桥梁结构系统地震易损性分析方法研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (21) : 273-280.

论文

桥梁结构系统地震易损性分析方法研究

吴文朋1, 2, 3，李立峰2

作者信息 +

System seismic fragility analysis methods for bridge structures

WU Wenpeng1,2,3, LI Lifeng2

Author information +

文章历史 +

摘要

桥梁工程是由多个相互联系和作用的构件组成的结构系统，地震作用下任何构件发生损伤都可能影响桥梁使用功能的完整性，采用单个构件的易损性来表示桥梁整体的易损性往往会高估桥梁的抗震能力。以一座多跨钢筋混凝土连续梁桥为例，基于OpenSEES软件建立有限元模型并进行大量的非线性时程分析，同时考虑桥墩、铅芯橡胶支座、板式橡胶支座和桥台四类构件的地震破坏，分别采用界限估计法、Monte-Carlo模拟法和条件边缘乘积法（PCM）建立了桥梁系统地震易损性曲线。通过这些系统易损性曲线的对比分析，讨论了各种分析方法的适用性和合理性。研究结果表明，基于传统界限估计和PCM法的系统易损性分析依赖于构件易损性分析的结果，而Monte-Carlo方法可以直接建立桥梁的系统易损性曲线，并独立考虑各种不确定性的影响；PCM法能快速建立精确的桥梁系统易损性曲线，适用于需要考虑多种失效模式的桥梁系统易损性分析。

Abstract

A bridge is a structural system consisting of various interrelated and interacting components, and any component’s damage under earthquake affects the bridge’s functional integrity.Adopting a single component fragility to express the bridge’s system fragility may over-estimate the bridge’s aseismic capacity.A multi-span RC continuous girder bridge was taken as an example, and its finite element model was constructed with the software OpenSEES to conduct a great number of nonlinear time-history analyses.Simultaneously considering seismic damages of bridge pier, lead core rubber bearing, plate-type rubber bearing and bridge abutment, the bound estimation method, Monte-Carlo simulation one and the product of conditional marginal (PCM) one were applied to establish the bridge’s system seismic fragility curves.These fragility curves were contrastively analyzed to judge the applicability and reasonability of the three methods.The results showed that the traditional bound estimation method and the PCM one depend on component fragility analysis results, while Monte-Carlo simulation method is able to directly construct the bridge’s system fragility curve and to independently consider effects of various uncertainties; the PCM method can be used to quickly construct the bridge’s accurate system fragility curve, and it is more applicable for the bridge system fragility analysis considering multiple failure modes.

导出引用

吴文朋1, 2, 3，李立峰2. 桥梁结构系统地震易损性分析方法研究[J]. 振动与冲击, 2018, 37(21): 273-280

WU Wenpeng1,2,3, LI Lifeng2. System seismic fragility analysis methods for bridge structures[J]. Journal of Vibration and Shock, 2018, 37(21): 273-280

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