Mechanical Mechanism And Design Method Of Energy-dissipating And Shock-absorbing Components Of Self-resetting Spherical Bearings

In this paper,a new type of spherical bearing damping and energy dissipation component with self-reset function is studied.The component replaces the leaf spring element interlayer in the laminated leaf spring with a low yield point soft steel material,so that it has a good energy consumption capacity in the original cushioning and shock absorption effect.The structure of the component is simple,the force mechanism and energy consumption mechanism are clear.Under the action of small earthquakes,the leaf spring elements always remain in an elastic working state,which provides rigidity and self-reset capability for the components.There is no need for maintenance after the earthquake,and the low yield point mild steel in the components absorbs part of the energy through plastic deformation,which reduces the seismic response of the structure.During a large earthquake,both the leaf spring and the mild steel enter the plastic state,sacrificing the self-reset ability of the component,providing sufficient damping,and giving full play to its energy consumption capacity.This paper further improves the above-mentioned research content through theoretical analysis and numerical simulation,and proposes a parametric design method for components and a seismic design method for grid structures.The main contents are as follows:(1)According to the force state of the component in the working stage,the mechanical mechanism,the mechanism of shock absorption and energy consumption and the principle of self-reset are analyzed theoretically.Select the appropriate mechanical model and make reasonable simplifications and assumptions,and put forward the theoretical calculation method of the important performance indicators of the component.(2)Using ABAQUS finite element analysis software,80 groups of energy dissipation and damping component models were designed,and various dimensional parameters were analyzed comprehensively,and the general law of component performance indicators changing with parameters was obtained.Research shows that the component has good loadbearing capacity and deformation performance.Under the action of low-cycle cyclic load,the mild steel easily enters the yielding energy consumption stage,and various performance indicators can meet the energy consumption and shock absorption requirements of the component.(3)The law of the change of each performance index of energy-consuming and shockabsorbing components with dimensional parameters is clear,and its qualitative relationship can provide guidance for the selection of components.Through theoretical derivation and numerical fitting,this paper gives theoretical calculation formulas of key performance indicators based on the above-mentioned laws,and establishes a component parameterized design method with effective stiffness and equivalent damping ratio as the objective function.(4)Install the component on the support position of the grid structure,and compare the reaction force,node displacement and peak value of the uncontrolled structure and the energy dissipation structure through modal analysis,response spectrum analysis and elastic time history analysis methods Acceleration,the shock absorption and energy consumption performance of the component is obtained.A design method for the damping of the grid frame with the target of damping is proposed,and combined with the parameterized design of the components,the whole process of the design and selection process of the energydissipating damping components of the bearing is formed.