干摩擦板-复位弹簧系统隔震性能研究
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摘要
从理论上分析了干摩擦板-复位弹簧隔震系统的隔震性能,建立了设置隔震系统结构离散多自由度体系运动方程,并计算了一个设置隔震系统结构在地震作用下的动力反应。计算结果表明,应用干摩擦板-复位弹簧隔震系统以后,结构具有较长的自振周期,隔震效果明显,楼层最大位移增加但沿结构高度分布趋于均匀化,最大层间位移值大幅度减少;依靠弹簧能够复位;接触面上的滑移摩擦作用能消耗传入上部结构的地震能量。决定隔震系统效率的关键因素是接触面摩擦系数与复位弹簧的刚度系数;接触面滑移摩擦系数与复位弹簧系数均取较低的数值时,隔震效率可以达到90%左右。
A theoretical analyzing approach about a class of seismic isolation system,dry friction plate-reposition spring system,was presented.It started from the formulation of the governing equation of multiply-degree of freedom system for structures equipped with this seismic isolation system.Computation results demonstrate that it has the three kinds of necessary functions required for an effective seismic isolation system.The relatively long vibration period provides the necessary isolation capability,the spring provides the reposition capability,and the friction forces at the contacting surface provide the seismic energy dissipation capability.It is also shown that the inter-storey drift resulted from seismic action could be drastically decreased on buildings equipped with this system,with the storey drift being enlarged but being distributed more evenly along the height.The friction coefficient and the string constant play significant roles in dictating the seismic isolation effectiveness.A combination of smaller friction coefficient and smaller spring constant could generate a seismic isolation effectiveness of about 90%
A theoretical analyzing approach about a class of seismic isolation system,dry friction plate-reposition spring system,was presented.It started from the formulation of the governing equation of multiply-degree of freedom system for structures equipped with this seismic isolation system.Computation results demonstrate that it has the three kinds of necessary functions required for an effective seismic isolation system.The relatively long vibration period provides the necessary isolation capability,the spring provides the reposition capability,and the friction forces at the contacting surface provide the seismic energy dissipation capability.It is also shown that the inter-storey drift resulted from seismic action could be drastically decreased on buildings equipped with this system,with the storey drift being enlarged but being distributed more evenly along the height.The friction coefficient and the string constant play significant roles in dictating the seismic isolation effectiveness.A combination of smaller friction coefficient and smaller spring constant could generate a seismic isolation effectiveness of about 90%
引文
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[2]周锡元,韩淼,李大望,等.并联合串联隔震体系地震反应的某些特征[J].工程抗震,1995,65(4):1-5.
[3]徐忠根,谢军龙,周福霖.多层建筑隔震改造设计[J].地震工程和工程振动,2001,21(3):132-139.
[4]周锡元,阎维明,杨润林.建筑结构的震动、减振和振动控制[J].建筑结构学报,2002,23(2):2-11.
[5]武田寿一.建筑物隔震防震与控震[M].纪晓惠,译.北京:中国建筑工业出版社,1997.
[6]张玉敏,苏幼坡,梁军,等.碟型弹簧竖向减震装置的研究[J].哈尔滨工业大学学报,2005,37(12):1678-1680.
[7]Wang Yen-Po,Chung Lap-Loi,Liao Wei Hsin.Sesmic Response Analysis of Bridges Isolated with Friction PendulumBearings[J].Earthquake Engineering&Structural Dynamics,1998,27(10):1069-1093.
[8]Jangid R S,Datta T K.Seimic Behaviour of Base Isolated Buildings:A State of the Art Rview[J].Structures and Buildings,1995,110(2):186-202.
[9]李大望,周锡元,王东炜.摩擦摆系统振动性态的进一步分析[J].振动工程学报,2001,14(3):330-333.
[10]Mokha A S,Amin N Constantinou M C,Zayas V.Sesmic Isolation Retrofit of Large Historic Buildings[J].Journal of Struc-tureengineering,ASCE,1996,122(3):298-308.
[11]王兴国,张松,苏幼坡.单层FPS结构隔振结构的平移、扭转耦合性能分析[J].地震工程与工程震动,2006,26(3):205-206.
[12]王刚,魏心磊,赵彤.建筑物隔震技术在日本的研究发展和工程应用[J].世界地震工程,2001,17(4):7-12.
[13]何永超,邓长根,曾康康.日本高层建筑基础隔震技术的开发和应用[J].工业建筑,2002,32(5):29-31.
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