【摘要】 建立了箱梁在压弯荷载共同作用下考虑劳力滞的控制微分方程，取控制微分方程的齐次解作为梁段的有限元位移模式．在变分原理的基础上，分别导出了在仅有轴向荷载及压弯荷载共同作用下的关于剪滞效应的梁段单元刚度矩阵和荷载列阵．提出了一种适用于斜拉桥或预应力混凝土变截面箱形梁桥等剪力滞计算的梁段有限元法．本文的计算结果与有机玻璃模型试验的结果，以及有限条法的分析值均符合良好．更多还原

【Abstract】 This paper established the governing differential equation of the shear lag in box girders under bending and axial loading. The homogeneous solution of the differential equation for the shear lug was taken as the displacement pattern of finite segment. Based on the variational principle. the element stiffness inatrices and loading column matrices for shear lag effects were derived respectively under the sole axial loading and under silmultaneous bending and axial loading. A finite segment method for tile shear lag was presented alld could be apPlied to the cable-stayed bridges and box girders with varying depths. The results calculated by this method were in good agreement with experimentnl results and those from numericalanalysis by tile strip method.更多还原