Study On Mechanical Properties Of Damping And Isolation Friction Pendulum Bearing Under Different Parameters

Friction pendulum bearing is a kind of damping and isolation bearing,which has good isolation and shock absorption performance.Since the 1970 s,plate rubber bearing,ball steel bearing and friction pendulum bearing have been studied systematically in China,and have been applied in engineering practice.In this thesis,the theoretical analysis of the single spherical friction pendulum bearing and the double concave friction pendulum bearing is carried out,and the finite element software ABAQUS is used for simulation analysis and comparison.By designing orthogonal tests of different factors,the effects of various parameters on the hysteretic energy dissipation,residual displacement,equivalent stiffness,equivalent damping ratio and equivalent friction coefficient of the bearing are analyzed and compared.Using the results obtained by finite element ABAQUS simulation as dependent variables,the range difference and significance comparison obtained by orthogonal experiment were calculated to illustrate the main effects of various support parameters.The maximum slip displacement of the friction pendulum bearing with double concave surface is slightly less than the actual design slip displacement.The main influencing factors are analyzed and the corresponding calculation formulas are given.In this thesis,quasi-static test simulation analysis is established by ABAQUS finite element software for friction pendulum bearing simulation.The experimental supports were subjected to low periodic repeated loads,the seismic effect was simulated,and supports with different parameters were established based on theoretical analysis.The influences of major design parameters,such as vertical load,sliding displacement,sliding surface radius and friction coefficient,on the support performance were compared.The main contents of this paper are as follows:(1)This thesis first analyzes the theoretical results of the basic design parameters of the bearing through the simple mechanical diagram of the single spherical friction pendulum bearing.Then the theoretical results of the basic design parameters of the double concave friction pendulum bearing are analyzed.(2)Based on the test results of single spherical friction pendulum bearing and double concave friction pendulum bearing as well as the size of the test support in the references.Through ABAQUS finite element software,the experiment process was simulated and the simulation results were compared to verify the correctness of the theoretical analysis and the feasibility of the simulation method.(3)Based on the orthogonal test table,the experimental design is carried out for each influencing factor of friction pendulum bearing.Combined with the basic design parameters of the friction pendulum bearing,different friction coefficient,slip displacement,vertical load and isolation period of the bearing are designed.The main influence effect of each type of bearing is analyzed and compared,and the optimal combination is given.(4)Combined with the theoretical analysis results of friction pendulum bearing.The equivalent friction coefficient,equivalent stiffness and actual maximum slip displacement of the bearing are verified by designing three groups of double-concave friction pendulum bearing with different parameters.