弹塑性缓冲限位与滞变-摩擦并联隔震体系参数分析
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摘要
针对弹塑性缓冲限位与滞变-摩擦并联隔震体系,建立了隔震系统的恢复力模型和隔震体系的运动方程;根据缓冲限位装置的作用机理,定义了隔震层与缓冲限位装置软碰撞和脱离接触过程中的软碰撞拐点和恢复力拐点,给出了拐点时刻的缓冲限位装置位移和恢复力的计算公式,编制了相应隔震体系的非线性分析程序,分析了缓冲限位装置的缓冲限位距离、弹性刚度、屈服位移等关键参数对隔震体系的影响。研究表明:弹塑性缓冲限位距离的合理取值范围为60～100 mm;缓冲限位装置与滞变-摩擦隔震装置的设计参数完全相同,但缓冲限位装置的设置数量为滞变-摩擦隔震装置数量的一半;与仅滞变-摩擦隔震情况相比,并联隔震体系隔震层位移控制效果在30%以上;与无控情况相比,并联隔震体系的上部结构层间位移控制效果在40%以上。
In this research,for the hysteretic-friction system with elastic-plastic displacement-constraint device,the total restoring force model was developed.The motion equation of the isolated system was established.According to the action mechanism of elastic-plastic displacement-constraint device,soft-collision inflection point and restored-force inflection point during the course of colliding and disconnecting between the isolation layer and the displacement-constraint device,were defined.The computational formula of inflection time was given.And the nonlinear analysis program of the corresponding isolated system was worked out.Then,the influence factors such as displacement-constraint distance,elastic stiffness and yield displacement of the displacement-constraint device on the base isolation system were analyzed in detail.The results show that rational distance of the displacement-constraint device is 60-100 mm.The design parameter of the displacement-constraint device is the same as the hysteretic-friction isolation device,but the number is half.Compared with the pure hysteretic-friction isolated system,the isolation effect for the displacement of isolated layer basically is greater than 30%.At the same time,compared with the non-isolated building,the isolation effect of storey-displacement for upper structure is greater than 40%.
In this research,for the hysteretic-friction system with elastic-plastic displacement-constraint device,the total restoring force model was developed.The motion equation of the isolated system was established.According to the action mechanism of elastic-plastic displacement-constraint device,soft-collision inflection point and restored-force inflection point during the course of colliding and disconnecting between the isolation layer and the displacement-constraint device,were defined.The computational formula of inflection time was given.And the nonlinear analysis program of the corresponding isolated system was worked out.Then,the influence factors such as displacement-constraint distance,elastic stiffness and yield displacement of the displacement-constraint device on the base isolation system were analyzed in detail.The results show that rational distance of the displacement-constraint device is 60-100 mm.The design parameter of the displacement-constraint device is the same as the hysteretic-friction isolation device,but the number is half.Compared with the pure hysteretic-friction isolated system,the isolation effect for the displacement of isolated layer basically is greater than 30%.At the same time,compared with the non-isolated building,the isolation effect of storey-displacement for upper structure is greater than 40%.
引文
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[10]Malhotra P K.Dynamics of seismic impacts in baseisolated buildings[J].Earthquake Engineering andStructural Dynamics,1997,26(8):797-813.
[11]Tsai H C.Dynamic analysis of base-isolated shearbeams bumping against stops[J].EarthquakeEngineering and Structural Dynamics,1997,26(5):515-528.
[12]崔艺斌,张富有.带限位钢棒隔震橡胶垫基本特性研究[J].河海大学学报:自然科学版,2007,35(3):302-304.(CUI Yibin,ZHANG Fuyou.Study onfundamental characteristics of rubber insulation bearingwith a steel bar inside[J].Journal of Hohai University:Natural Sciences,2007,35(3):302-304.(inChinese))
[13]赵桂峰.变刚度被动控制体系的研究[D].哈尔滨:哈尔滨工业大学,2001:89-107.(ZHAO Guifeng.Research on variable stiffness positive control system[D].Harbin:Harbin Institute of Technology,2001:89-107.(in Chinese))
[2]Matsagar V A,Jangid R S.Seismic response of base-isolated structures during impact with adjacentstructures[J].Engineering Structures,2003,25(12):1311-1323.
