超低硬度橡胶隔震支座力学性能的有限元分析
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摘要
对G值约为0.196 MPa、直径600 mm的超低硬度天然橡胶隔震支座(LNR)和铅芯橡胶隔震支座(LRB)在竖向压应力作用下进行了有限元(FEA)初步数字模拟研究。建立了支座的精细有限元模型,并对其基本力学性能的有限元计算结果与理论计算结果、试验结果进行了对比,吻合较好,侧面验证了计算模型的正确性。通过对LNR和LRB在竖向压力下的有限元数值分析模拟,研究了天然橡胶隔震支座内部钢板应力特征、内部橡胶应变特征、铅芯橡胶隔震支座中铅芯应力特征、铅芯与内部钢板及内部橡胶的相互作用机理。LNR支座FEA初步分析表明,因硬度超低,靠近孔壁处内部橡胶在竖向压应力下较早表现出较大非线性,内部钢板在孔壁处较早出现一定程度的应力集中。LRB支座FEA分析中表明,铅芯与内部橡胶、内部钢板相互作用明显。
For LRB and LNR with shear modulus about 0. 196 MPa,diameter 600 mm,preliminary FEA on them loaded with compression were carried out. An accurate finite model was established,the discrepancy among the theory results,the test results and the FEA results was very little,it testified the accuracy of the FEA model. The FEA models of LNR and LRB loaded by the vertical pressure were performed,the research concern including stress of inner steel and strain of inner rubber in LNR,stress of lead-core and interaction between lead-core and inner steel,inner rubber in LRB. It is concluded that non-linear feature will early appear in the inner rubbers near core during FEA,stress concentration appears in the inner steels near core because of lower hardness of rubber. Apparent interaction between lead- core and inner steel,inner rubber will also be found in FEA on LRB.
For LRB and LNR with shear modulus about 0. 196 MPa,diameter 600 mm,preliminary FEA on them loaded with compression were carried out. An accurate finite model was established,the discrepancy among the theory results,the test results and the FEA results was very little,it testified the accuracy of the FEA model. The FEA models of LNR and LRB loaded by the vertical pressure were performed,the research concern including stress of inner steel and strain of inner rubber in LNR,stress of lead-core and interaction between lead-core and inner steel,inner rubber in LRB. It is concluded that non-linear feature will early appear in the inner rubbers near core during FEA,stress concentration appears in the inner steels near core because of lower hardness of rubber. Apparent interaction between lead- core and inner steel,inner rubber will also be found in FEA on LRB.
引文
[1]周福霖.工程结构减震控制[M].北京:地震出版社,1997.
[2]刘文光,杨巧荣,周福霖.建筑用铅芯橡胶隔震支座温度性能研究[J].世界地震工程,2003,19(2):39-44.
[3]何文福,刘文光,杨彦飞,等.橡胶支座水平剪切弹塑性能力学试验研究[J].兰州理工大学学报,2007,33(3):120-123.
[4]韩强,杜修力,刘文光,等.橡胶隔震支座拉伸性能试验研究[J].北京工业大学学报,2006,32(3):208-212.
[5]刘文光,杨巧荣,周福霖.天然橡胶隔震支座温度相关性试验研究[J].广州大学学报:自然科学版,2002,1(6):51-56.
[6]杨巧荣,庄学真,刘文光,等.夹层橡胶隔震支座全刚性性能、回转性能及高压缩应力性能试验研究[J].地震工程与工程振动,2000,20(4):118-125.
[7]GB/T 20688.1 2007橡胶支座:第1部分:橡胶隔震支座试验方法[S].
[8]MINEO T,HIDEYUKI T,RYUICHI T.Finite-element analysis of laminated rubber bearing used in base-isolation system[J].Rubber Chemistry and Technology,1992,1(65):46-62.
[9]GB 20688.3 2006橡胶支座:第3部分:建筑橡胶隔震支座[S].
[2]刘文光,杨巧荣,周福霖.建筑用铅芯橡胶隔震支座温度性能研究[J].世界地震工程,2003,19(2):39-44.
[3]何文福,刘文光,杨彦飞,等.橡胶支座水平剪切弹塑性能力学试验研究[J].兰州理工大学学报,2007,33(3):120-123.
[4]韩强,杜修力,刘文光,等.橡胶隔震支座拉伸性能试验研究[J].北京工业大学学报,2006,32(3):208-212.
[5]刘文光,杨巧荣,周福霖.天然橡胶隔震支座温度相关性试验研究[J].广州大学学报:自然科学版,2002,1(6):51-56.
[6]杨巧荣,庄学真,刘文光,等.夹层橡胶隔震支座全刚性性能、回转性能及高压缩应力性能试验研究[J].地震工程与工程振动,2000,20(4):118-125.
[7]GB/T 20688.1 2007橡胶支座:第1部分:橡胶隔震支座试验方法[S].
[8]MINEO T,HIDEYUKI T,RYUICHI T.Finite-element analysis of laminated rubber bearing used in base-isolation system[J].Rubber Chemistry and Technology,1992,1(65):46-62.
[9]GB 20688.3 2006橡胶支座:第3部分:建筑橡胶隔震支座[S].
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