considering different PGA values and damage levels (i.e., slight, moderate, extensive, and complete). The efficiency and accuracy of the proposed methodology are demonstrated by a numerical example for constructing the fragility curves of a high-speed railway bridge pier in which the direct incremental dynamic analysis (IDA) method based on Monte Carlo simulations are employed for comparison.

中文翻译:

基于弯矩法的桥墩抗震易损性分析

摘要 本文提出了一种有效的桥墩地震易损性曲线构建方法,其中桥墩的动力可靠性评估是从矩量法发展而来的。构造地震脆性曲线的主要程序包括四个步骤。首先,非平稳地震加速度过程样本通过随机函数谱表示模型(RFSRM)在给定的 PGA 值下使用一个基本随机变量进行模拟。其次,根据每个非线性时程地震响应的极值,基于 RFSRM 评估极端结构响应的前四个矩(即平均值、标准偏差、偏度和峰度)。第三,然后通过从显式四阶矩变换导出的四阶矩可靠性指数估计失效概率。最后,通过重复三个步骤并考虑不同的 PGA 值和损坏程度(即轻微、中度、广泛和完全),可以构建地震易损性曲线。通过一个构建高速铁路桥墩脆弱性曲线的数值例子,该方法的效率和准确性得到了证明,其中采用基于蒙特卡罗模拟的直接增量动力分析(IDA)方法进行比较。
更新日期:2020-07-01
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