[3]韩淼,周锡元.基础隔震软碰撞保护分析[J].建筑科学,1999,15(1):14-20.(HAN Miao,ZHOU Xiyuan.Analysis of soft-collision safety for base isolatedbuildings[J].Building Science,1999,15(1):14-20.(in Chinese))
[4]周锡元,韩淼,曾德民,等.具有软着陆保护的橡胶支座隔震体系[J].建筑结构学报,2000,21(5):3-11.(ZHOU Xiyuan,HAN Miao,ZENG Demin,et al.Rubber bearing isolation system with soft landingprotection[J].Journal of Building Structures,2000,21(5):3-11.(in Chinese))
[5]韩淼,王秀梅.基础隔震技术的研究现状[J].北京建筑工程学院学报,2004,20(2):11-14.(HAN Miao,WANG Xiumei.The present situation of base isolationtechnology[J].Journal of Beijing Institute of CivilEngineering and Architecture,2004,20(2):11-14.(in Chinese))
[6]杨林,周锡元,苏幼坡,等.基础隔震建筑中应用变刚度保护装置的地震反应分析[J].工业建筑,2006,36(9):24-29.(YANG Lin,ZHOU Xiyuan,SU Youpo,et al.Seismic response analysis of isolated protectiondevice with variable-stiffness for base-isolated buildings[J].Industrial Construction,2006,36(9):24-29.(inChinese))
[7]韩淼,李仙华,杜红凯.钢螺旋弹簧软碰撞限位隔震试验位移反应分析[J].工程抗震与加固改造,2007,29(6):25-28.(HAN Miao,LI Xianhua,DUHongkai.Analysis on displacement response of steelspiral spring soft-collision limiting displacementisolating testing[J].Earthquake Resistant Engineeringand Retrofitting,2007,29(6):25-28.(in Chinese))
[8]樊剑,唐家祥.带限位装置的摩擦隔震结构动力特性及地震反应分析[J].建筑结构学报,2001,22(1):19-24.(FAN Jian,TANG Jiaxiang.Dynamiccharacteristics and earthquake response analysis ofstructures supported on slide-limited friction baseisolation system[J].Journal of Building Structures,2001,22(1):19-24.(in Chinese))
[9]樊剑,刘铁,魏俊杰.近断层地震下摩擦型隔震结构与限位装置碰撞反应及防护研究[J].土木工程学报,2007,40(2):10-16.(FAN Jian,LIU Tie,WEIJunjie.Response and protection of the impact of base-friction-isolated structures and displacement-constraintdevices under near-fault earthquakes[J].China CivilEngineering Journal,2007,40(2):10-16.(inChinese))
[10]Malhotra P K.Dynamics of seismic impacts in baseisolated buildings[J].Earthquake Engineering andStructural Dynamics,1997,26(8):797-813.
[11]Tsai H C.Dynamic analysis of base-isolated shearbeams bumping against stops[J].EarthquakeEngineering and Structural Dynamics,1997,26(5):515-528.
[12]崔艺斌,张富有.带限位钢棒隔震橡胶垫基本特性研究[J].河海大学学报:自然科学版,2007,35(3):302-304.(CUI Yibin,ZHANG Fuyou.Study onfundamental characteristics of rubber insulation bearingwith a steel bar inside[J].Journal of Hohai University:Natural Sciences,2007,35(3):302-304.(inChinese))
[13]赵桂峰.变刚度被动控制体系的研究[D].哈尔滨:哈尔滨工业大学,2001:89-107.(ZHAO Guifeng.Research on variable stiffness positive control system[D].Harbin:Harbin Institute of Technology,2001:89-107.(in Chinese))
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