结构参数对双链式悬索桥地震响应的影响  

Effect of structural parameters on seismic response of a double cables suspension bridge

作　　者：丁南宏[1,2] 林丽霞[1] 钱永久[2] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《世界地震工程》2011年第4期156-161,共6页World Earthquake Engineering

基　　金：甘肃省自然科学基金(2008GS02604);兰州交通大学"青蓝"基金(QL-05-13A)

摘　　要：以某双链式悬索桥为工程背景,建立了空间有限元计算模型。运用几何非线性时程分析方法,分析并探讨了不同垂跨比、阻尼比,塔桥不同连接方式和双链位置对双链式悬索桥地震响应的影响。分析表明,竖向地震动分量使桥塔轴力迅速增大,加劲梁采用钢筋混凝土边梁可有效减小地震响应;塔梁间采用简支连接方案其抗震性能比固定支座连接方案、滑动支座连接方案要好;双链式悬索桥横向抗震性能优于单链式悬索桥。对双链式悬索桥抗震性能的研究,为此类悬索结构的设计选型,乃至减震、隔震及抗震加固提供了参考。Taking a double cables suspension bridge as engineering background,a three-dimensional finite element model was established.Considering different sag ratios and damping ratios,different connection between stiffening girder and tower,and different location of double cales the seismic response of the double cables suspension bridge was analyzed and discussed by geometric nonlinear time history analysis method.The results show that vertical ground motion component make the axial force of bridge tower increases rapidly,and the stiffening girder using reinforced concrete edge beam can effectively reduce the seismic response;the seismic performance of simply supported connection scheme is better than both of the fixed bearing connection and sliding bearing connection schemes;the horizontal seismic performance of the double cables suspension bridge is better than that of single cables suspension bridge.The study of the seismic response characteristics of the double cable suspension bridge give a reference to structural form selection of such type bridge during designing,as to well as shock absorption,vibration isolation,and anti-seismic retrorit design.

关 键 词：双链式悬索桥 地震 时程分析 垂跨比 阻尼 主缆形状系数 

分 类 号：U441[建筑科学—桥梁与隧道工程]