Optimal Mixed Placement and Capacity Distribution of Buckling-Restrained Braces and Conventional Braces on a Large Metal Spatial Structure Without Rigid Diaphragm Assumption

This paper presents a design application of the proposed generalized response spectrum analysis (GRSA)-based seismic optimization method to large metal spatial structure (constructed in Japan) where rigid diaphragm assumption is not available and displacement responses are disproportionally distributed story. It also discusses optimal mixed placement capacity distribution buckling-restrained braces (BRBs) conventional (CBs) minimize both story drift number BRBs (i.e., introduction cost expensive energy-dissipation devices used as dampers). GRSA quick efficient for estimating reduced structural models with degree freedom, GRSA-based computational enables more process than trial-and-error approaches time-consuming nonlinear history analysis. In this study, efficiency verified through comparison Japanese standard BRB method. According results, solution by has approximately 20% less steel tonnage that obtained from method, whereas performance equal or better others. Moreover, although engineers should still consider possibility damage concentration, brace configuration substructure CBs arranged adjacent stories most effective reducing response.