大跨斜拉桥非一致激励地震响应研究

英文篇名：Investigation for Seismic Response of A Long-span Cable-stayed Bridge under Non-uniform Excitation
中文刊名：工程抗震与加固改造
英文刊名：Earthquake Resistant Engineering and Retrofitting
作者：魏德敏 ; 孔鹏 ; 高晓楠
英文作者：Wei De-min1 ; 2 ; Kong Peng1 ; 2 ; Gao Xiao-nan1 ; 2(1.School of Civil Engineering and Transportation ; South China University of Technology ; Guangzhou 510640 ; China ; 2.State Key Laboratory of Subtropical Building Science ; South China University of Technology ; Guangzhou 510640 ; China)
中文关键词：斜拉桥 ; 一致输入地震激励 ; 地震响应 ; 行波效应
英文关键词：cable-stayed bridge ; nonlinear seismic response ; non-uniform excitation ; traveling wave effect
出版日期：2012-02-05
机构：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
年：2012
期：01
出版单位：工程抗震与加固改造

摘要

以海南某拟建斜拉桥为例,计算了该桥的动力特性,分析了该结构在一致输入地震激励和非一致输入地震激励下的非线性地震响应。计算结果表明:与一致输入地震激励下的结构响应相比,在非一致输入地震激励下桥梁结构最大响应值均有不同程度的增大。考虑纵向行波效应时,结构的纵向位移以及关键部位的内力响应值增大,这些响应值将随着地震波波速的提高而减小,并逐步接近一致输入地震激励下的响应值。
In this paper,the dynamic characteristics and the nonlinear seismic responses for the proposed cable-stayed bridge in Hainan Provinec under the uniform earthquake excitation and the non-uniform earthquake excitation are analyzed and computed.Through comparison of the computational results,it is found that the ratio of the torsion frequency and the bending-torsion frequency are high,so the torsion stiffness of this double-cable surface cable-stayed bridge is enough big.The maximum of the responses of the bridge structure under the non-uniform earthquake excitation are bigger than those under the uniform earthquake excitation.If the traveling effect of the longitudinal earthquake wave is considered in the response analyses,the longitudinal displacements and the internal forces in the important parts of the structure would increase.And these responses would decrease and be close to those under the uniform earthquake excitation with the increase of the wave velocity.

引文

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