结构参数对大跨波形钢腹板箱梁桥动力特性的影响  

Influences of Structural Parameters on Dynamic Characteristics of Long Span Box Girder Bridges with Corrugated Steel Webs

作　　者：桂水荣[1] 张政韬 陈水生[1] GUI Shui-rong;ZHANG Zheng-tao;CHEN Shui-sheng(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013

出　　处：《桥梁建设》2018年第4期39-44,共6页Bridge Construction

基　　金：国家自然科学基金项目(51468018;51268013)~~

摘　　要：为寻求大跨波形钢腹板箱梁桥在保证横向刚度前提下的合理结构参数,对其不同结构参数下的动力特性进行研究。以紫金大桥[(88+156+88)m波形钢腹板组合连续梁桥]为背景,采用ANSYS软件建立全桥有限元模型,研究该桥的动力特性,并分析箱梁截面形式、横隔板布置方式和横向约束方式对其动力特性的影响。结果表明:大跨度波形钢腹板箱梁桥的横向抗弯刚度和抗扭刚度均较低;其他参数相同时,箱室数量对大跨度波形钢腹板箱梁桥的动力特性影响很小;中横隔板对大跨度波形钢腹板箱梁桥的动力特性影响较小,端横隔板能够有效地提高其横向抗弯刚度和抗扭刚度;横向约束方式对大跨度波形钢腹板组合箱梁桥的横向抗弯刚度有显著影响,端部支座的约束效果比中间支座更明显。To seek for the reasonable structural parameters of the long span box girder bridges with corrugated steel webs on the premise that the transverse rigidity of the bridges could be guaranteed,the dynamic characteristics of the bridges under the different structural parameters were investigated.The Zijin Bridge,a continuous composite box girder bridge with the corrugated steel webs and with span arrangement（88＋156＋88）m,was taken as an example and the finite element model for the whole bridge of the bridge was established,using the software ANSYS.The dynamic characteristics of the bridge were studied and the influences of the sectional types of the box girder,arrangement ways of the diaphragms and transverse restraint conditions on the dynamic characteristics were analyzed as well.The results reveal that the transverse flexural rigidity and torsional rigidity of the long span box girder bridges with the corrugated steel webs is low.When the other parameters are the same,the influences of the numbers of the cells and boxes on the dynamic characteristics of the bridges are very little and the influences of the middle diaphragms on the dynamic characteristics are little.The arrangement of the end diaphragms can effectively improve the transverse flexural rigidity and torsional rigidity of the bridges.The transverse restraint conditions have notable influences on the transverse flexural rigidity and the effects of the restraint of the end bearings are more notable than those of the middle bearings.

关 键 词：箱梁桥 波形钢腹板 动力特性 有限元法 横隔板 截面形式 横向约束方式 

分 类 号：U448.213[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]