布索形式对斜拉桥抗震性能的影响  

Influence of cable arrangement styles on the seismic performance of cable-stayed bridge

作　　者：乔小帅 钟铁毅[1] 杨海洋[1] 梁跃华 孙超 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]航天长征化学工程股份有限公司,北京101111

出　　处：《北京交通大学学报》2014年第3期62-67,共6页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：中国铁路总公司科技研究开发计划项目资助(2014G004-B)

摘　　要：从斜拉桥抗震概念设计的角度出发,对竖琴形、扇形和辐射形三种不同索面布置形式的斜拉桥进行了建模,并对此三种不同模型的动力特性、顺桥向时程响应进行了对比分析.研究结果表明:纵飘振型对斜拉桥的地震响应尤其是塔顶、跨中的位移响应有显著的影响;而斜拉索的顺桥向布置形式对斜拉桥的纵飘周期影响显著,随着主梁与斜拉索平均倾角的减小,纵向刚度逐渐增大,从而纵飘频率增大;索型不同,地震作用下最危险拉索的位置不同.Three different kinds of cable planes including the harp-shape,fan-shape and radial-shape,cable-stayed bridge models are established and the comparative analysis of dynamic characteristics and longitudinal time history responses for the three different models are made.The research results show that the longitudinal seismic response of large span cable-stayed bridge is mainly determined by longitudinal floating vibration mode which plays a decisive role on the displacements of mid-span and tower top,and the arrangement types of cable in the longitudinal have distinctive influence on the period of longitudinal floating vibration mode.In general,with the decreasing of average angle between girder and cables,the longitudinal stiffness increases and the period of longitudinal floating vibration mode decreases.And with the change of cable type,the maximum of cable axial force is quite different.

关 键 词：斜拉桥 布置索形 抗震性能 结构动力特性 地震反应 

分 类 号：TU352[建筑科学—结构工程]