大型LRB隔震储罐地震反应参数研究
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摘要
铅芯橡胶支座(LRB)支座参数的最优设计范围是大型隔震储罐研究的关键问题。研究利用Bouc-Wen模型模拟LRB的力-变形非线性行为,结合Newmark增量法和龙格库塔积分法求解隔震储罐非线性动力方程,得到不同类型场地上大型LRB隔震储罐的地震响应特点,总结出LRB参数对大型隔震储罐地震反应(基底剪力、支座位移、晃动波高)的影响规律。研究表明:支座隔震频率是影响大型隔震储罐减震性能的主要参数。I类场地上最优隔震频率范围为0.5～5rad/s,Ⅱ类、Ⅲ类场地上最优隔震频率范围为2～5rad/s,Ⅳ类场地上最优隔震频率范围为1.5～3rad/s。支座屈服强度对储罐地震响应的影响取决于场地类型和隔震频率。在Ⅱ类和Ⅲ类场地上存在最优屈服强度使得基底剪力最小,并且最优屈服强度随隔震频率增加而增大。
The optimum range of parameters of lead rubber bearing(LRB) for large scale base-isolated tank on different sites is a crucial problem in the research of isolated tank.The Bouc-Wen model was adopted to simulate the nonlinear hysteretic characteristics of force-displacement relationship for LRB.The nonlinear equations of motion of isolated tank was solved by the Newmark's step-by-step method and Runge-kutta method.The seismic response of the large scale based-isolated storage tank with LRB was investigated And the influence of LRB parameters on the response of large scale base-isolated tank on different sites was analyzed.The result indicated that the isolation frequency is the primary parameter that affects the seismic response of the isolated tank.The optimal ranges of isolation frequency of large scale base-isolated tank for site I,site Ⅱ,site Ⅲ,and site Ⅳ are 0.5 ~ 5 rad /s,2 ~ 5 rad /s,2 ~ 5 rad /s and 1.5 ~ 3 rad /s respectively.The influence of the yield strength on the seismic response of tank depends on the site type and isolation frequency.There are optimum yield strength that make the base shear attain the minimum value on site Ⅱ and site Ⅲ.Further,the optimum yield strength increases as the isolation frequency increases.
The optimum range of parameters of lead rubber bearing(LRB) for large scale base-isolated tank on different sites is a crucial problem in the research of isolated tank.The Bouc-Wen model was adopted to simulate the nonlinear hysteretic characteristics of force-displacement relationship for LRB.The nonlinear equations of motion of isolated tank was solved by the Newmark's step-by-step method and Runge-kutta method.The seismic response of the large scale based-isolated storage tank with LRB was investigated And the influence of LRB parameters on the response of large scale base-isolated tank on different sites was analyzed.The result indicated that the isolation frequency is the primary parameter that affects the seismic response of the isolated tank.The optimal ranges of isolation frequency of large scale base-isolated tank for site I,site Ⅱ,site Ⅲ,and site Ⅳ are 0.5 ~ 5 rad /s,2 ~ 5 rad /s,2 ~ 5 rad /s and 1.5 ~ 3 rad /s respectively.The influence of the yield strength on the seismic response of tank depends on the site type and isolation frequency.There are optimum yield strength that make the base shear attain the minimum value on site Ⅱ and site Ⅲ.Further,the optimum yield strength increases as the isolation frequency increases.
引文
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[15]Park J,Otsuka H.Optimal yield level of bilinear seismic isolation devices[J].Earthquake Engng Struct Dyn,1999,28:941-955.
[2]Li Hongpei,Sun Hongling,Zhang Peng.Analysis on building damages in the Wenchuan Earthquake and discussions on some problems of seismic resistance of buildings[J].Journal of Sichuan University:Engineering Science Edition,2009,41(3):130-134.[李红培,孙鸿玲,张鹏.汶川地震房屋建筑破坏分析与建筑抗震问题探讨[J].四川大学学报:工程科学版,2009,41(3):130-134.]
[3]周福霖.工程结构减震控制[M].北京:地震出版社,1997.
[4]Zayas V A,Low S S.Application of seismic isolation to industrial[J].Pressure Vessels and Piping,1995,319:273-288.
[5]Malhotra P K.Method for seismic base isolation of liquid-storage tank[J].Journal of Structural Engineering,1997,123(1):113-116.
[6]Malhotra P K.Seismic strengthening of liquid-storage tanks with energy-dissipating anchors[J].Journal of Structural Engineering,1998,124(4):405-414.
[7]Shrimali M K,Jangid R S.Seismic analysis of base-isolated liquid storage tanks[J].Journal of Sound and Vibration,2004,275:59-75.
[8]Liang Bo,Tang Jiaxiang.Vibration studies of base isolated storage tanks[J].Computers and Structures,1994,52:1051-1059.
[9]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.[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].
[10]Sun Jiangang,Zhang Li,Yuan Zhaoqing.Dynamic characteristic analysis of base isolation for vertical storage tank[J].Earthquake Engineering and Engineering Vibration,2001,21(3):140-144.[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.]
[11]Sun Jiangang,Hao Jinfeng,Wang Zhen.Research on the calculation of the mode analysis response spectrum of the seismic base isolation steel storage tank[J].Journal of Harbin Institute of Technology,2005,37(5):649-651.[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.]
[12]Wang Li,Yan Weiming,Yan Guiping.Effect of the LRB parameters on the dynamic response of isolated bridges[J].Journal of Beijing Polytechnic University,2004,30(3):304-308.[王丽,阎维明,阎贵平.铅芯橡胶支座参数对隔震桥梁动力响应的影响[J].北京工业大学学报,2004,30(3):304-308.]
[13]Zhang Yanhong,Hu Xiao.Study on seismic isolation technology for large aqueducts[J].Journal of Hydraulic Engineering,2005,36(11):1308-1313.[张艳红,胡晓.大型渡槽隔震研究[J].水利学报,2005,36(11):1308-1313.]
[14]Tian Jie,Zhang Junfa,Liu Yunhe.Research on optimum parameters of base-isolated buildings with lead laminated rubber bearings[J].World Information on Earthquake Engineering,2003,19(1):158-163.[田洁,张俊发,刘云贺.铅芯橡胶支座基础隔震体系参数优化配置研究[J].世界地震工程,2003,19(1):158-163.]
[15]Park J,Otsuka H.Optimal yield level of bilinear seismic isolation devices[J].Earthquake Engng Struct Dyn,1999,28:941-955.
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