An Experimental Analysis On The Seismic Isolation Property Of Cylindrical Metal-rubber Isolator

In current base isolation technologies，laminated rubber damping bearing is most widelyapplied. Based on the durability problems which existed in the using of traditional laminatedrubber isolation bearings， In my research we introduced metal-rubber material which made ofstainless steel wire，designed and produced a new isolation bearing. Then we have studied itsproperty of shearing and actual isolation performance. My thesis include some parts as follow.Firstly, we collected all data and information about metal-rubber which included currentresearch status and preparation technologies. Then we chose a appropriate factory and confirmedthe production process and form of isolation bearing by discussing with the technologists.Finally we designed and made three isolation bearings with different depth-width ratio afterfeasibility analysis.Secondly, under different frequency and loading amplitude we compared and studied theshearing property of the three isolation bearings with different depth-width ratio.In addition wealso studied the axial bearing capacity and the metal rubber’s shearing performace under theaxial load of the three bearings.Thirdly, we tested the actual effect of vibration isolation of the isolation bearings by steelframe model’s isolation experiment. After that, we continued to study the isolation performanceof the bearings under different depth-width ratio, seismic strength and axial load.At last, we analyzed and concluded the influence factors of metal rubber on shearing andisolation performance.The findings and conclusions in my research is summarized as follow：1. Loading frequency’s effect on the shearing direction lag performance of metal rubbermaterial is so small and decrease with the increase of load amplitude.2. With the increase of load amplitude, the total energy which shear direction consumed alsocontinue to increase, and horizontal shear stiffness of metal rubber is essentially unchanged, andthe equivalent damping ratio decreases. At the same time under the lower vibration intensity, It isnot good for the structure of metal wires inside the metal rubber to overcome the sheardeformation generated by the dislocation made by relative friction, which affect the actual vibration isolation effect of isolation bearing.3. Depth-width ratio’s influence on the performance of metal rubber bearing is obvious. Tobe specific, with decreasing of depth-width ratio, the capacity of consuming energy enhances,meanwhile the equivalent stiffness and equivalent damping also increase.But the decrease of thedepth-width ratio of isolation bearing makes shear stiffness increased, which lead to that theactual performance of isolation energy consumption of isolation bearings is not obvious.Although the increasing of depth-width ratio can make shearing deformation ability enhanced,the stability of bearing reduces.4. The axial stiffness of metal rubber isolation bearing made of stainless steel wire is farhigher than shear stiffness. Under the axial loading condition, metal rubber’s capability of levelenergy consumption will be greatly enhanced. But applying axial load will make the metal wiresinside of the metal rubber bite more closely. Meanwhile damping performance enhancementmakes relative dislocation is not easy to happen, which also makes the actual vibration isolationperformance of isolation bearing is greatly reduced.