This study considers structural reanalysis owing to the modification of structural elements including (1) addition of substructures,\n(2) removal of substructures, and (3) changes in design variables. Coupling and decoupling reanalysis methods proposed in the\nstudy are performed by using the concept of compatibility conditions at interface nodes between the substructures or between the\noriginal structure and the substructures. Subsequently, a generalized inverse method to describe constrained responses is modified\nto obtain the reanalysis responses. In this study, constrained equilibrium equations are modified to consider a reanalysis of\na structure with the addition and removal of statically stable or unstable substructures. The proposed reanalysis method is\nexamined by using five examples of handling coupling and decoupling reanalysis of a truss structure.
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