水平双向压剪状态下铅芯叠层橡胶支座力学性能研究
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摘要
建立了铅芯叠层橡胶支座的有限元模型,对支座在水平单向和双向压剪状态下的力学性能进行了研究,表明铅芯叠层橡胶支座在水平双向压剪状态下,由于水平双向受力的耦合效应,支座的耗能性能、屈服后刚度和水平等效刚度均有一定程度的降低,而支座的屈服力和等效阻尼比变化较小;水平双向压剪状态下,支座的最大水平剪应力明显增大,并且随着支座剪切变形的增大,其剪应力的增大幅度加大,使支座易由于承载力不足而发生破坏。因而,在设计时应考虑水平双向受力的耦合效应对铅芯叠层橡胶支座力学性能的影响。
A finite element model of the lead rubber bearing was established. The mechanical properties of the bearings in unidirectional and bidirectional compression-shear state were analyzed. The results show that in bidirectional compression-shear state,due to the coupling effects of the bidirectional force,the energy performance,the post-yield stiffness and the equivalent stiffness of the bearing reduced,the yield force and the equivalent damping ratio of the bearing have little change. In bidirectional compression-shear state,the maximum shear stress of the bearing obviously increases,and with the bearing shear deformation increase the shear stress of the bearing significantly increases,so that the bearing can be damaged due to its insufficient capacity. Therefore,the coupling effects of the bidirectional force on the mechanical properties of the lead rubber bearing should be considered.
A finite element model of the lead rubber bearing was established. The mechanical properties of the bearings in unidirectional and bidirectional compression-shear state were analyzed. The results show that in bidirectional compression-shear state,due to the coupling effects of the bidirectional force,the energy performance,the post-yield stiffness and the equivalent stiffness of the bearing reduced,the yield force and the equivalent damping ratio of the bearing have little change. In bidirectional compression-shear state,the maximum shear stress of the bearing obviously increases,and with the bearing shear deformation increase the shear stress of the bearing significantly increases,so that the bearing can be damaged due to its insufficient capacity. Therefore,the coupling effects of the bidirectional force on the mechanical properties of the lead rubber bearing should be considered.
引文
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[13]江宜城,聂肃非,叶志雄,等.多铅芯橡胶隔震支座非线性力学性能试验研究及其显式有限元分析[J].工程力学,2008,25(7):11-17.JING Yicheng,NIE Xiaofei,YE Zhixiong,et al.Experimental study on mechanical properties of multi-lead rubber bearing and its explicit finite element anslysis[J].Engineering Mechanics,2008,25(7):11-17.(in Chinese)
[14]GB/T 20688.1-2007橡胶支座:第1部分:隔震橡胶支座试验方法[S].GB/T 20688.1-2007 Rubber bearings—Part 1:Seismic-protection Isolators Test Methods[S].(in Chinese)
[2]陆伟东,刘伟庆,吴晓飞,等.昆明新国际机场航站楼A区结构模型振动台试验研究[J].建筑结构学报,2011,32(6):27-33.LU Weidong,LIU Weiqing,WU Xiaofei,et al.Shake table test of terminal a structure of Kunming international airport[J].Journal of Building Structures,2011,32(6):27-33.(in Chinese)
[3]胥玉祥,朱玉华,卢文胜.云南省博物馆新馆隔震结构模拟地震振动台试验研究[J].建筑结构学报,2011,32(10):39-47.XU Yuxiang,ZHU Yuhua,LU Wensheng.Shaking table model test of New Yunnan Provincial Museum[J].Journal of Building Structures,2011,32(10):39-47.(in Chinese)
[4]韩强,杜修力,刘晶波,等.多维地震作用下隔震桥梁地震反应(I)—模型结构振动台试验[J].振动与冲击,2008,27(9):59-65.HAN Qiang,DU Xiuli,LIU Jingbo,et al.Seismic response of isolated bridges with LRB under multi-directional earthquake—part(Ⅰ)shake table test of bridge model[J].Journal of Vibration and Shock,2008,27(9):59-65.(in Chinese)
[5]朱腾宇,朱玉华.铅芯橡胶支座滞回特性的振动台试验研究[J].结构工程师,2012,28(4):128-132.ZHU Tengyu,ZHU Yuhua.Shake table test on hysterical properties of lead rubber bearings[J].Structural Engineers,2012,28(4):128-132.(in Chinese)
[6]王建强,管品武,姚谦峰.铅芯叠层橡胶支座基础隔震结构双向地震反应分析[J].地震工程与工程振动,2005,25(1):133-137.WANG Jianqiang,GUAN Pinwu,YAO Qianfeng.Analysis on bilateral seismic response of base-isolated structure with lead rubber bearings[J].Earthquake Engineering and Engineering Vibration,2005,25(1):133-137.(in Chinese)
[7]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007,28(3):38-43.ZHONG Tieyi,YANG Fengli,WU Bin.Analysis of the bidirectional seismic responses for seismically isolated railway simple supported beam bridge by lead rubber bearing[J].China Railway Science,2007,28(3):38-43.(in Chinese)
[8]杜修力,韩强,刘晶波.多维地震作用下隔震桥梁地震反应—理论分析与试验结果比较[J].振动与冲击,2008,27(9):66-71.DU Xiuli,HAN Qiang,LIU Jingbo.Seismic response of isolated bridges with LRB under multi-directional earthquake—part(Ⅱ)theoretical and comparative analysis[J].Journal of Vibration and Shock,2008,27(9):66-71.(in Chinese)
[9]Abe M.Yoshida J.,and Fujino Y.Multiaxial behaviors of laminated rubber bearings and their modeling.I:experimental study[J].Journal of Structure Engineering,2004,130(8):1119-1132.
[10]李祯,李向真,向伟明,等.铅芯橡胶隔震支座水平双向试验研究[J].广州大学学报(自然科学版),2011,10(3):62-66.LI Zhen,LI Xiangzhen,XIANG Weiming,et al.Research on lead rubber bearing in horizontal two-dimensional loading test[J].Journal of Guangzhou University(Natural Science Edition),2011,10(3):62-66.(in Chinese)
[11]王翔.铅芯叠层橡胶支座多向受力力学性能研究[D].郑州:郑州大学,2013.WANG Xiang.The mechanical properties of lead rubber bearing under multiaxial loading[D].Zhengzhou:Zhengzhou University,2013.(in Chinese)
[12]郑明军,王文静,陈政南,等.橡胶Mooney-Rivlin模型力学性能常数的确定[J].橡胶工业,2003,50(8):462-465.ZHENG Mingjun,WANG Wenjing,CHEN Zhengnan,et al.Determination for mechanical constants of rubber Mooney-Rivlin model[J].China Rubber Industry,2003,50(8):462-465.(in Chinese)
[13]江宜城,聂肃非,叶志雄,等.多铅芯橡胶隔震支座非线性力学性能试验研究及其显式有限元分析[J].工程力学,2008,25(7):11-17.JING Yicheng,NIE Xiaofei,YE Zhixiong,et al.Experimental study on mechanical properties of multi-lead rubber bearing and its explicit finite element anslysis[J].Engineering Mechanics,2008,25(7):11-17.(in Chinese)
[14]GB/T 20688.1-2007橡胶支座:第1部分:隔震橡胶支座试验方法[S].GB/T 20688.1-2007 Rubber bearings—Part 1:Seismic-protection Isolators Test Methods[S].(in Chinese)
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