铁路悬索桥纵向非一致激励地震响应分析  

Seismic responses analysis of a railway suspension bridge under longitudinal non-uniform excitations

作　　者：杨海洋[1] 钟铁毅[1] 夏禾[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2014年第22期157-163,共7页Journal of Vibration and Shock

基　　金：铁道部科技研究开发计划(2010G004-I);国家重点研究计划"973"项目(2013CBO36203)

摘　　要：以某三跨铁路悬索桥为例,基于大型通用有限元软件ANSYS,采用行波输入与多点激励两种非一致地震激励进行铁路悬索桥地震响应计算分析。研究获得大跨度悬索桥在非一致激励输入下响应变化规律,并通过分析桥梁各响应控制振型变化获得非一致激励对桥梁地震响应影响机理,从而揭示两种非一致激励考虑方式对桥梁响应影响的根本区别,为悬索桥非一致激励下地震响应计算分析提供重要参考依据。Based on the general finite element software ANSYS,seismic responses under non-uniform excitations of a long-span railway suspension bridge were studied.Two different input methods,i.e.,traveling seismic wave excitation and multi-support excitation,were used to analyze the seismic responses of the bridge,and then the response regulations were discussed.Analysing the differences between the response control modes,the influence mechanisms of the non-uniform excitations were discussed,thus the fundamental differences between effects of the two input methods were revealed.The results can provide an important basis for the seismic analysis of suspension bridges.

关 键 词：悬索桥 非一致激励 控制振型 行波效应 多点激励 

分 类 号：U24[交通运输工程—道路与铁道工程]