长周期地震动作用下斜拉桥粘滞阻尼器减震分析  

Analysis of Damping Effect of Cable-Stayed Bridges Installed with Viscous Dampers Under Long Period Ground Motion

作　　者：陈百奔 冯仲仁[1] 王雄江[1] CHEN Bai-ben;FENG Zhong-ren;WANG Xiong-jiang(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《桥梁建设》2018年第5期75-80,共6页Bridge Construction

基　　金：国家自然科学基金项目(51408449);中央高校基本科研业务费专项资金资助项目(125206004)~~

摘　　要：为研究长周期地震动作用下非线性粘滞阻尼器对大跨径斜拉桥减震效果的影响,以某主跨为926m的双塔斜拉桥为背景进行分析。采用ANSYS建立全桥三维有限元模型,粘滞阻尼器的计算模型采用Maxwell模型,以TCU026(NS)波进行地震动输入,分析在不同的粘滞阻尼器速度指数α与阻尼系数C的组合下,斜拉桥的位移、内力响应及阻尼器的阻尼力情况,并采用二元参数拟合的方法对响应结果进行处理。结果表明:设置非线性粘滞阻尼器能够有效地减小长周期地震动作用下大跨径斜拉桥关键节点的位移;不同的粘滞阻尼器参数组合对斜拉桥结构内力响应影响较大,合理的参数组合能将桥塔塔底剪力的增长幅度控制在可接受的范围内,同时保证塔底弯矩无明显增大现象;在长周期地震动作用下,背景桥梁粘滞阻尼器理想的参数组合为α=0.4、C=2 000kN·(m/s)-0.4。To study the influences of the nonlinear viscous dampers on the damping effect of long span cable stayed bridge under the long period ground motion, a double-pylon cable stayed bridge with the main span of 926 m was cited as an example and was analyzed. The three dimen sional finite element model for the whole bridge of the example bridge was built up by the ANSYS and the Maxwell model was used as the calculation model for the nonlinear viscous dampers. By means of the ground motion input of the seismic wave TCUO26（NS）, the displacement and struc tural internal force responses of the bridge and the damping forces of the dampers under the differ ent combinations of the velocity index α and damping coefficient C were analyzed and the response results were treated by the two parameter fitting method. The results demonstrate that the nonlin ear viscous dampers installed on the bridge can effectively reduce the displacement of the key nodes of the bridge under the long period ground motion. The different parameter combinations of the dampers have great influences on the internal force responses of the bridge. The reasonable parameter combinations can control the increase amplitude of the shear forces of the pylon footings in the acceptable range and at the same time, can ensure that the bending moment of the pylon footings will not notably increase. Under the long period ground motion, the ideal parameter combination of the dampers for the bridge is α=0.4 and C=2 000 kN · （m/s）- 0.4.

关 键 词：斜拉桥 长周期地震动 非线性粘滞阻尼器 减震效果 速度指数 阻尼系数 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]