多维地震激励作用下大跨度斜拉桥的随机响应

英文篇名：Stochastic Response of Long-span Cable-stayed Bridge Under Multi-component Seismic Excitation
中文刊名：武汉理工大学学报
英文刊名：Journal of Wuhan University of Technology
作者：武芳文 ; 薛成凤 ; 赵雷
英文作者：WU Fang-wen1 ; XUE Cheng-feng2 ; ZHAO Lei3(1.School of Highway ; Chang'an University ; Xi'an 710064 ; China ; 2.School of Civil Engineering and Architecture ; Southwest University of Science and Technology ; Mianyang 621010 ; China ; 3.School of Civil Engineering ; Southwest Jiaotong University ; Chengdu 610031 ; China)
中文关键词：桥梁工程 ; 随机响应 ; 斜拉桥 ; 多维激励
英文关键词：bridge engineering ; stochastic response ; cable-stayed bridge ; mutli-component excitation
出版日期：2010-05-15
机构：长安大学公路学院;西南科技大学土建学院;西南交通大学土木工程学院;
年：2010
期：09
出版单位：武汉理工大学学报

摘要

以苏通长江公路大桥为研究对象,采用有限元软件ANSYS建立空间有限元模型,利用子空间迭代法得到结构的自振特性,并基于随机振动理论为基础,对该桥在纵向激励、纵+竖向、纵+横向、纵+竖+横向激励作用下的地震响应进行了对比分析。分析结果表明:在多维随机地震激励作用下,纵向激励效应对结构响应有明显影响,大跨度斜拉桥结构随机振动分析是很有必要考虑3个方向的激励作用。
A 3D finite element model for SuTong Yangtze River Highway Bridge by the software of ANSYS is established.Based on the model and the dynamical equation of MDOF structural system,natural vibration characteristic is obtained by using of subspace iterative method.In addition,3D seismic response is researched by means of the stochastic theory subjected longitudinal excitation,longitudinal and vertical excitation,longitudinal and transverse excitation and 3D excitation.Compared to the seismic response of the bridge by the earthquake excitation,the results show that the effect of longitudinal excitation is notable.It is necessary for the stochastic analysis of long-span cable-stayed bridges to consider three directions excitation.

引文

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