双边箱主梁斜拉桥结构体系的地震响应研究  

Study on Seismic Response of Bilateral Box Main Girder Cable-stayed Bridge

作　　者：张剑锋 刘国盼 朱丹丹 蓝先林 姬同旭 ZHANG Jian-feng;LIU Guo-pan;ZHU Dan-dan;LAN Xian-lin;JI Tong-xu

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550081

出　　处：《内蒙古公路与运输》2024年第6期31-36,共6页Highways & Transportation in Inner Mongolia

基　　金：贵州省重大科技专项基金项目(黔科合重大专项[2016]3013)。

摘　　要：为探究双边箱主梁斜拉桥在三向地震作用下的结构响应,文章以南水北调桥为依托,采用MIDAS/Civil有限元分析软件,并结合地震时程分析法,开展了双边箱主梁斜拉桥的地震响应研究,主要研究三向地震作用下斜拉桥主梁内力及拉索索力的变化规律。结果表明:三向地震作用下,半漂浮体系斜拉桥的主梁跨中弯矩最大,梁端内力较小;刚构体系斜拉桥除主梁跨中弯矩较小,主梁的梁端和跨中其他内力均最大;漂浮体系斜拉桥主梁跨中和梁端的整体内力响应均较小;漂浮体系斜拉桥的拉索索力最大,半漂浮和刚构体系斜拉桥的拉索索力相差较小,且均比漂浮体系拉索索力减小超过50%以上;施加地震作用前后,漂浮体系斜拉桥拉索索力的变化较大,施加地震后的索力增加20%以上,半漂浮体系斜拉桥的拉索索力变化在2%左右,刚构体系的拉索索力变化在5%左右;依据分析结果,选择半漂浮体系斜拉桥为最终桥梁结构体系。In order to explore the structural response of bilateral box main girder cable-stayed bridge under the three-way seismic action,this paper takes the South-to-North Water Transfer Bridge as the basis,uses MIDAS/Civil finite element analysis software,and combines the seismic time history analysis method to carry out the seismic response study of the bilateral box main girder cable-stayed bridge.The main research is on the variation law of the internal force and cable force of the main girder cablestayed bridge under the three-way seismic action.The results shows that under the action of three-way earthquake,the main girder of the semi-floating cable stayed bridge has the largest bending moment in the span and the internal force at the beam end is small.In addition to the small bending moment in the span of the main beam,the beam end and other internal forces of the main beam are the largest.The overall internal force response of the main beam span and beam end of the cable-stayed bridge of the floating system is small.The cable force of the cable-stayed bridge of the floating system is the largest,and the cable force difference between the cable-stayed bridge of the semi-floating and rigid system is small,and the cable force is reduced by more than 50%compared with that of the floating system.Before and after the application of seismic action,the cable force of the cable-stayed bridge of the floating system changes greatly,and the cable force increases by more than 20%after the earthquake.The cable force cable-stayed bridge of the semi-floating system changes by about 2%,and the cable force of the rigid system changes by about 5%.According to the analysis results,the semi-floating cable-stayed bridge is selected as the final bridge structural system.

关 键 词：双边箱 地震响应 斜拉桥 三向地震作用 斜拉索 内力 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]