考虑局部拉索振动的斜拉桥抖振响应分析  

BUFFETING ANALYSIS OF CABLE-STAYED BRIDGE IN CONSIDERATION OF CABLES OSCILLATION

作　　者：李晓渝[1] 卢伟[1] 蒋永林[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4期62-64,24,共4页Journal of Vibration and Shock

摘　　要：桥梁结构的抖振响应受抖振力和结构动态特性的影响。在有限元分析中 ,建立结构动态特性矩阵时将斜拉索处理成直杆单元而忽略拉索局部振动的影响。在考虑拉索锚固点随结构运动的情况下 ,推导出斜拉索局部振动引起的拉索动张力公式。分析认为 ,虽然斜拉索的局部振动对结构整体抖振响应的影响不甚显著 。Buffeting response of structure is affected by buffeting loads and dynamic characteristics of structure. When finite element method is adopted, the characteristic matrix of the structure is usually constructed, looking one cable as one element and neglecting the oscillation of the cables. When movements at two ends of cable are considered, its dynamic tension equation due to oscillation is derived. The results show that the oscillations of cables have little effect on the buffeting response of the whole structure. However, the effect of the whole structure movement on the local vibration of cables is just significant.

关 键 词：斜拉桥 斜拉索 抖振响应 有限元 局部振动 抖振力 时程模拟 

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