结构杆件撤除后简化分析一般方法

本文提出结构杆件撤除后简化分析的一般方法，视杆件撤除后新结构的解为原结构的解与原结构上加以关联荷载解的叠加，利用原结构的解及总体刚度矩阵的逆矩陈求解新结构，无需进行结构重分析，使计算量大大减小，文中基于有限元法导出求关联荷载的一般算式。该法适用于空间网格结构和刚架结构一根杆件撤除问题，也适用于多根杆件同时撤除问题。

A general simplied analysis method of structure due to the removal of members

A general method of simplied analysis is presented in this paper after the members of structure have been removed. Adding the solution of initial structure to the solution of relative load which acts on initial structure get the solution of new structure. Using the solution of old structure and inverse matrix of initial structure global stiffness matrix to solve new structure, which makes the volume of calculation decreased. The general calculating formula to solve relative load is given based on the finite element method. The method is used to reanalyze internal force and displacement of new structure after a member of grid structure or frame structure has been removed, which is also used to solve the question of more members removed at the same time.