Theoretical Analysis and Numerical Simulation on the Hysteretic Behavior of U-shaped Steel Plate Damper with T-shaped Section
The U-shaped steel plate damper has the advantages of good energy dissipation capacity,energy dissipation by its own deformation,stable performance,convenient fabrication,and low price.However,it also has problems such as low initial stiffness and low bearing capacity.Therefore,a U-shaped metal yield damper with T-shaped section(hereinafter referred to as the damper)was proposed in this study.Based on the virtual work principle and Castigliano's Second Theorem,the theoretical formulas of the yield strength and initial stiffness of the damper were established.Based on the nonlinear mixed hardening constitutive model and the three-dimensional ductile fracture criterion,a finite element model of the damper considering material ductile fracture was established.This study focused on the stiffness,strength,energy dissipation capacity and failure mode of the damper.Parametric analysis quantified the influence of geometric dimensions and other parameters on the mechanical properties of the damper.The research shows that the stiffness,strength and energy dissipation capacity of the damper are significantly improved as compared with those of the U-shaped damper.The web width,height,flange width and thickness of the T-shaped section of the damper have significant impact on the mechanical properties of the damper.
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