考虑SSI效应的立式储罐水平基础隔震研究
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摘要
立式储罐在地震作用下破坏严重,损失较大。为了降低立式储罐在水平地震激励下的地震响应,考虑土与结构相互作用对储罐地震响应的影响,将立式储罐基础隔震体系简化为3质点5自由度力学模型。依据Ham ilton原理建立立式储罐基础隔震体系的控制方程,给出了立式储罐基底剪力、倾覆弯矩、晃动波高和应力的理论表达。选取150 000m3储罐,采用W ilson-θ法对其进行了地震动响应分析。结果表明:储罐基础隔震体系能够降低储罐的地震响应;为获得理想的地震响应,场地、隔震周期和阻尼比存在优化取值区间;储罐抗震与减震设计要视设计安全需要来决定是否考虑土与结构的相互作用。
The vertical storage tanks are usually seriously damaged in strong earthquakes.In order to reduce seismic response of the vertical storage tanks under horizontal strong earthquake,the isolation system of the storage tank is simplified as a 3-mass 5-degrees-of-freedom model with considering soil-structure interaction.The governing equation is established based on Hamilton principle,and theoretical expressions of the base shear,overturning moment and stress are given.Seismic response analysis of a 150 000m3 storage tank is carried out with the Wilson-θ method.The results show that storage tank with the base isolation system could reduce the seismic response.It should be necessary to take the best site and optimal values of isolation period and damping ratio into account.Seismic and isolation design of storage tanks depends on design safety needs to decide on whether to consider soil-structural interaction.
The vertical storage tanks are usually seriously damaged in strong earthquakes.In order to reduce seismic response of the vertical storage tanks under horizontal strong earthquake,the isolation system of the storage tank is simplified as a 3-mass 5-degrees-of-freedom model with considering soil-structure interaction.The governing equation is established based on Hamilton principle,and theoretical expressions of the base shear,overturning moment and stress are given.Seismic response analysis of a 150 000m3 storage tank is carried out with the Wilson-θ method.The results show that storage tank with the base isolation system could reduce the seismic response.It should be necessary to take the best site and optimal values of isolation period and damping ratio into account.Seismic and isolation design of storage tanks depends on design safety needs to decide on whether to consider soil-structural interaction.
引文
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[12]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):121-126.SUN Jiangang,WANG Lili,WEI Zhizhen.Influence of seasonally frozen ground on the seismic response of tanks[J].World Earthquake Engineer-ing,2003,19(4):121-126.
[13]孙建刚,周利剑,魏志真.立志钢制储罐基于地震损伤性能的抗震设计方法[J].世界地震工程,2004,20(2):121-128.SUN Jiangang,ZHOULijian,WEI Zhizhen.A seismic design method of standing steel storage tank based on damage performance[J].World Far-thquake Engineering,2004.20(2):121-128.
[14]王振,袁朝庆,孙建刚.立式钢制储罐隔震抗震设计的工程化方法[J].世界地震工程,2000,16(4):92-95.WANG Zhen,YUAN Zhaoqing,SUN Jiangang.Engineering method of isolation desing for stand steel storage tank[J].World Earthquake Engineer-ing,2000,16(4):92-95.
[15]孙建刚.立式储液罐隔震结构的一种控制体系[J].世界地震工程,1998,14(1):34-41SUN Jiangang.A control system for the vertical liquid-storage tank isolation structures[J].World Earthquake Engineering,1998,14(1):34-41.
[2]Haroun M A.Parametric study of seismic soil-tank interaction:I.horizontal excitation[J].Journal of Engineering Mechanics,ASCE,1992,118(3):783-797.
[3]孙建刚,崔利富,张营,等.土与结构相互作用对储罐地震响应的影响[J].地震工程与工程振动,2010,30(3):141-146.SUN Jiangang,CUI Lifu,,ZHANG ying,Zhao Changjun.Research of seismic response for storage-tanks with soil-structure interaction[J].Journalof Earthquake Engineering and Engineering Vibration,2010,30(3):141-146.
[4]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,2001,3(21):140-145.SUN Jiangang,ZHANG Li,YUAN Chaoqing.Dynamic characteristic analysis of base isolation for vertical storage tank[J].Journal of EarthquakeEngineering and Engineering Vibration,2001,3(21):140-145.
[5]Haroun MA,Housner G W.Earthquake response of deformable liquid storage tanks[J].ASME J.Appl.Mech.,1981,48(2):411-418.
[6]孙建刚.大型立式储罐隔震—理论、方法及实验[M].北京:科学出版社,2009.SUN Jiangang.Isolation of large vertical storage tank—theory,method,test[M].Beijing:Science Press,2009.
[7]Malhotra P K.Newmethod for seismic base isolation of liquid storage tanks[J].Earthquake Engineering and Structural Dynamics,1997,26:839-847.
[8]Wang Y P,Teng MC,Chung K W.Seismic isolation of rigid cylindrical tanks using friction pendulum bearing[J].Earthquake Engineering andStructural Dynamics,2001,30:1083-1099.
[9]Shrimali MK,Jangid R S.Seismic response of liquid storage tanks isolated by sliding bearings[J].Eng.Strcut,2002,24(7):907-919.
[10]Shrimali MK,Jangid R S.Seismic analysis of base-isolated liquid storage tanks[J].Journal of Sound&Vibration,2004,275(1/2):59-75.
[11]孙建刚,蒋峰,张荣花.隔震立式储罐地震反应谱分析[J].世界地震工程,2009,25(2):130-139.SUN Jiangang,JIANG Feng,ZHANG Ronghua.Earthquake response spectrum analysis of storage tanks with seismic isolation[J].World Earthquakeengineering,2009,25(2):130-139.
[12]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):121-126.SUN Jiangang,WANG Lili,WEI Zhizhen.Influence of seasonally frozen ground on the seismic response of tanks[J].World Earthquake Engineer-ing,2003,19(4):121-126.
[13]孙建刚,周利剑,魏志真.立志钢制储罐基于地震损伤性能的抗震设计方法[J].世界地震工程,2004,20(2):121-128.SUN Jiangang,ZHOULijian,WEI Zhizhen.A seismic design method of standing steel storage tank based on damage performance[J].World Far-thquake Engineering,2004.20(2):121-128.
[14]王振,袁朝庆,孙建刚.立式钢制储罐隔震抗震设计的工程化方法[J].世界地震工程,2000,16(4):92-95.WANG Zhen,YUAN Zhaoqing,SUN Jiangang.Engineering method of isolation desing for stand steel storage tank[J].World Earthquake Engineer-ing,2000,16(4):92-95.
[15]孙建刚.立式储液罐隔震结构的一种控制体系[J].世界地震工程,1998,14(1):34-41SUN Jiangang.A control system for the vertical liquid-storage tank isolation structures[J].World Earthquake Engineering,1998,14(1):34-41.
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