STUDY ON HYSTERETIC MODEL AND SEISMIC PERFORMANCE OF DAMPING ENERGY DISSPATION BRACE WITH SELF-CENTERING CAPABILITY

On the basis of a traditional magnetorheological (MR) damper, a novel damping energy dissipation brace with self-centering capability is developed. A restoring force calculation model, the improved double Bouc-Wen model, is established to portray the hysteretic behaviors of the damping energy dissipation brace by improving the traditional Bouc-Wen model, which is simulated in Simulink environment, and the simulation results are compared with the finite element analysis results. The secondary development program of the improved double Bouc-Wen model is carried out based on OpenSees platform, and using a 9-story benchmark steel frame structure as a numerical example, the comparisons of the seismic performances between a structure with the damping energy dissipation braces and a structure with buckling restrained braces (BRBs) are conducted. The hysteretic curves obtained from the double Bouc-Wen model agree well with those obtained from the finite element simulation, and the flag-shaped hysteretic behaviors of the brace can be accurately portrayed by the proposed improved double Bouc-Wen model. The maximum interstory drift and residual deformation of a steel frame structure after earthquakes are effectively reduced, so that the structure with damping energy dissipation brace exhibits a good recovery performance.