Research On Mechanical Performance And Buckling Resistance Design Of Thick Laminated Rubber Bearing

The existing ordinary laminated rubber isolation bearing has good vertical stability and horizontal isolation performance.It is widely used in the field of isolation engineering.In order to solve vertical vibration isolation function,the thick laminated rubber bearing can be considered to achieve low vertical stiffness requirements of bearing.However,the buckling stability of the thick laminated structure is easy to appear,and because of the influence of the thick laminated characteristics,the mechanical properties and design of the support can not directly follow the standard and method of the traditional laminated rubber isolation bearing,which has become the bottleneck restricting the development of its technology.Aiming at these problems,combined with practical engineering,this paper puts forward the design of thick laminated rubber bearing to solve its stability problem,and research on its mechanical properties.The main research work and innovation points are as follows:1.Put forward the layer parallel design of thick laminated rubber bearings,and put forward the design of the buckling restrained device for rubber bearings to avoid friction and hard contact.According to the engineering design requirements and small space constraints,the theoretical analysis and experimental verification of thick rubber laminated bearings with layer parallel connection are carried out.The buckling stability of thick laminated rubber bearings under low stiffness and high bearing capacity is greatly improved.2.Based on the Mooney-Rivlin rubber constitutive model,a fine finite element analysis model for thick laminated rubber bearings is established.The mechanical properties of the layer parallel thick laminated rubber bearing and the other kinds of thick laminated rubber bearing are studied by the optimization of the thick laminated rubber bearing based on the fine finite element simulation combined with the product process.The reliability and error of the numerical model are analyzed through the sample test.3.Based on the comprehensive comparison of the theoretical design,the finite element analysis and the sample test,the error causes of the theoretical formula and the numerical model test conditions are studied,and the mechanical properties of the thick laminated rubber bearing are analyzed.The vertical stiffness design formula of the thick laminated rubber bearing is proposed to consider the error correction suggestion of the stiffness hardening behavior.4.Based on the polynomial hysteretic model,the macroscopic constitutive description of thick laminated rubber bearing considering strong nonlinear hysteretic behavior is given.According to the hysteresis characteristics of several thick laminated rubber bearings in horizontal and vertical directions,the polynomial model is used to fit the description and the model parameters are identified though the experimental analysis,and the macroscopic constitutive models for the vertical and horizontal nonlinear hysteretic behavior of the bearing are studied.