大跨度独塔自锚式悬索桥减隔震措施  

Seismic response reduction measurement of long-span self-anchored suspension bridges with single-tower

作　　者：杨孟刚[1] 陈国阳[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2010年第3期16-19,共4页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(50908231)

摘　　要：为了减小大跨度自锚式悬索桥在地震作用下的主梁纵向位移,以某主跨350 m的独塔自锚式悬索桥为研究对象,建立Midas空间动力有限元模型,进行动力特性分析,研究在实桥地震波一致激励作用下,铅芯橡胶支座和黏滞阻尼器2种减震措施的减震效果。研究结果表明:通过在桥墩设置铅芯橡胶支座或在塔梁间纵向设置黏滞阻尼器可以有效减小自锚式悬索桥的纵向位移响应。In order to reduce the main girder＇s longitudinal displacement of long-span self-anchored suspension bridge under the earthquake,the midas three-dimensional dynamic finite element model of a single tower self-anchored suspension bridge with main span of the 350 m was established,and the dynamic characteristics were analyzed.Furthermore,the seismic response reduction effects of two measures,i.e.,the lead rubber bearings and the viscous dampers,under the real bridge seismic wave were investigated.The results show that the longitudinal displacement responses of self-anchored suspension bridge can be effectively mitigated by the lead rubber bearings placed on the piers or by the viscous dampers placed between the main tower and the main girder in the longitudinal direction.

关 键 词：自锚式 悬索桥 减震 铅芯橡胶支座 黏滞阻尼器 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]