钢筋砼桁梁桥侧倾稳定性分析的超级单元法

摘要

In this paper, a new type of super element based on the thinwalled bars theory is presented for the lateral stability analysis of the reinforced concrete truss beam bridge with a box section. By the principle of contragradient transformation and the static condensation in structural matrix analysis, the super element stiffness matrices are formed, and a microcomputer program LSAP in FORTRAN language is programmed by the presented method. Because of less degree of freedom in the super element, the less computer interior memory and cost are needed, so the lateral stability of the bridge can be analyzed efficiently by the microcomputer. As a practical application, a designed truss beam bridge is analyzed by the program LSAP, and the result comparison with an analytical method is given in the paper.%针对钢筋砼箱形截面桁梁桥的侧倾稳定性分析，提出一种基于薄壁杆件理论的新型超级单元.通过采用结构矩阵分析中的逆步变换原理和静态凝聚方法，得到了超级单元刚度矩阵，并利用文中提供的算法编制了FORTRAN语言计算程序LSAP.由于超级单元具有较少的自由度，所以本文算法降低了对计算机内存和计算机时的需求，利用微机即可有效地分析工程问题.文中对一桁梁桥设计方案进行了实际计算，并与桁梁桥挠曲扭转理论计算结果进行了对比.