利用阻尼型辅助索的斜拉索减振试验研究  

VIBRATION MITIGATION OF STAY CABLES USING CROSS-TIES WITH DAMPERS

作　　者：何永龙[1] 孙利民[1] 周亚刚[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：《工程力学》2010年第A02期259-262,共4页Engineering Mechanics

基　　金：国家自然科学基金项目(50678123)

摘　　要：辅助索是控制超长斜拉索振动的有效措施,该文通过试验验证阻尼型辅助索对索网结构的减振效果。对具有不同数量、位置、阻尼系数阻尼器的辅助索工况进行了研究,试验模型由三根斜拉索和一根辅助索组成,通过人工激励使拉索产生一定幅值的振动,采集索网自由振动时程,进行频谱分析、滤波及线性拟合分析处理得到索网的模态阻尼。试验结果表明:索网结构低阶振动呈整体振型;Cross-tie is an effective measure to control vibration of long stay cables.Experimental studies are carried out to verify the damping effect of cross-ties with dampers in this paper,considering different number,position and damping coefficient of the cross-ties dampers.The tested model consists of three stay cables and one cross-tie.The cables were excited to certain amplitude of vibration,and then the free vibration time histories of the cables were recorded.The additional modal damping was calculated from the experimental data.The results show that： the cable network vibrates mainly in the global mode;the cross-tie with dampers can effectively improve the structural damping of cables,and the damping effect increases with the damping number and depends on the allocation and damping coefficients of the cross-tie dampers.

关 键 词：阻尼型辅助索 减振 试验 索网结构阻尼 参数分析 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]