考虑阻尼值修正的双链式悬索桥地震响应分析  

Seismic response analysis of double chains suspension bridge considering modified damping value

作　　者：林丽霞[1] 丁南宏[1] 张元海[1] 吴亚平[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《铁道科学与工程学报》2012年第5期25-30,共6页Journal of Railway Science and Engineering

基　　金：甘肃省自然科学基金资助项目(1107RJZA122);甘肃省财政厅资助项目(620029)

摘　　要：基于复阻尼理论求解等效粘滞阻尼比,以近似描述非经典阻尼体系的阻尼耗能特性,提出了考虑实测阻尼值修正的具有非经典阻尼特性的双链式悬索桥地震响应分析方法。结合一双链式悬索桥,对比分析经典阻尼及非经典阻尼对双链式悬索桥地震响应的影响。研究结果表明:非经典阻尼对双链式悬索桥的地震响应有明显的影响,用经典阻尼模型得不出可靠的解,双链式悬索桥的地震响应分析,应当使用非经典阻尼模型;在初步分析时,纵、竖向地震下非经典阻尼体系的地震响应可分别按全桥混凝土桥塔阻尼比、钢加劲梁阻尼比计算结果代替,以简化计算。Based on the complex damping theory to get the equivalent viscous damping ratio, which was used to describe energy dissipation characteristics of non - classical damping system approximately, a method was proposed to analyze seismic response of double chains suspension bridge considering non- classical damping modified by measured value. Through an example of double chains suspension bridge, the influence of different damping forms on seismic response of double chains suspension bridge was analyzed, which considering classical damping and non - classical damping respectively. The results show that non - classical damping has a significant effect on the seismic response of double chains suspension bridge, and response based on the classical damping model is not reliable. Non - classical damping model should be used in seismic analysis of double chains suspension bridge, however, the seismic response of non - classical damping system under the longitudi- nal or vertical seismic wave can be substituted approximately by the seismic response calculated according to damping ratio of concrete tower and steel stiffening girder respectively, which can simplify the calculation during preliminary analysis.

关 键 词：双链式悬索桥 地震响应 非经典阻尼 等效粘滞阻尼比 反应谱 时程分析 

分 类 号：U441[建筑科学—桥梁与隧道工程]