剪力连接程度对冷弯U型组合梁抗弯承载力影响  

Influence of shear connection degree on the bending load capacity of cold-formed U-shaped composite girders

作　　者：林彦军 张泽军 张田涛 LIN Yanjun;ZHANG Zejun;ZHANG Tiantao(Shandong Luqiao Group Co.,Ltd.,Jinan 250013,China;Innovation Research Institute,Shandong Hi-Speed Group Co.,Ltd.,Jinan 250014,China;Shandong Hi-Speed Infrastructure Construction Co.,Ltd.,Jinan 250000,China)

机构地区：[1]山东省路桥集团有限公司,山东济南250013 [2]山东高速集团有限公司创新研究院,山东济南250014 [3]山东高速基础设施建设有限公司,山东济南250014

出　　处：《山东交通学院学报》2025年第1期35-42,52,共9页Journal of Shandong Jiaotong University

基　　金：山东省交通运输科技计划项目(2022B64)。

摘　　要：为研究剪力连接程度对U型组合梁抗弯承载力的影响,根据剪力连接程度、剪力钉数、剪力钉间距等影响因素设计完成8组数值模型试验,采用验证后的有限元模型计算分析应变和挠度,根据中国、欧洲和美国等不同规范,分别计算完全剪力连接条件下所需最少剪力钉数。结果表明:数值有限元模型能较好地模拟U型组合梁受力全过程中钢主梁和混凝土桥面板的应力及变形情况,实测结果与数值模拟计算结果相对差小于15%;剪力连接程度系数为0.02~0.30时,随剪力连接程度系数的增大,跨径16 m的U型组合梁的抗弯承载力不断增大,当剪力连接程度系数为0.30时,钢梁和混凝土已达到完全剪力连接,剪力连接程度系数大于0.30时,U型组合梁的抗弯承载力变化不大;U型组合梁抗弯承载力在弹性阶段的变化规律受剪力连接程度影响相对较小,工程应用中采用部分剪力连接可行,塑性阶段受剪力连接程度影响相对较大,U型组合梁抗弯承载力的计算与验算应计入剪力连接程度的影响;不同规范计算的完全剪力连接条件下所需最少剪力钉数较接近。To study the effect of shear connection degree on the bending capacity of U-shaped composite beams,eight groups of numerical model experiments are designed based on factors such as shear connection degree,number of shear studs,and spacing of shear studs.A validated finite element model is used to calculate and analyze the strain and deflection.According to different codes from China,Europe,and the United States,the minimum number of shear studs required under fully shear-connected conditions is calculated separately.The results indicate that the numerical finite element model can effectively simulate the stress and deformation of the steel main beam and concrete deck slab throughout the loading process of the U-shaped composite beam,with the error between the measured results and numerical simulation results being less than 15%.When the shear connection degree coefficient is between 0.02 and 0.30,the bending capacity of the U-shaped composite beam with a span of 16 m continuously increases as the shear connection degree coefficient increases.When the coefficient reaches O.30,the steel reinforcement and concrete have achieved full shear connection;beyond a coefficient of 0.30,the bending capacity of the U-shaped composite beam shows lttle variation.The variation of the bending capacity in the elastic stage is relatively less affected by the shear connection degree;partial shear connection is feasible in engineering applications.In the plastic stage,the bending capacity is significantly influenced by the shear connection degree,and the calculation and verification of the bending capacity of the U-shaped composite beam should account for the effect of shear connection degree.The minimum number of shear studs required under fully shear-connected conditions calculated by different codes is relatively close.

关 键 词：U型组合梁 抗弯承载力 数值模型试验 剪力连接程度系数 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U443.35[交通运输工程—道路与铁道工程]