Adaptive Passive-Control for Multi-Stage Seismic Response of High-Rise Braced Frame Using the Frictional-Yielding Compounded BRBs

Buckling-restrained brace (BRB) is a dual-function device that improves the seismic resistance and energy-dissipation capacity of structures in earthquake engineering. To achieve expected performance under severe ground motions, BRB usually designed to remain elastic mild earthquakes, leading increased forces insignificant vibration-reduction effect on at this stage. This study extends concept adaptive passive-control by proposing novel frictional-yielding compounded (FBRB). FBRB fabricated connecting steel casing end plates with friction dampers (FDs) such way core FDs undergo compatible deformation. In way, FD dissipates energy while together resulting an efficient self-adaptive mechanism. The proposed construction was experimentally validated carrying out reversed-cyclic test, result indicated reliable connection stable hysteretic behavior. Subsequently, FBRB-equipped frame studied which adopted as energy-dissipative devices. A parametric design method developed determine parameters maximum drift system could be reduced code-allowable value. approach implemented 48-story mega case study. behavior structure compared BRB-equipped system, critically evaluated nonlinear time-history analyses. Results revealed compensated for conventional terms inadequate dissipation earthquakes and, meanwhile, more than reducing lateral drifts motions. analysis potential application prospect practical