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由于抗弯与抗扭性能良好,箱形截面广泛在工民建及桥梁结构中采用。在宽的箱形梁中当腹板间距较大,当对称弯曲时,变形明显地不服从初等梁的理论,这里存在剪力滞效应。本文首先假定翼缘板纵向位移函数按四次抛物线变化规律利用变分法推导出几种边界条件下梁的剪力滞效应,然后按上述位移变化规律,利用差分法解决直线变截面的负剪力滞效应。最后将有机玻璃模型试验结果与理论分析进行对比,得到一些规律与初步结论以便今后继续研究与探索。
Because of its good bending and torsional properties, the box section is widely used in civil construction and bridge structures. In a wide box girder, when the web spacing is large, the deformation obviously obeys the theory of elementary girders when there is symmetrical bending. There is a shear lag effect here. In this paper, we first assume that the longitudinal displacement function of the flange plate changes the parabola according to the quadratic parabola variation law. The shear lag effect of the beam under several boundary conditions is deduced by using the variational method. Then according to the above displacement variation law, Force Lag effect. Finally, comparing the result of plexiglass model test with the theoretical analysis, we can get some rules and preliminary conclusions so as to continue the research and exploration in the future.