Performance and application of novel self-centering viscous damper

In order to increase the post-earthquake repairability of frame structures and to reduce the earthquake residual displacement of buildings，the strengthening scheme of adding self-centering viscous dampers（SCVD）was proposed. The mechanical model of SCVD was established. The proposed model was validated through a suite of SCVD mechanical performance tests. The damper force characteristics of SCVD under three initial pressures were analyzed. The seismic resistant simplified calculation method for installation of viscous damper in single-degree-of-freedom frame structures was proposed and validated through history analysis. The results show that，under the same initial pressure，with the increasing of loading frequency，the yielding damping force，peak damping force，energy dissipation and effective damping ratio increased. Under the same loading frequency and displacement amplitude，with the increasing of initial pressure，the yielding damping force，peak damping force and energy dissipation increased. Compared with normal FVD mechanical property，the damping force of SCVD increased，the energy dissipation increased not much. The time history analysis of steel frame structure indicated that among the two damper layout scheme，the damper force of SCVD was bigger than that of fluidic viscous damper（FVD），The frame displacement and residual displacement of FVD scheme were larger than that of SCVD scheme. The time history analysis showed that with the increasing of structure period，the displacement demand increased，the base shear of SCVD frame structure was nearly the same with FVD frame scheme，the displacement demand of FVD scheme was larger than that of SCVD scheme. The SCVD can be used for seismic strengthening of frame structures in high seismic intensity area，which has better aseismic performance compared with those of FVD. © 2023 Editorial Board of Jilin University. All rights reserved.