钢底板-波形钢腹板组合箱梁剪力滞效应分析  

Analysis of Shear Lag Effect of Composite Box Girder with Steel Bottom Plateand Corrugated Steel Web

作　　者：蔡明昊 刘世忠[1] 毛亚娜 CAI Minghao;LIU Shizhong;MAO Yana(School of Civil Engineering,LanzhouJiaotong University,Lanzhou,730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《兰州交通大学学报》2025年第1期106-113,共8页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(51568036,51868040)。

摘　　要：以箱梁弯曲理论为基础,从组合梁截面面内剪切变形入手,从理论上证明了钢底板波形钢腹板组合箱梁纵向翘曲位移函数为二次函数;结合能量变分原理对波形钢腹板组合箱梁剪力滞效应进行了分析,算例试验值及有限元空间模型证明了其可靠性。针对顶板的二维受力特性与悬臂板自由端不受约束的差异,致使理论值与有限元值存在误差的现象,引入修正系数对纵向位移函数进行了优化,结果表明修正系数取1.4时,理论值与有限元值更加吻合;对轴向平衡条件进行了探讨,结果表明:当波形钢腹板组合箱梁宽跨比小于0.5或板宽比小于0.75时,轴向平衡条件应予考虑。Based on the flexural theory for box girders,the deflection function of the composite box girder with steel bottom plate and corrugated steel web plate is proved to be quadratic.The shear lag effect of corrugated steel web composite box girders is investigated through the variational principle of combined energy.The experimental results and finite element model have proved to be more realistic and reliable.Due to the difference between the two dimensional stress characteristics of the roof and the unconstrained free end of the cantilever plate,there is an error between the theoretical value and the finite element value.To simulate realistic experimental conditions,the necessary adjustments was made by introducing correction coefficient.The results shown that the theoretical value is more consistent with the finite element value when the correction coefficient is 1.4.The axial equilibrium conditions were discussed and the results shown thatwhen the width to span ratio of corrugated steel web composite box girder is less than 0.5 or the plate width ratio is less than 0.75,the axial balance condition should be considered.

关 键 词：波形钢腹板 剪力滞效应 翘曲位移函数 能量变分原理 

分 类 号：U488.21[交通运输工程—载运工具运用工程]