汽车荷载作用下斜拉桥结构体系力学性能分析  

Analysis of Mechanical Properties of Cable-Stayed Bridge Structural System Under Vehicle Load

作　　者：张剑锋 姬同旭 陈权川 蒙磊 傅学军[1] 余崇俊[1] ZHANG Jianfeng;JI Tongxu;CHEN Quanchuan;MENG Lei;FU Xuejun;YU Chongjun(Guizhou Provincial Transportation Planning,Survey and Design Research 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》2023年第4期123-128,共6页Journal of Transportation Engineering

摘　　要：为探究汽车活载作用下,斜拉桥结构体系的变化对主塔、主梁以及拉索的响应,以南水北调桥为背景,采用midas有限元建立全桥模型,分析了漂浮体系、半漂浮体系和刚构体系斜拉桥的塔梁位移、内力响应,以及斜拉索索力响应.研究结果表明,在汽车活载作用下,3种结构体系斜拉桥的主梁弯矩相差较小;刚构体系斜拉桥的梁塔位移均减小,主塔塔底弯矩增大;刚构体系斜拉桥的最短拉索索力大幅减小,最长拉索索力减小较少,刚构体系可增加最短拉索的抗疲劳性能.In order to explore the response of the structural system changes of the cable-stayed bridge to the main tower,main girder and stay cables under the action of vehicle live load,taking the South-to-North Water Diversion Bridge as the background,the midas finite element model was used to establish the full bridge model.The floating system,and the semi-floating system were analyzed.The tower girder displacement,internal force response,and cable force response of the cable-stayed bridge of the floating system and the rigid-frame system were investigated.The research results show that the main girder bending moment of the cable-stayed bridge with the three structural systems had a small difference under the action of the vehicle live load.As the displacement of the beam and tower of the rigid-frame system cable-stayed bridge decreases,the bending moment at the bottom of the main tower increases.Therefore,the structural system can increase the fatigue resistance of the shortest cable.

关 键 词：双边箱斜拉桥 结构体系 力学性能 

分 类 号：U441[建筑科学—桥梁与隧道工程]