摘要
结合一座大跨多塔斜拉桥工程设计实例,分析了桥塔与主梁之间不同约束形式的大跨多塔斜拉桥体系动力特性,对比研究了不同塔、梁间纵向约束方式对结构关键位置地震反应的影响。分析表明,桥塔与主梁间纵向约束方式的设置对结构的动力特性影响很大;在水平和竖向地震作用下,不同桥塔主梁约束形式的结构体系,各桥塔关键位置的内力差异也较大;释放各桥塔、主梁之间的纵向约束,可以减小塔底、承台底的弯矩以及塔底剪力,但会增大由于承台振动对承台底剪力的贡献。
Based on an engineering design case of a multi-tower cable stayed bridge, the dynamic characteristic of the bridge was discussed. The influence of different longitudinal constraint manners settled between tower and beam on seismic responses of the bridge was also discussed. The results indicate that different longitudinal constraint manners between tower and beam have great influence on dynamic characteristics and seismic responses of the bridge. The distribution of internal forces between bottoms of towers...
出处
《结构工程师》
2009年第5期72-77,共6页
Structural Engineers
关键词
多塔斜拉桥
塔梁纵向约束
动力特性
抗震性能
multi-tower cable stayed bridge
longitudinal constraint manner
dynamic characteristic
earthquake resistance of the structure
