赣江二桥主桥地震反应分析  

Seismic Response Analysis of Main Bridge of Second Ganjiang River Bridge

作　　者：王毅[1] 

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2014年第7期166-168,173,共4页Urban Roads Bridges & Flood Control

摘　　要：我国现行桥梁抗震设计规范未对钢混组合斜拉桥明确其阻尼比的取值,并且对所有振型阻尼比取为相同常数。该文以独塔斜拉桥赣江二桥主桥为对象,对不同常数阻尼比下反应谱分析结果进行比较,说明结构阻尼比对结构地震反应的影响程度,提出了用瑞利阻尼进行动力时程分析以校核动力分析结果的方法,为类似的钢混组合斜拉桥抗震分析提供参考。In current code for bridge seismic design of China, the damping ratio is not specified for steel-concrete composite cabled-stayed bridge, and identical constant is assigned to damping ratio for all the modes. For the main bridge of single-pylon cable-stayed bridge- Second Ganjiang Bridge, the article compares the results from response spectrum analysis with different constant damping ratio, describes the impact to structure response in seismic event due to damping ratio, and proposes an approach to verify dynamic analysis results with the Rayleigh damping force in dynamic time-history analysis, which can be referred for the seismic analysis of the similar steel-concrete composite cable-stayed bridges.

关 键 词：斜拉桥 动力特性 反应谱 时程分析 阻尼比 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]