考虑轴力转移的并联基础隔震结构地震反应分析
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摘要
在地震作用下,并联基础隔震结构的隔震层随着水平位移的增加,由于两类支座竖向刚度不同,将在两类支座间出现轴力相互转移,隔震层的力与水平位移的关系呈现很强的非线性关系。根据该种隔震结构不同类型支座间轴力在地震过程中相互转移的特点,给出并联基础隔震体系考虑轴力相互转移的隔震层恢复力模型,提出一种基于SIMULINK环境下对并联基础隔震体系考虑支座轴力相互转移进行仿真计算分析的新方法。工程实例计算结果表明,考虑支座承受的竖向荷载变化时,隔震层最大水平位移比不考虑支座竖向承载力变化时有所下降,支座竖向承载力变化所引起的附加摩擦力已经成为一个不能忽视的因素。
Because the vertical stiffness of two kinds of bearings of parallel base isolation structures are different,the axial forces will shift when the displacement of isolation layer increases under earthquake loading;and the dynamic characteristic of isolation layer appears strong nonlinearity.According to the character of axial forces shift between two kinds of bearings under earthquake loading,the resilience model of isolation layer considering the vertical force is given;and the calculating model is studied too.A dynamic simulation method for the isolation system based on SIMULINK is put forward,in which the shift force between the rubber bearing and the sliding isolated bearing is considered.The results of an example show that the horizontal maximum displacement of isolation layer will decrease when the axial force transfer is considered.So the effects of additional friction forces caused by bearing vertical force transfer cannot be neglected.
Because the vertical stiffness of two kinds of bearings of parallel base isolation structures are different,the axial forces will shift when the displacement of isolation layer increases under earthquake loading;and the dynamic characteristic of isolation layer appears strong nonlinearity.According to the character of axial forces shift between two kinds of bearings under earthquake loading,the resilience model of isolation layer considering the vertical force is given;and the calculating model is studied too.A dynamic simulation method for the isolation system based on SIMULINK is put forward,in which the shift force between the rubber bearing and the sliding isolated bearing is considered.The results of an example show that the horizontal maximum displacement of isolation layer will decrease when the axial force transfer is considered.So the effects of additional friction forces caused by bearing vertical force transfer cannot be neglected.
引文
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[10]王沫然.SIMULINK4的建模与动态仿真[M].北京:电子工业出版社,2002.(WANG Moran.Modeling and dynamic simulation of SIMULINK4[M].Beijing:Publishing House of Electronics Industry,2002.(in Chinese))
[11]徐赵东,郭迎庆,周云.被动控制结构的SIMULINK动态仿真分析[J].工程抗震,2001,(4):18–22.(XU Zhaodong,GUO Yingqing,ZHOU Yun,et al.SIMULINK dynamic simulation analysis of passive controlled structure[J].Earthquake Resistant Engineering,2001,(4):18–22.(in Chinese))
[12]中华人民共和国国家标准编写组.GB50011–2001建筑抗震设计规范[S].北京:建筑工业出版社,2001.(The National Standards Compilation Group of People′s Republic of China.GB50011–2001 Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2001.(in Chinese))
[2]周锡元,阎维明,杨润林.建筑结构的隔震、减振和振动控制[J].建筑结构学报,2002,23(2):2–12.(ZHOU Xiyuan,YAN Weiming,YANG Runlin.Seismic base isolation,energy dissipation and vibration control of building structures[J].Journal of Building Structures,2002,23(2):2–12.(in Chinese))
[3]ZHANG W F,LI A Q.Research and practice of base-isolated building structures[C]//LI H N,RU J P ed.Theories and Practices of Structural Engineering.Beijing:Earthquake Press,1998:633–641.
[4]MOKHA A,CONSTANTINOU M,REINHORN A.Teflon bearings in base isolation(I):testing[J].Journal of Structural Engineering,1990,116(2):438–454.
[5]CONSTANTINOU M,MOKHA A,REINHORN A.Teflon bearings in base isolation(II):modeling[J].Journal of Structural Engineering,1990,16(2):455–474.
[6]JANGID R S.Response of pure-friction sliding structures to bi-directional harmonic ground motion[J].Engineering Structures,1997,19(2):97–104.
[7]吕西林,朱玉华,施卫星,等.组合基础隔震房屋模型振动台试验研究[J].土木工程学报,2001,34(2):43–49.(LU Xilin,ZHU Yuhua,SHI Weixing,et al.Shaking table test on building models with combined isolated system[J].China Civil Engineering Journal,2001,34(2):43–49.(in Chinese))
[8]朱玉华,吕西林.组合基础隔震系统地震反应分析[J].土木工程学报,2004,37(4):78–80.(ZHU Yuhua,LU Xilin.Analysis of seismic response of the combined isolated system[J].China Civil Engineering Journal,2004,37(4):78–80.(in Chinese))
[9]张富有.基础隔震的可靠度及串、并联隔震的研究[博士学位论文][D].南京:东南大学,2003.(ZHANG Fuyou.Study on reliability and parallel/series system for base isolation[Ph.D.Thesis][D].Nanjing:Southeast University,2003.(in Chinese))
[10]王沫然.SIMULINK4的建模与动态仿真[M].北京:电子工业出版社,2002.(WANG Moran.Modeling and dynamic simulation of SIMULINK4[M].Beijing:Publishing House of Electronics Industry,2002.(in Chinese))
[11]徐赵东,郭迎庆,周云.被动控制结构的SIMULINK动态仿真分析[J].工程抗震,2001,(4):18–22.(XU Zhaodong,GUO Yingqing,ZHOU Yun,et al.SIMULINK dynamic simulation analysis of passive controlled structure[J].Earthquake Resistant Engineering,2001,(4):18–22.(in Chinese))
[12]中华人民共和国国家标准编写组.GB50011–2001建筑抗震设计规范[S].北京:建筑工业出版社,2001.(The National Standards Compilation Group of People′s Republic of China.GB50011–2001 Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2001.(in Chinese))
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