【摘要】 为了研究箱梁剪滞效应,以能量变分法为基础提出一种箱梁剪滞效应分析的样条有限点法.对箱梁底板、顶板及悬臂板分设不同的纵向位移差函数,采用二次抛物线作为箱梁翼缘板纵向位移沿梁宽的分布函数,导出相应广义刚度矩阵和广义荷载列阵.分析了简支梁在均布荷载和跨中集中荷载条件下的剪力滞效应,与相应的试验结果和有限元数值模拟结果对比,验证了该方法的有效性和可靠性.更多还原

【Abstract】 In order to study the shear lag effect of box girder,a spline finite point method for analyzing the shear lag effect of box girder was proposed based on energy variational principle.Three longitudinal displacement differential functions were assumed for the top,bottom and cantilever plates of box girder.With adopting the quadratic parabola as the distribution function of longitudinal displacement along girder width,the generalized stiffness matrix and load vector were deduced.The shear lag effect of a simply supported beam under uniformly distributed load and concentrated load was analyzed.The results calculated by finite element method were compared with the experimental results.The validity and reliability of the proposed method get proved.更多还原