考虑界面滑移效应的波形钢腹板箱梁解析解  

Analytical Solutions for Box-girder with Corrugated Steel Webs Considering Interface Slip Effect

作　　者：许晶[1] 郑智仁 孔华辉 何桂峰 XU Jing;ZHENG Zhi-ren;KONG Hua-hui;HE Gui-feng(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;Poly(Gansu)Industrial Investment Co.,Ltd,Lanzhou 730070,Gansu,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]保利(甘肃)实业投资股份有限公司,甘肃兰州730070

出　　处：《建筑科学与工程学报》2022年第6期94-101,共8页Journal of Architecture and Civil Engineering

基　　金：北京市自然科学基金项目(8214051);国家自然科学基金区域创新发展联合基金项目(U20A2020)。

摘　　要：为研究界面滑移效应对改进型波形钢腹板箱梁的影响,考虑腹板剪切变形及截面轴力自平衡条件建立了组合箱梁桥的控制微分方程,进而推导出简支箱梁的滑移位移函数和翼缘板最大纵向位移差函数表达式。以受均布荷载的改进型波形腹板组合箱梁为算例,基于箱梁荷载工况和边界条件,得到了组合箱梁桥挠度、上下翼缘板截面正应力和剪滞系数表达式。利用有限元软件,通过在翼缘和腹板间添加弹性连接单元模拟滑移效应,验证提出的理论方法的正确性。最后,采用推导的理论公式研究了剪切抗滑移刚度对组合箱梁桥截面正应力、剪滞系数和挠度的影响规律。结果表明:理论解与有限元模拟结果吻合较好,提出的理论公式可用于结构设计或软件开发;剪切抗滑移刚度对组合箱梁翼缘截面正应力及挠度影响较大;在均布荷载作用下,与不考虑滑移效应相比,考虑滑移效应后的上翼缘截面正应力减小7.44%,下翼缘截面正应力增大6.79%,箱梁桥跨中挠度增大8.8%;剪切抗滑移刚度对组合箱梁翼缘板剪滞系数的影响较小,影响幅度在1%以内。In order to analyze the interface slip effect on improved box girder with corrugated steel webs,considering the shear deformation of the web and the self balance condition of the section axial force,the governing differential equation of composite box girder bridge was established.The expressions of slip displacement function and flange slab maximum longitudinal displacement difference of simply supported box girder were derived.Taking an improved composite box girder with corrugated webs subjected to uniform load as an example,based on the box girder load conditions and boundary conditions,the theoretical equations for the deflection of composite box girder bridge,cross section normal stress and shear lag coefficient of upper and lower flange slab were derived.By adding the elastic connection unit between flange and web to simulate interface slip effect in the finite element software,the correctness of the proposed theoretical methods was verified.Finally,the influence of shear slip stiffness on cross section normal stress,shear lag coefficient and deflection of composite box girder bridge were studied by using the derived theoretical formula.The results show that the theoretical formula is in good agreement with the finite element simulation results,and the proposed formulas can be used in the bridge design or software development.The interface slip stiffness has great influence on the cross section normal stress and deflection of flange of the composite box girder.Under the action of uniform load,compared with that without considering slip effect,the normal stress of upper flange section after considering slip effect decreases by 7.44%,the normal stress of lower flange section increases by 6.79%,and the mid-span deflection of box girder increases by 8.8%.The influence of slip stiffness on the shear lag coefficient of composite box girder flange slab is small,and the influence range is within 1%.

关 键 词：波形钢腹板箱梁 界面滑移效应 剪滞效应 能量变分法 挠度 

分 类 号：TU311[建筑科学—结构工程]