铁路刚构-连续混合梁桥钢-混结合段合理构造参数研究  

Research on Reasonable Structural Parameters in Steel-Concrete JointSection of Railway Hybrid Girder Rigid Frame-Continuous Bridge

作　　者：蒲黔辉[1] 谢自畅 杨仕力 黄胜前[1] 杨朝龙[2] 洪彧[1,3] PU Qianhui;XIE Zichang;YANG Shili;HUANG Shengqian;YANG Chaolong;HONG Yu(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]西南交通大学陆地交通地质灾害防治技术国家工程实验室,成都611756

出　　处：《铁道标准设计》2022年第1期79-84,共6页Railway Standard Design

基　　金：国家重点研发计划项目(2017YFC0806007);中铁第四勘察设计院集团有限公司科技研究开发项目(2019K002)。

摘　　要：以主跨216 m杭温铁路永嘉右行线跨甬台温特大桥为背景,研究铁路钢-混结合段的力学性能及传力机理,并讨论该桥钢混结合段的合理构造参数。采用ANSYS软件建立其钢-混结合段局部有限元模型,分析结合段中钢与混凝土内力的分配情况,并对影响其传力分配的构造参数进行探讨。结果表明:结构纵向受力板件处于受压状态,钢梁应力沿结合段逐渐减小;承压板分担轴力比例约为56.2%,随着承压板厚度增加,其分担荷载比例也有提高,承压板厚度在40~60 mm之间时提高较快,承压板厚度大于60 mm后提高不明显;钢梁埋入段长度大于2.5 m后,对传力效果的影响不大;剪力钉刚度的增加会显著提高其承担的顺桥向剪力,并增加剪力沿横桥向分布的不均匀性。To investigate the force transfer mechanism and mechanical performance of the steel-concrete joint section of railway bridge,the Yongjia Right Line of Hangzhou-Wenzhou railway across Ningbo-Taizhou-Wenzhou Bridge with a main span of 216 m is referenced to study the reasonable parameters of the section.The software ANSYS is used to establish the finite element model for the steel-concrete joint section to analyze the axial force distribution of the steel and concrete of the joint section,and those structural parameters that influence the force distribution are discussed as well.The results show that the structural longitudinal force-bearing plates are in the compression state,and the stress of steel girder decreases towards the longitudinal direction of the joint section.The ratio of the axial force shared by the bearing plate is about 56.2%,and as its thickness increases,the ratio will also increase and grow faster between 40~60mm.However,when the thickness is greater than 60mm,the increase is not obvious.The embedded length of steel girder larger than 2.5 m has negligible effects on the load transferring efficiency.The increment in the stiffness of the shear studs will significantly increase the shear force they bear along the bridge and increase the uneven distribution of the shear force along the transverse bridge.

关 键 词：铁路桥 刚构-连续梁 钢-混结合段 有限元法 参数分析 传力机理 

分 类 号：U448.23[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]