基于改进拉丁超立方抽样的高墩铁路桥梁地震可靠度分析方法  

Seismic Reliability Analysis Method for High-pier Railway Bridges Based on Improved Latin Hypercube Sampling

作　　者：张金 陈克坚[1] 曾永平[1] 刘力维 杨振宇 陈志强 ZHANG Jin;CHEN Kejian;ZENG Yongping;LIU Liwei;YANG Zhenyu;CHEN Zhiqiang(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031 [2]成都理工大学环境与土木工程学院,四川成都610059 [3]成都大学建筑与土木工程学院,四川成都610106

出　　处：《铁道学报》2024年第8期142-151,共10页Journal of the China Railway Society

基　　金：国家自然科学基金(52008047,U1934207);西藏自治区科技计划项目(XZ202201ZY0021G);中铁二院院控科研课题(KSNQ223016,KSNQ201062)。

摘　　要：为高效准确地量化非线性结构的关键地震响应极值分布以及构件失效概率,在考虑结构和地震双重不确定的前提下发展一种有效的结构动力可靠度评估框架。首先详细阐述和发展了地震可靠度分析的理论方法,主要包括非平稳地震动的降维模拟,分数矩的单循环最大熵理论,以及与中心L2偏差相结合的拉丁超立方抽样方法三部分。然后通过一个三层非线性混凝土框架结构对所提出的方法进行初步验证。最后将提出的可靠度分析方法运用于西部山区某高墩大跨铁路刚构桥,开展高墩大跨刚构桥关键构件的地震可靠度分析,并与蒙特卡洛模拟结果进行对比,进一步验证该方法的高效性与适用性,为山区高墩大跨铁路桥梁抗震设防提供技术支撑。In order to efficiently and accurately quantify the extreme value distribution of critical seismic response and component failure probability of complex nonlinear structures,an effective structural dynamic reliability evaluation framework was proposed under the precondition of considering both structural and seismic uncertainties.Firstly,the basic principles and theoretical methods of seismic reliability analysis were elaborated and developed,including dimensionality reduction simulation of non-stationary ground motions,single-cycle maximum entropy theory of fractional moments,and Latin hypercube sampling combined with central L2 bias method.Then,a three-story nonlinear concrete shear frame structure was used to preliminarily validate the proposed method.Finally,the proposed reliability analysis method was applied to a high-pier and long-span railway rigid-frame bridge in the western mountainous area to carry out the seismic reliability analysis of the key components of the high-pier and long-span rigid-frame bridge.The results were compared with those of the Monte Carlo simulation to further verify the efficiency and applicability of the proposed method,which provides technical support for the seismic fortification of such bridges.

关 键 词：随机非平稳地震动 高墩铁路桥梁 拉丁超立方抽样 最大熵原理 地震可靠度 

分 类 号：TU311.3[建筑科学—结构工程] U24[交通运输工程—道路与铁道工程]