Abstract:
A shaking table test was conducted on a 10-story 1/8 scaled multiple lateral resisting hybrid structure specimen composed of buckling restrained braces (BRBs), steel frame and shear wall. The dynamic characteristics, acceleration and displacement at each story, and the strains at some critical points of the specimen were tested. The plastic development of the steel frame and the crack evolution and distribution of the concrete shear wall were investigated. Furthermore, the plastic development and energy dissipation of the BRBs at each story were obtained by numerical analysis, and the energy distribution and interaction among the braced frame, steel frame and shear wall were revealed. The crack propagation of the concrete and the plastic distribution of the steel rebar and the encased steel section in the shear wall were examined. The results indicated that: All BRBs and their connections exhibited excellent mechanical performance, and it was found that the BRBs contributed to 89.3% of the total energy dissipation and exhibited excellent damping performance; The energy dissipation of the steel frame contributed to only 0.3% of the total structural energy dissipation, indicating that the steel frame was almost entirely elastic; A lot of horizontal micro-cracks were observed to be relatively uniformly distributed on the surface of the shear wall at floors 1-8, and there was no significant damage observed on the shear wall; both the steel rebar and the encased steel section were primarily elastic. In conclusion, BRBs, steel frame and shear wall worked together effectively under seismic loads, and the entire specimen exhibited excellent seismic performance.