大跨箱梁桥剪力滞剪切变形双重效应分析

Analysis on Double Effect of Shear Lag and Shear Deformation of Large-span Box Girder Bridge

以对直线箱梁考虑剪力滞后、剪切变形的分析为基础,给出考虑双重效应的直线箱梁在均布荷载作用下的初参数解,推导了在局部坐标系下的单元刚度矩阵及等效节点荷载矩阵。利用ANSYS大型有限元软件对大跨度连续梁桥各关键截面进行多工况分析,总结各个工况作用下应力分布情况以及剪力滞系数的分布规律,从而对大跨度连续箱梁桥的整体及典型截面处的应力进行计算、分析。

Based on the analysis of shear lag and shear deformation on straight-line box girder,the original parameter solution of straight-line box girder under uniformly distributed load in consideration of double effect is given,and the element stiffness matrix and the equivalent joint load matrix under local coordinate system are derived.By using the large finite elements software ANSYS,the key sections of long-span continuous girder bridge under the different working conditions are analyzed,and the distribution situation of stress and the distribution law of shear lag coefficient under the different working conditions are summarized so as to calculate and analyze the stress of the whole and typical sections of the long-span continuous box girder bridge.