Abstract: Based on the matrix displacement method, a simplified method is presented in this paper. This method can be used to calculate the in ternal forcere distribution in plane frame structures due to the removal of a member. In this method,such removal is treated as applying four kinds of load cases to the original structures, and the internaJ force rediStribution can be calculated without modifying the global stiffiness matrix. The computation by this method is time-saving as compared with the traditional method...