结构一般布局修改的静力重分析方法

his paper presents a static reanalysis method for general layout modifications. The method is based on the preconditioned conjugate gradient technique. A preconditioned conjugate gradient approach is developed. The preconditioner is constructed, and an efficient implementation for applying the preconditioner is presented. The implementation involves only decomposition of the stiffness matrix corresponding to the newly added degrees of freedom. In particular, the approach can adaptively monitor the accuracy of approximate solutions. Numerical examples show that the condition number of the selected preconditioned matrix is largely reduced. Therefore the fast convergence and accurate results can be achieved by the approach.