Abstract
In this study, double-stage yield buckling-restrained steel bar dampers (DY-BRBDs) were applied at the beam-column joint, where the DY-BRBDs mainly consist of buckling-restrained steel bar dampers (BRBDs) and BRBDs with gaps (Gap-BRBDs) in parallel. First, a theoretical analysis of the mechanical properties of DY-BRBDs was performed. Cyclic loading tests were then conducted on the beam–column joints with the DY-BRBDs. The test results indicated that the DY-BRBDs exhibited stable hysteresis performance and double-stage yield characteristics. Numerical analysis models were created to simulate the hysteretic behavior of the connection. The theoretical values and simulation results were compared with the test results to verify the accuracy of the theoretical analysis and numerical model. Finally, pushover and seismic analyses were conducted on a 10-story steel frame structure equipped with DY-BRBDs, and the seismic performance of the frames with DY-BRBDs was compared with that of a frame with single-stage yield buckling-restrained steel bar dampers. The analysis results indicated that the DY-BRBDs could effectively reduce the story drift and residual drift of the structure and improve the deformation uniformity of the steel frame along the height.
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