斜拉桥抖振动力可靠性分析  

DYNAMIC RELIABILITY ANALYSIS FOR BUFFETING OF CABLE_STAYED BRIDGE

作　　者：卢伟[1] 强士中[1] 李晓渝[1] 

机构地区：[1]西南交通大学桥梁及结构工程系,成都610031

出　　处：《振动与冲击》2001年第2期82-85,共4页Journal of Vibration and Shock

摘　　要：本文针对大跨度斜拉桥的特点 ,考虑了振型间的耦合效应 ,采用目标谱显式分解技术与动力增量平衡迭代算法分析大桥的抖振响应。在此基础上 ,采用首次超越破坏机制 ,考虑了大跨度斜拉桥抖振响应的动力可靠性问题。最后 ,以文中方法验算了某斜拉桥主梁的抗风动力可靠性。Considering the characteristics of long-span cable-stayed bridge, the explicit decomposition technique for the wind velocity spectrum density matrix and the dynamic increment equilibrium iteration method are proposed to fulfill the time history analysis of the bridge buffeting response. On the basis of the results, the first excursion mechanism is adopted to analyze the dynamic reliability for buffeting of long-span cable-stayed bridge. Numerical example is presented to show the advantage of this method and to verify the dynamic reliability of a cable-stayed bridge under wind-loads.

关 键 词：斜拉桥 抖振动 动力可靠性 结构动力学 频域分析 时域分析 随机振动 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]