The strength and displacement performance of the existing brace can be improved by constraining the flexural buckling of the brace covered with steel tuve. However, it is difficult to obtain the specified performance if the space between brace and steel tube should not be controlled appropriately at the time of execution. In this report, the experimental results for investigating the mechanical behavior of the brace constrained flexural buckling by bolt and for establishing the design method are shown. Also, the earthquake resistance reinforcement example with this construction method applied in an existing building is introduced.
