大型滑移基础隔震储罐地震反应影响因素研究
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摘要
采用Bouc-Wen微分连续性模型模拟滑移支座的力学性能,对大型滑移基础隔震储罐非线性地震反应进行了仿真分析,得到了不同类型场地上大型滑移隔震储罐的地震响应特点,总结出了支座摩擦系数、复位刚度以及地震强度等因素对地震反应的影响规律。研究结果表明:大型滑移隔震储罐不适合建立在I类场地上,而在II类场地上减震效果最好。在IV类场地上隔震储罐出现晃动波高放大现象,并且需要增大支座摩擦系数和设置复位装置来控制过大位移反应。增大滑移支座复位刚度可以显著降低支座的残留位移。大型滑移隔震储罐在高地震强度地区的减震效果更好。
The Bouc-Wen model was adopted to simulate the non-linear hysteretic characteristics of force-displacement relationship for sliding bearing.The nonlinear equations of motion of large scale sliding base-isolated tank was solved by the Newmark's step-by-step method and Runge-kutta method.The seismic response characteristics of large scale sliding based-isolated storage tank at different sites were investigated.The influence of friction coefficient,restoring stiffness and earthquake intensity on the response of base-isolated tank was analyzed.The results indicate that large scale sliding base-isolated storage tank is unsuitable to be built at Site I and it has great isolation effect at Site II.The amplitude of sloshing height of liguid in the tank can increase remarkably at Site IV,moreover larger bearing displacement should be reduced by increasing friction coefficient and restoring stiffness of sliding bearing.The increase of restoring stiffness of sliding bearing can suppress sliding resident displacement effectively.The stronger the intensity of ground motion is,the better isolation effect the large scale sliding base-isolated tank has.
The Bouc-Wen model was adopted to simulate the non-linear hysteretic characteristics of force-displacement relationship for sliding bearing.The nonlinear equations of motion of large scale sliding base-isolated tank was solved by the Newmark's step-by-step method and Runge-kutta method.The seismic response characteristics of large scale sliding based-isolated storage tank at different sites were investigated.The influence of friction coefficient,restoring stiffness and earthquake intensity on the response of base-isolated tank was analyzed.The results indicate that large scale sliding base-isolated storage tank is unsuitable to be built at Site I and it has great isolation effect at Site II.The amplitude of sloshing height of liguid in the tank can increase remarkably at Site IV,moreover larger bearing displacement should be reduced by increasing friction coefficient and restoring stiffness of sliding bearing.The increase of restoring stiffness of sliding bearing can suppress sliding resident displacement effectively.The stronger the intensity of ground motion is,the better isolation effect the large scale sliding base-isolated tank has.
引文
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[11]李扬,李自力,张艳铅芯橡胶支座隔震储罐地震响应特性分析[J].工程抗震与加固改造,2009,37(5):39-45.Li Yang,Li Zili,Zhang Yan.Response Characteristic of Liquid Storage Tank Isolated by Lead Rubber Bearings[J].Earthquake Resistant Engi-neering and Retrofitting.2009,37(5):39-45.
[12]李自力,李扬,李洪波.大型LRB隔震储罐地震反应参数研究[J].四川大学学报(工程科学版).2010,42(5):134-141.LI Zili,LI Yang,LI Hongbo.Parametric Research on Seismic Response of Large Scale Liquid Storage Tank Isolated by Lead-rubber Bearings[J].Journal of Sichuan University(Engineering Science Edition).2010,42(5):134-141.
[13]Kelly J M Aseismic base isolation:Reviewand bibliography[J].Soil dynamics and Earthquake Engineering.1986,5:202-216.
[14]Spencer B.F,Nagarajajah S.State of the art of structural control[J].Journal of Structural Engineering,ASCE.2003,129(7):845-856.
[2]Zayas V A,Low S S.Application of seismic isolation to industrial[J].Pressure Vessels and piping.1995.
[3]Malhotra P K.Method for seismic base isolation of liquid-storage tank[J].Journal of Structural Engineering.1997,123(1):113-116.
[4]Malhotra P K.Seismic strengthening of liquid-storage tanks with energy-dissipating anchors[J].Journal of Structural Engineering.1998,124(4):405-414.
[5]Shrimali M K,Jangid R S.Seismic analysis of base-isolated liquid storage tanks[J].Journal of Sound and Vibration.2004(275):59-75.
[6]Shrimali M K,Jangid R.S.Non-linear seismic response of base-isolated liquid storage tanks to bi-directional excitation[J].Nuclear Engi-neering and Design.2002,217:1-20.
[7]孙建刚.弹性圆柱钢制储液容器橡胶基底隔震分析模型[J].大庆石油学院学报,1998,22(3):91-94.SUN Jiangang.Analysis model of isolation control for elasto cylindrical steel storage fluid container[J].Journal of Daqing Petroleum Institute,1998,22(3):91-94.
[8]孙建刚,张丽,袁朝庆.立式储罐基础隔震动力反应特性分析[J].地震工程与工程振动.2001,21(3):140-144.SUN Jiangang,ZHANG Li,YUAN Zhaoqing.Dynamic characteristic analysis of base isolation for vertical storage tank[J].Earthquake Engineeringand Engineering Vibration.2001,21(3):140-144.
[9]孙建刚,郝进锋,王振.储罐基底隔震振型分解反应谱计算分析研究[J].哈尔滨工业大学学报,2005,37(5):649-651.SUN Jiangang,HAO Jinfeng,Wang Zhen.Research on the calculation of the mode analysis response spectrum of the seismic base isolation steelstorage tank[J].Journal of Harbin Institute of Technology.2005,37(5):649-651.
[10]孙建刚,袁朝庆,郝进锋.橡胶基底隔震储罐地震模拟试验研究[J].哈尔滨工业大学学报,2005,37(6):806-809.SUN Jiangang,YUAN Zhaoqing,HAO Jinfeng,Experimental research on rubber base-isolation tank[J].Journal of Harbin Institute of Technolo-gy.2005,37(6):806-809.
[11]李扬,李自力,张艳铅芯橡胶支座隔震储罐地震响应特性分析[J].工程抗震与加固改造,2009,37(5):39-45.Li Yang,Li Zili,Zhang Yan.Response Characteristic of Liquid Storage Tank Isolated by Lead Rubber Bearings[J].Earthquake Resistant Engi-neering and Retrofitting.2009,37(5):39-45.
[12]李自力,李扬,李洪波.大型LRB隔震储罐地震反应参数研究[J].四川大学学报(工程科学版).2010,42(5):134-141.LI Zili,LI Yang,LI Hongbo.Parametric Research on Seismic Response of Large Scale Liquid Storage Tank Isolated by Lead-rubber Bearings[J].Journal of Sichuan University(Engineering Science Edition).2010,42(5):134-141.
[13]Kelly J M Aseismic base isolation:Reviewand bibliography[J].Soil dynamics and Earthquake Engineering.1986,5:202-216.
[14]Spencer B.F,Nagarajajah S.State of the art of structural control[J].Journal of Structural Engineering,ASCE.2003,129(7):845-856.
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