Numerical Simulation And Experimental Research Of Self-Centering Steel Spherical Bearing

The shock-absorbing bearing with self-reset capability and energy consumption function has broad development prospects and great engineering application value.Based on the universal shock-absorbing spherical steel bearing,this paper designed the energy consumption of its spring damping element,and proposed a new type of shock-absorbing energy-consuming spherical steel bearing.The core elements of this new type of support are spring steel plates and metal energy-consuming steel plates which are stacked together.Under the action of earthquake,the spring steel plate maintains elasticity and provides self-reset capability,and the energy-consuming steel plate dissipates energy through elastic-plastic deformation.In this paper,the hysteretic performance of the shockabsorbing energy dissipation component of this new type of support is analyzed by a combination of experimental research and finite element analysis.The research results provide a reliable basis for the theoretical improvement and design optimization of this new type of shock-absorbing and energy-consuming components.The main contents of this article are summarized as follows:(1)This article explains the structure and working principle of the shock-absorbing and energy-dissipating member of the support in detail.The quasi-static test and hysteretic performance analysis were carried out on the shock-absorbing and energydissipating components of the two structures.The results show that this kind of component has energy dissipation capability,which verifies the correctness of the component design theory.(2)The mechanical properties of the energy-dissipating steel plates in the shockabsorbing and energy-dissipating members were tested,and the mechanical properties of Q295 steel under cyclic loading were analyzed.The material parameters of Q295 steel were calibrated using the bilinear kinematic hardening constitutive model and the mixed hardening model.The finite element simulation of the Q295 steel specimen was established using these two models and compared with the mechanical performance test results.The comparison results show that the mixed hardening model can accurately simulate the mechanical characteristics of Q295 steel plate under cyclic loading,which provides a basis for the finite element modeling of the seismic energy dissipation component of the support.(3)Finite element models were established for the two sets of support shock-absorbing energy dissipation components,and the simulation results were consistent with the test results.The finite element analysis results show that the energy-consuming steel plate is easy to enter the plastic energy-consuming state under the unidirectional cyclic load.The spring steel plate can maintain the elastic state even when it is loaded to the maximum displacement,and the whole component is evenly stressed and the working performance is stable.(4)The orthogonal experiment method was used to analyze the influence of parameters on the shock-absorbing energy dissipation members.25 groups of finite element models were established for the two-layer spring steel plate with one layer of energy-absorbing steel shock-absorbing and energy-dissipating members,and the effects of energy-consuming steel plate material,energy-consuming steel plate thickness,spring steel plate thickness,steel plate width and arc starting height were analyzed.(5)Three grid models are built to check the seismic performance of this new bearing by using SAP2000.The results of response spectrum analysis and the dynamic timehistory analysis of the 8-degree frequent earthquakes show that the bearing can effectively reduce the seismic response of the structure.