大跨斜拉桥多点激励随机地震响应研究  

Research on random seismic response of long-span cable-stayed bridge under multi-excitation

作　　者：焦常科[1,2] 李爱群[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《振动工程学报》2013年第5期707-714,共8页Journal of Vibration Engineering

基　　金：国家杰出青年基金资助项目(50725828)

摘　　要：虚拟激励法可以高效地计算结构随机响应,但目前并没有整合到既有有限元软件中,阻碍了其推广应用,在很多情况下尚需针对具体模型进行编程计算。将该方法整合到既有的有限元软件中,对虚拟激励法的推广使用具有重要意义。大跨柔性结构的初始平衡对其动力响应具有重要影响。在既有研究的基础上,基于Abaqus/Python平台实现了大跨柔性结构需考虑初始平衡态影响的多点激励随机响应计算流程。以目前跨度最大的双层公路斜拉桥——上海闵浦大桥为例,研究大跨斜拉桥多点激励随机地震响应的特点,并分析了视波速对随机地震响应的影响。The pseudo-excitation method （abbr.PEM） is of high efficency in computing the stochastic response of structures,however,it has not been incorporated in any finite element software,which may hinder its application and programming works should be coded exactly for specific models.Thus,it is important to integrate PEM into the existing finite element software.The initial equilibrium state of structure has significant effect on the dynamic behavior of long-span flexible structures.The procedure of calculating stochastic response of flexible structures under multi-excitation on the basis of existing researches with Abaqus/Python is presented,with the initial equilibrium states of structures considered.Shanghai Minpu Bridge,which is the longest double-deck long-span high-way cable-stayed bridge in the world,is taken as an example to study the stochastic seismic behavior of long-span cable-stayed bridge under multi-excitations,and the influence of apparent velocities on the stochastic response of the bridge has been observed in detail.

关 键 词：大跨斜拉桥 随机地震响应 虚拟激励法 多点激励 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]