桥梁系统地震多维易损性分析

王其昂; 吴子燕; 贾兆平

doi:10.6052/j.issn.1000-4750.2012.06.0464

桥梁系统地震多维易损性分析

西北工业大学力学与土木建筑学院，西安710129

基金项目: 国家自然科学基金项目(50878184,50875212,51278420)

详细信息

作者简介:
吴子燕(1962―)，女，浙江宁波人，教授，博士，博导，从事结构可靠性设计与结构健康监测研究(E-mail: zywu@nwpu.edu.cn)；贾兆平(1989―)，男，江苏南京人，硕士生，从事基于性能的结构设计与可靠性评估研究(E-mail: zpjia1989@gmail.com).

通讯作者:
王其昂(1986―),男,安徽宿州人,博士生,从事结构可靠性的理论与应用研究(E-mail:qawang2011@gmail.com).

中图分类号: TU318
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- 文章访问数: 427
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出版历程
- 收稿日期: 2012-06-28
- 修回日期: 2012-08-18
- 刊出日期: 2013-10-24

MULTI-DIMENSIONAL FRAGILITY ANALYSIS OF BRIDGE SYSTEM UNDER EARTHQUAKE

School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, 02019;an 710129, China

摘要

摘要: 综合考虑地震地面运动以及性能极限状态的不确定性，提出了基于多地震需求参数分析的桥梁系统易损性评估方法，将易损性概念从一维扩展到多维。该方法首次提出服从多元对数正态分布的概率地震需求模型探讨桥梁体系各构件响应相关性，同时考虑各构件性能极限状态的相关性建立多维性能极限状态方程，确定结构失效域，通过MonteCarlo模拟计算系统多维地震易损性。以某一钢筋混凝土多跨连续梁高速公路桥为算例，通过非线性动力分析法获得最大响应样本，利用最大似然估计求得概率地震需求模型未知参数，计算体系多维易损性，并与构件易损性相比较。结果表明：桥梁体系多维易损性较构件易损性偏大，可避免用单一构件易损性代替系统易损性产生的非保守估计，预测结果更利于工程安全，为桥梁修复加固和交通系统可靠性分析提供理论依据。
- 桥梁工程 /
- 多维易损性 /
- 多维性能极限状态 /
- 概率地震需求模型 /
- 非线性动力分析 /
- 可靠性分析
Abstract: A multi-dimensional fragility evaluation methodology for bridge is proposed based on multiple seismic demand parameter analysis. The method incorporates uncertainties in ground motion and performance limit state (PLS) and extends the definition of fragility to multi-dimension problems. A novel probabilistic seismic demand model (PSDM) accorded with multivariate lognormal distribution is addressed to discuss the dependencies of various component responses. Considering the correlation of component PLS, the generalized multi-dimensional PLS function is established. Finally Monte Carlo simulation is performed to calculate the fragility of system. A multi-span continuous reinforced concrete girder bridge is used as an example to illustrate the approach. The samples of maximum responses are obtained through nonlinear dynamic analysis to calculate the maximum likelihood estimators of unknown parameters in PSDM, then the system fragility curve is developed and compared with individual component fragility. The result shows that multi-dimensional fragility of bridge is higher than component fragility, thus eliminating non-conservative estimation resulting from substituting the component fragility for system. The proposed method will better ensure the safety of structures, providing theoretical evidence for bridge retrofit and reliability analysis of transportation network.
- bridges /
- multi-dimensional fragility /
- multi-dimensional performance limit state /
- probabilistic seismic demand model /
- nonlinear dynamic analysis /
- reliability analysis

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参考文献(29)

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文章访问数: 427
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桥梁系统地震多维易损性分析

通讯作者: 王其昂(1986―),男,安徽宿州人,博士生,从事结构可靠性的理论与应用研究(E-mail:qawang2011@gmail.com).

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MULTI-DIMENSIONAL FRAGILITY ANALYSIS OF BRIDGE SYSTEM UNDER EARTHQUAKE

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通讯作者:
王其昂(1986―),男,安徽宿州人,博士生,从事结构可靠性的理论与应用研究(E-mail:qawang2011@gmail.com).