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.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第9期344-347,共4页
Journal of Wuhan University of Technology
基金
中央高校基本科研业务费专项资金(CHD2009JC043)
长安大学基础研究支持计划专项基金
关键词
桥梁工程
随机响应
斜拉桥
多维激励
bridge engineering
stochastic response
cable-stayed bridge
mutli-component excitation
作者简介
武芳文（1980-），男，博士，讲师．E-mail：wufangwen2004@163．com
