地震作用下不同结构体系斜拉桥的受力性能对比分析  

Comparative Analysis of the Mechanical Performance of Cable-Stayed Bridges with Different Structural Systems under Seismic Action

作　　者：张剑锋 蓝先林 徐向东 唐志[1] 姬同旭 ZHANG Jianfeng;LAN Xianlin;XU Xiangdong;TANG Zhi;JI Tongxu(Guizhou Provincial Transportation Planning,Survey and Design Institute Co.,Ltd.,Guiyang 550081,China)

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,贵阳550081

出　　处：《交通工程》2024年第10期37-42,共6页Journal of Transportation Engineering

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：为探究斜拉桥合理的结构体系,以南水北调桥为工程背景,建立3种不同结构体系斜拉桥的有限元模型,对比研究漂浮体系、半漂浮体系和刚构体系斜拉桥的地震反应谱响应分析,研究横向+竖向、纵向+竖向反应谱下3种结构体系斜拉桥的内力和变形情况,并确定斜拉桥的合理结构体系。研究表明:纵向+竖向地震反应谱下,半漂浮体系斜拉桥的主塔塔顶纵向位移、主梁跨中位移较漂浮体系均有小幅度减小,较刚构体系有所增加,半漂浮体系斜拉桥的主塔塔底内力最小;横向+竖向地震反应谱下,与其他2种结构体系相比,半漂浮体系的塔顶横向位移最小,主梁跨中的竖向位移和横向位移均较小,且主塔的内力响应显著降低,整体上半漂浮结构体系斜拉桥受力性能良好;依据对比分析结果,采用半漂浮体系为斜拉桥最终结构体系。In order to explore the rational structural system of cable-stayed bridges,taking the South-to-North Water Diversion Bridge as the engineering background,the finite element models of cable-stayed bridges with three different structural systems were established,the seismic response spectrum response analysis of cable-stayed bridges with floating system,semi-floating system and rigid system was compared and studied,the internal force and deformation of cable-stayed bridges with three structural systems under the transverse+vertical and longitudinal+vertical response spectrum were studied,and the reasonable structural system of cable-stayed bridges was determined.The results show that under the longitudinal+vertical seismic response spectrum,the longitudinal displacement of the top of the main tower and the mid-span displacement of the main girder of the semi-floating cable-stayed bridge are slightly reduced compared with the floating system,and the internal force of the bottom of the main tower of the semi-floating cable-stayed bridge is the smallest.Under the transverse+vertical seismic response spectrum,compared with the other two structural systems,the lateral displacement of the top of the tower of the semi-floating system is the smallest,the vertical displacement and the lateral displacement of the main beam span are smaller,and the internal force response of the main tower is significantly reduced,and the mechanical performance of the cable-stayed bridge of the semi-floating structural system is good as a whole.According to the results of comparative analysis,the semi-floating system is used as the final structural system of the cable-stayed bridge.

关 键 词：地震反应谱 结构体系 斜拉桥 有限元 受力性能 

分 类 号：U441[建筑科学—桥梁与隧道工程]