隔震立式储罐地震反应谱分析
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摘要
基于反应谱理论,研究了的基底隔震储罐的地震响应问题。将储罐简化为三质点体系力学模型,罐内连续液体质量等效为对流质量、脉冲质量和刚性质量,并引入隔震刚度。与时程分析对比,验证反应谱法的适用性,分析隔震立式储罐的地震响应并研究主要参数对隔震储液罐地震响应的影响,主要考虑的参数有:(1)场地类别;(2)隔震周期;(3)高径比。结果表明:反应谱法计算隔震立式储罐地震响应是偏于安全的;随着场地类别和隔震周期的增大,基底剪力减震率逐渐降低,晃动波高变化不明显,隔震后,液动压力呈线性变化,液动压力随着场地类别和高径比的增大而增大,随着隔震周期的增大而减小;高径比存在一定的优化段,在优化段内,基底剪力减震率较大,隔震效果较好。
Based on response spectrum theory,the earthquake response of the storage tanks with seismic isolation is investigated.The tank is simplified as three-particle system model.The continuous liquid mass is lumped as convective mass,impulsive mass and rigid mass respectively,and the base isolation stiffness is introduced.In order to determine dynamic magnification factor,the dynamic behaviour and the earthquake response of the seismic isolation storage tanks are analyzed.The suitability of response spectrum method is proved,the results are compared with the time history method.A parametric study is also conducted to research the effects of important parameters of the system on the effectiveness of seismic isolation of the storage tanks.The various parameters considered are(1) the site classification,(2) the period of isolation and(3) the ratio of height to radius.It has found that the earthquake response of the storage tanks with the seismic isolation calculated by response spectrum method is in safe side;the base shear ratio of the seismic isolation tanks decreases with increase of the site classification and the period of isolation.Sloshing wave height ratio of the storage tanks has no significantly change.After isolation,hydrodynamic pressure exhibits linear change,increases with increase of the site classification and the ratio of height to radius,and decreases with increase of the period of isolation.The ratio of height to radius exists an optimum segment.In the range of optimum segment,the base shear ratio is larger,the isolating effectiveness is better.
Based on response spectrum theory,the earthquake response of the storage tanks with seismic isolation is investigated.The tank is simplified as three-particle system model.The continuous liquid mass is lumped as convective mass,impulsive mass and rigid mass respectively,and the base isolation stiffness is introduced.In order to determine dynamic magnification factor,the dynamic behaviour and the earthquake response of the seismic isolation storage tanks are analyzed.The suitability of response spectrum method is proved,the results are compared with the time history method.A parametric study is also conducted to research the effects of important parameters of the system on the effectiveness of seismic isolation of the storage tanks.The various parameters considered are(1) the site classification,(2) the period of isolation and(3) the ratio of height to radius.It has found that the earthquake response of the storage tanks with the seismic isolation calculated by response spectrum method is in safe side;the base shear ratio of the seismic isolation tanks decreases with increase of the site classification and the period of isolation.Sloshing wave height ratio of the storage tanks has no significantly change.After isolation,hydrodynamic pressure exhibits linear change,increases with increase of the site classification and the ratio of height to radius,and decreases with increase of the period of isolation.The ratio of height to radius exists an optimum segment.In the range of optimum segment,the base shear ratio is larger,the isolating effectiveness is better.
引文
[1]孙建刚.立式储罐地震响应控制研究[D].哈尔滨:中国地震局工程力学研究所,2002.
[2]Shrimali MK,Jangid RS.Seismic response of liquid storage tanks isolated by sliding bearings[J].Engineering Structures,2002,24(7):909-921.
[3]Haroun MA,Abou-Izzeddine W.Parametric study of seismic soil-tank interaction.I:horizontal excitation[J].Journal of structural Engineering,1992,118(3):783-797.
[4]孙建刚,周丽,袁朝庆,等.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(2):140-144.
[5]Malhotra.New method for seismic lsolation of liquid-storage Tanks[J].Earthquake Engineering and Structural Dynamics,1997,26(3):839-847.
[6]Malhotra.Seismic response of soil supported unanchored liquid-Storage tanks[J].Journal of Structural Engineering,ASCE,1997,123(4):440-450.
[7]Veletsos,Tang.Dynamic of vertically excited liquid storage tanks[J].Journal of Structural Engineering,1986,112(6):113-116.
[8]Hamdan FH.Seismic behavior of cylindrical steel liquid storage tanks[J].Journal of Constructional Steel Research,2000,53(4):307-333.
[9]倪国葳,张玉敏,赵亚敏.建筑结构基础隔震分析[J].地震工程与工程振动,2006,3(26):206-209.
[10]周福霖.工程结构减震控制[M].北京:中国地震出版社,1997.
[11]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):650-651,712.
[2]Shrimali MK,Jangid RS.Seismic response of liquid storage tanks isolated by sliding bearings[J].Engineering Structures,2002,24(7):909-921.
[3]Haroun MA,Abou-Izzeddine W.Parametric study of seismic soil-tank interaction.I:horizontal excitation[J].Journal of structural Engineering,1992,118(3):783-797.
[4]孙建刚,周丽,袁朝庆,等.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(2):140-144.
[5]Malhotra.New method for seismic lsolation of liquid-storage Tanks[J].Earthquake Engineering and Structural Dynamics,1997,26(3):839-847.
[6]Malhotra.Seismic response of soil supported unanchored liquid-Storage tanks[J].Journal of Structural Engineering,ASCE,1997,123(4):440-450.
[7]Veletsos,Tang.Dynamic of vertically excited liquid storage tanks[J].Journal of Structural Engineering,1986,112(6):113-116.
[8]Hamdan FH.Seismic behavior of cylindrical steel liquid storage tanks[J].Journal of Constructional Steel Research,2000,53(4):307-333.
[9]倪国葳,张玉敏,赵亚敏.建筑结构基础隔震分析[J].地震工程与工程振动,2006,3(26):206-209.
[10]周福霖.工程结构减震控制[M].北京:中国地震出版社,1997.
[11]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):650-651,712.
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