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Elastic-plastic steel damper(EPSD) is a new device controlling seismic responses.The mechanical principle of EPSD was presented and a comparison was conducted between the theoretical formulas and finite element(FE) simulation of damper units.The verified force-displacement hysteretic curve of the damper system was obtained with reference to tests.The Nanjing Jiangxinzhou Bridge(NJB) was subsequently taken as the case to investigate the seismic response control effect of EPSDs on single-tower self-anchored suspension bridges.A 3-dimensional FE model of the bridge was established in ANSYS and the dynamic and static analyses of the bridge were conducted,the control effect of EPSDs under different seismic waves was further investigated through nonlinear time-history analysis based on the validated model.Results showed that both the simplified theoretical and FE simulation methods can preferable reflect the mechanical performance of EPSD,and that seismic responses of NJB with EPSDs are better than those with elastic connection device or fluid viscous damper.However,the control effect of EPSDs is influenced by seismic wave characteristics.
Elastic-plastic steel damper (EPSD) is a new device controlling seismic responses. The mechanical principle of EPSD was presented and a comparison was conducted between the theoretical formulas and finite element (FE) simulation of damper units. The verified force-displacement hysteretic curve of the damper system was obtained with reference to tests. Nanjing Wanxinzhou Bridge (NJB) was followed take as the case to investigate the seismic response control effect of EPSDs on single-tower self-anchored suspension bridges. A 3-dimensional FE model of the bridge was established in ANSYS and the dynamic and static analyzes of the bridge were conducted, the control effect of EPSDs under different seismic waves was further investigated through nonlinear time-history analysis based on the validated model. Results indicate that both the simplified theoretical and FE simulation methods can be used to reflect the mechanical performance of EPSD, and that seismic responses of NJB with EPSDs are bett er than those with elastic connection device or fluid viscous damper. However, the control effect of EPSDs is influenced by seismic wave characteristics.