Aseismic performance of metal energy-dissipating damper with self-centering function

Here, to reduce damage and residual deformation of traditional metal damper under strong earthquake, a metal energy-dissipating damper with self-centering function was proposed. The structure form and working mechanism of the self-centering damper were described, and its engineering practical simplified design method was given. The restoring force model of the self-centering damper was established with theoretical analysis. The parametric analysis of the damper was performed using finite element simulation, and the calculation results of the restoring force model were compared with the simulation ones of the FE model. The study showed that the residual deformation after earthquake of the self-centering metal damper can be effectively reduced by using the elastic restoring force of composite disc spring; the hysteretic curve of the self-centering damper is full flag shape, so it has good self-centering performance and energy-dissipating one; the calculated results of the restoring force model agree better with the simulation ones of the FE method, so the established restoring force model can better reflect the hysteretic performance of the self-centering damper under cyclic loading; FE analysis reveals initial gaps among members can weaken the self-centering performance of the damper, so close contact among members should be ensured when installing the damper. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.