独塔混合梁斜拉桥阻尼器参数敏感性分析  

Sensitivity Analysis of Damper Parameters for SinglePylon Hybrid Beam Cable-Stayed Bridges

作　　者：黄民水 王琛 卢海林 HUANG Min-shui;WANG Chen;LU Hai-lin(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430073,China;School of Transportation,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,湖北武汉430073 [2]武汉理工大学交通学院,湖北武汉430063

出　　处：《桥梁建设》2018年第3期35-39,共5页Bridge Construction

基　　金：国家留学基金项目(201508420074);国家自然科学基金项目(51378404)~~

摘　　要：为研究阻尼器参数对独塔混合梁斜拉桥关键节点位移和关键截面内力的影响规律,获得最优阻尼参数组合及其减震效果,以某主跨260m的铁路独塔混合梁斜拉桥为工程背景,对阻尼器力学参数进行研究。采用MIDAS Civil软件建立全桥结构地震响应模型,在塔梁交接处设置2个粘滞阻尼器,考虑桩-土相互作用,选择合适的地震时程函数,进行了阻尼器参数敏感性分析。结果显示:阻尼指数α和阻尼系数C对独塔混合梁斜拉桥关键节点位移、关键截面内力的影响呈相反趋势;该桥最佳阻尼器参数组合为α=0.3和C=4 000kN/(m/s)α;设置粘滞阻尼器后,桥塔塔顶位移、钢-混结合部位移和主梁梁端位移分别减小了69.8%、72%和72.9%,桥塔塔底截面弯矩减小了16.34%。To study the influence rules of the damper parameters on the key node displacement and key section internal forces of single-pylon hybrid beam cable-stayed bridges and to obtain the optimal damping parameter combination and its seismic reduction effect,an actual railway singlepylon hybrid beam cable-stayed bridge with a main span of 260 m was cited as an example and the sensitivity analysis on the mechanical parameters of the dampers was carried out.The seismic responses of the whole bridge structure were modelled by the MIDAS Civil,two viscous dampers were installed in the intersection of the pylon and main girder and the pile-soil interaction was also considered.The appropriate seismic time functions were selected and the sensitivity analysis of the damping parameters was carried out.The results show that the influences of the damping indices and damping coefficients on the key node displacement and key section internal forces of the singlepylon hybrid-beam cable-stayed bridge are opposite.The optimal damper parameters areα=0.3 and C=4 000 kN/（m/s）α,the longitudinal displacement at the top of the pylon,the composite joint of the steel-concrete,the end of the main girder and the bending moment at the bottom of the pylon decrease by 69.8%,72%,72.9%,16.34%respectively with the viscous dampers being installed.

关 键 词：斜拉桥 混合梁 粘滞阻尼器 有限元法 阻尼器参数 平均减震率 敏感性分析 

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]