千岛湖南浦大桥地震响应研究

Study on Seismic Response for Trussed CFST Arch Bridge

以千岛湖南浦大桥为例,研究了钢管混凝土拱桥在地震作用下的动力响应.应用有限元软件MIDAS/Civil建立了有限元模型,采用动态时程分析方法,计算了纵向、横向和竖向地震作用下结构的位移和内力,并考虑了改变地震波输入角度对结构的影响.计算分析表明:该桥梁体系偏柔,需要加强横向刚度,不能忽略竖向地震作用对结构的影响,且需考虑地震波的最不利输入方向,其分析结果可供此类桥的设计与施工参考.

Taking Qiandaohu Nanpu Bridge as an example,this paper studies the seismic response of the concrete filled-steel tubular arch bridge.This paper constructs a finite element model by using finite element software MIDAS/Civil,and then calculates the displacement and internal force of the structure under the longitudinal,transverse and vertical direction seismic wave,meanwhile,discusses the impact on the structure through changing the direction of the longitudinal and transverse seismic waves.The results show that this bridge system is a flexible structure,and the lateral stiffness of the structure should be enhanced,at the same time the most disadvantageous input direction of seismic wave should be considered.