变截面箱形梁畸变分析的刚度法

Stiffness Analysis for Distortion of Box Gireder with Various Cross Sections

利用箱形梁的畸变微分方程和弹性地基梁挠曲微分方程之间的比拟关系 ,推导出变截面箱形梁畸变分析的单元刚度矩阵 ,该单元刚度矩阵与一般杆系结构的单元刚度矩阵完全相似 ,使得箱形梁桥畸变分析可按一般杆系结构的刚度法进行 .

Based on the similitude between the differential equation for distortion of box section girder and the differential equation for beam on elastic foundation, We develop in this paper the stiffness matrix for distortion of box girder with various cross sections. This stiffness matrix has the complete similitude with the ordinary stiffness matrix for beam element. So the proposed method is applied to the stiffness analysis for distortion of box girder as the conventional structural member systems. This method has the advantages of clear mechanics concept, brief developing process, simple program and accurate result.