To reduce the damage and residual deformation of the traditional metal dampers under strong earthquakes, a type of metal energy dissipation damper with self-centering capability is proposed. Firstly, the configuration form and working mechanism of the self-centering damper are introduced. Then an engineering practical simplified method of the damper is proposed. Secondly, restoring force model of the damper is established by theoretical analyses. Finally, finite element simulations are carried out on the self-centering damper to conduct parametric analyses and the finite element simulation results are compared with calculation results of the restoring force model. The research results demonstrate that the residual deformation of the self-centering metal energy dissipation after earthquakes is eliminated by utilizing the elastic restoring force of composite combination disc springs. The damper exhibits full flag-shaped hysteresis curves, confirming that it possesses relatively good self-centering and energy dissipation capabilitiy. The results of finite element simulation are in good agreement with calculation results of restoring force model, validating the established restoring force model can reasonably predict the hysteretic behaviors of the self-centering damper under reversed loading. Finite element analyses also reveal that the initial clearances between members will weaken the self-centering performance of the damper, showing that the members should keep close contact with each other when installed.
Key words
damper /
self-centering /
seismic performance /
earthquake resilience /
disc spring /
finite element
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Footnotes
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