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《Sichuan Building Science》 2013-05
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Analysis on factors effect on the buckling stability of rubber bearing

SHEN Chaoyong;MA Yuhong;HUANG Xiangyun;CHEN Yangyang;LIN Jia;ZHOU Minhui;Earthquake Engineering Research & Test Center,Guangzhou University;Guangdong Institute of Architectural Design and Research;  
In this paper,the influence factors of buckling capacity of rubber bearing with lower second shape factor have been analyzed,in which the finite element method(FEM) was employed.A large general finite element software Abaqus was used,the three dimensional finite element model of isolator was established,the Neo-Hookean model was considered for the rubber material,the elastic and elastic-perfectly plastic constitutive model were used for the inner steel material.The influence factors included thickness of the single inner steel,diameter of the internal hole,shear modulus of inner rubber and thickness of rubber cover of isolator.The analysis results included the horizontal critical buckling load and horizontal critical buckling displacement and the vertical deformation of isolator when horizontal displacement occurring.And FEM results of the buckling critical displacement and results of the code formula were compared.The analysis results show that the inner steel plate considering elastic-plastic may be more adverse.Thickness of the inner steel plate increasing and the internal hole diameter of bearing decreasing will cause the horizontal critical buckling load and displacement to increase,but the degree of the latter influence is greater than that of the former.The shear modulus of the inner rubber and thickness of cover rubber effect on the horizontal critical buckling load and displacement are similar,there are a few influence in a certain range,but excess to this range,the influence will be limited,especially for the horizontal critical buckling displacement.The results of the code formula relative to FEM results tend to be conservative,which failed to consider the effect of thickness of the inner steel plate and thickness of rubber cover and needs to be further investigation.
【Fund】: 国家重点基础研究发展计划973项目(2011CB013606) (2012CB723304);; 国家自然科学基金重大研究计划项目(90815027)
【CateGory Index】: TU352.12
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