大跨度高低塔斜拉桥时程地震响应分析

Time-history seismic response analysis of long-span high-low tower cable-stayed bridge

为了研究大跨度高低塔斜拉桥时程地震响应,以榕山长江大桥为工程背景,采用有限元分析软件Midas/civil建立斜拉桥三维分析有限元模型,对有限元模型进行动力特性分析;基于m法模拟桩—土相互作用,利用地震波生成软件按照规范生成地震波选择三条进行斜拉桥地震响应分析。研究结果表明:大跨度高低塔斜拉桥主桥基本自振周期较短;各控制截面内力较小,桥梁抗震性能良好。

In order to study the time-history seismic response of the long-span high-low tower cable-stayed bridge,this paper takes the Rongshan Yangtze River Bridge as the engineering background and uses the finite element analysis software Midas/civil to establish a three-dimensional analysis finite element model of the cable-stayed bridge and analyze the dynamic characteristics of the finite element model;Based on the m method to simulate the pile-soil interaction,using seismic wave generation software to generate seismic waves according to the specification,select three to analyze the seismic response of the cable-stayed bridge.The research results show that the main bridge of the long-span high-low tower cable-stayed bridge has a short basic natural vibration period;the internal force of each control section is small,and the seismic performance of the bridge is good.