铁路混合梁钢-混结合段受力及理论计算  

STRESS BEHAVIOR AND THEORETICAL CALCULATION OF STEEL-CONCRETE JOINT OF RAILWAY HYBRID GIRDER

作　　者：施洲[1] 张莹 李英铭 何知明 时均伟 SHI Zhou;ZHANG Ying;LI Ying-ming;HE Zhi-ming;SHI Jun-wei(School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Hanbanan Intercity Railway Co.,Ltd.,Bazhong,Sichuan 636099,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]汉巴南城际铁路有限责任公司,四川巴中636099

出　　处：《工程力学》2024年第S01期282-291,共10页Engineering Mechanics

基　　金：蜀道投资集团科技计划项目(SRIG2020GG0001);中国铁路总公司科技研究开发计划重点课题项目(AJZH2020-001)。

摘　　要：为研究铁路混合梁钢-混结合段结构的受力及其理论计算公式,在既有公路桥梁钢-混结合段计算公式的基础上,提出铁路混合梁钢-混结合段截面应力、顶底板剪力连接件、承压板传力验算公式;并以主跨335 m汉巴南铁路嘉陵江特大桥为研究背景,采用有限元分析的方法探究结合段受力特性及应力纵、横向分布规律,进而开展结合段受力理论与数值计算对比分析。数值计算结果表明,结合段混凝土均处于受压状态,不同截面位置处结合段钢、混应力横向分布均存在一定的不均匀性。公式验算结果表明:结合段混凝土应力均受压,满足截面应力验算要求;剪力连接件的抗力系数介于1.30~4.49,结合段剪力连接件具有良好的安全储备;承压板抗力系数介于3.18~10.08,表明前后承压板抗力远大于计算传力荷载,并具有优化的空间。理论公式计算的结合段顶底板混凝土应力、剪力钉应力与有限元计算结果总体相近,在修正后可用于钢-混结合段的防开裂/脱离、抗剪受力计算。To study the stress characteristics and theoretical calculation formulas of the steel-concrete joint of railway hybrid girder,based on the existing calculation formulas of steel-concrete joint of highway bridges,the checking formulas for joint stress,shear connectors of top and bottom plates and load transmission of bearing plate of railway hybrid girders were put forward.Taking the Jialing River Bridge of Hanzhong to Bazhong&Nanchong Railway with a main span of 335 m as the research background,a finite element analysis(FEA)was conducted to explore the stress characteristics and the longitudinal and lateral stress distribution law of the joint,and then a comparative analysis was done between the formula and FEA.The FEA results show that the lateral stress distributions of steel and concrete of the joint at different cross-section are all uneven.The formula verification results indicate that the concrete of the joint is in compressive,meeting the requirements on section stress.The shear connector resistance coefficient ranges from 1.30 to 4.49,indicating adequate safety reserves.The resistance coefficient of bearing plates is between 3.18 and 10.08,showing that the resistance of front and rear bearing plates is much greater than the calculated load,and there is a room for optimization.The stresses of concrete and shear connectors on the top and bottom of the joint calculated by theoretical formula are generally similar to FEA results and can be used to calculate the anti-cracking/detachment and shear stress of steel-concrete joint after modification.

关 键 词：铁路混合梁 钢-混结合段 受力理论 剪力键 承压板 

分 类 号：U441[建筑科学—桥梁与隧道工程]