叠合梁局部梁段施工及运营过程受力性能研究  

Study of Load Bearing Behavior of Local Composite Girder in Construction and Service Stages

作　　者：黄继荣 纪键铱 马牛静 王荣辉[1,2] HUANG Ji-rong;JI Jian-yi;MA Niu-jing;WANG Rong-hui(Guangzhou Traffic Project Management Center, Guangzhou 511045, China;School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China)

机构地区：[1]广州市中心区交通项目管理中心,广东广州511045 [2]华南理工大学土木与交通学院,广东广州510641

出　　处：《世界桥梁》2021年第5期59-65,共7页World Bridges

基　　金：国家自然科学基金项目(51878295);广东省自然科学基金项目(2021A1515012405);广州市珠江科技新星项目(201906010009)。

摘　　要：为了解叠合梁斜拉桥施工及运营阶段叠合梁的受力性能,以广州市新建洛溪大桥为背景(主跨305 m的叠合梁斜拉桥,桥面板与钢梁通过剪力钉连接)进行研究。采用MIDAS软件建立全桥梁单元模型,对施工以及运营阶段进行模拟,分析全过程结构受力和位移,提取叠合梁段受力最不利工况;采用Abaqus软件建立叠合梁局部梁段精细化模型,分析最不利工况下钢混界面处剪力钉的受力状态。结果表明:桥梁边跨辅助墩墩顶主梁存在较大负弯矩区,在运营阶段边跨辅助墩(5号墩)墩顶负弯矩达30209.6 kN·m;剪力在梁截面横向分配不均匀,钢梁腹板以及加劲肋位置处剪力钉受力相对较大;运营阶段剪力钉出现最大剪力37.1 kN,小于容许值50.1 kN,在施工和运营全过程叠合梁钢混界面剪力钉受力安全。The newly-built Luoxi Bridge in Guangzhou is applied as a case to study the load bearing behavior of the composite girder cable-stayed bridge in construction and service stages.The bridge is a composite girder cable-stayed bridge with a main span of 305 m,and the deck slabs are connected with the steel girder via shear studs.The beam element model of the overall bridge was established by MIDAS to simulate the construction and service stages,analyze the load bearing behavior and displacement of the structure in the whole process,and extract the most adverse load cases of the composite girder.Abaqus was used to establish the refined model of local section of the composite girder to analyze the load bearing behavior of shear studs in the steel-concrete interface under the most unfavorable loading conditions.The results show that large negative moment zones exist in the section of main girder atop auxiliary piers in the side spans,in the service stage,the negative moment zone atop the auxiliary pier(pier No.5)reached 30209.6 kN·m.Due to that shear forces were not uniformly distributed in the cross-section of the main girder in the transverse direction,the shear studs in the webs and stiffeners of the steel girder carried relatively greater forces.The maximum shear force of the shear studs occurred in the service stage,being 37.1 kN,which is less than the allowable value of 50.1 kN,proving that the shear studs in steel-concrete interface of the composite girder are in safe loading condition in both the construction and service stages.

关 键 词：叠合梁 剪力钉 负弯矩区 施工阶段 运营阶段 受力性能 梁段精细化模型 有限元法 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]