Hysteresis Model Analysis And Application Of Shear Panel Dampers Made Of Low-yield-point Steel

Shear plate damper is one kind of passive energy dissipater and vibration damper.Its application improves the damage to post-earthquake structure caused by traditional anti-seismic design method.LYP has such advantages as low yield point,good ductility,stable hysteretic performance,good fatigue property.Thus,the research progress has made in substituting traditional steel(soft steel)used as the core plate of shear plate damper with LYP,which proves LYP shear plate damper has superior energy dissipation capability.To apply such damper to structure better,theoretical analysis and numerical simulation of LYP shear plate damper were made based on the research achievement of predecessors and better research result had been achieved.The research content of the paper was is below:(1)Theoretical derivation of hysteric model of damper was carried out.Based on the concept of pseudo skeleton curve and Masing criterion,isotropic hardening and kinetic hardening coupling theory was established.On the condition of taking double-linear model and Ramberg-Osgood model as pseudo skeleton and true skeleton curve,four coupled hysteric constitutive analysis models were derived.Then,the parameter of shear plate damper material was substituted into hysteric analysis model and compared with test hysteric curve.The analysis result shows that the coupled hysteric model acquired from theoretical derivation can describe the hysteric performance of shear plat damper better.(2)3D accurate model and 2D equivalent model were established using large general finite element analysis software ABAQUS.Mixed hardening criterion was adopted for the intensification criterion of cyclic constitutive model and material performance parameter was input for finite element value analysis.The difference of these two kinds of modeling methods was compared from hysteric curve,skeleton curve,maximal horizontal bearing capacity and rigidity degeneration.Moreover,it was compared with test curve.Numerical computation result shows that 2D equivalent model can be used for simulating the hysteric performance of LYP shear plate damper.(3)Elastic-plastic seismic response analysis was made between a typical 9-storey steel frame that set up LYP shear plate damper studied in this paper and the 9-storey steel frame that didn’t set up damper.Different quantities and positions of damper installed were considered through simulating hysteric performance of damper using the linkage unit.Moreover,frequent earthquake and rare occurrence of earthquake were considered by adopting three typical seismic waves.Based on these two considerations,the change law of maximal storey drift and maximal base shear were analyzed.The analysis result shows that the damping effect of LYP shear plate damper is excellent.Moreover,the optimal arrangement form of damper in the structure is determined preliminarily in an attempt to apply it to practical engineering structure.The LYP has superior hysteric performance and damping effect,which has been verified from component and structure.It has great prospect in passive energy dissipation and vibration damping field.Thus,it is worth to be further studied and applied.