宁波甬江铁路斜拉桥的地震位移控制  

Seismic Displacements Control for Yong-jiang Railway CableStayed Bridges Located in Ningbo

作　　者：杨喜文[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2011年第6期78-83,共6页Structural Engineers

摘　　要：大跨度斜拉桥通常采用漂浮体系或半漂浮体系以延长结构的基本周期,从而在强震作用下可以减小结构的地震惯性力,但地震位移较大。以甬江铁路斜拉桥为工程背景,在参数分析的基础上确定了合理的阻尼器参数,研究了粘滞阻尼器在地震位移控制中的作用,并与不设阻尼器的情况进行了比较,结果表明:粘滞阻尼器可以有效控制大跨度斜拉桥的地震位移,改善塔底的地震剪力,明显减小低重心斜拉桥的塔底地震弯矩。Floating or semi-floating systems are usually employed for long-span cable-stayed bridges;these bridges always have longer base periods.Though the earthquake forces of these type cable-stayed bridges are smaller,the seismic displacement is bigger than those with other systems.This paper takes Yong-jiang Railway cable-stayed bridge in Ningbo as an example to study the role of viscous damper in controlling the seismic displacement.The rational parameters of viscous damper were determined after parameter analysis,and then the seismic displacements of the bridge,with or without viscous dampers,were compared.The result showed that viscous damper was efficient in controlling seismic displacement of long-span cable-stayed bridge;the seismic shear forces at bottom of towers were reduced slightly and the seismic moments at bottom of towers were reduced in a larger extent for the cable-stayed bridge with low gravity center.

关 键 词：大跨度斜拉桥 抗震分析 位移控制 参数分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]