考虑桩土-隔震层-罐体相互作用的隔震储罐地震响应分析
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摘要
为了研究桩土、隔震层与罐体相互作用对15×104m3隔震储罐地震响应的影响,桩与隔震层采用弹簧-阻尼单元,罐体采用壳单元,流体采用势流体单元,基于ADINA建立数值仿真分析模型,在8度El Centro地震动激励下,应用Newmark数值积分方法进行地震响应分析。结果表明:隔震储罐基底剪力和基底弯矩相对于非隔震储罐明显降低,储罐罐壁加速度沿罐壁高度方向近乎平动,但对波高的控制效果不明显;除罐壁顶部外,动液压力明显降低;隔震后,罐壁有效应力和环向应力减震效应明显,对轴向应力和径向应力影响较小,建议从安全角度考虑,储罐非隔震设计时不考虑桩土作用,隔震设计时考虑桩土对罐体的影响。
For researching the influence on the seismic responses of storage tank with volume 15 × 104m3 and isolation,which comes from the interaction among pile-soil,isolation layer and tank body,inputting El Centro ground motion with seismic intensity Ⅷ,using the numerical integration method of Newmark and imitating piles and isolation with spring-damping element,tank body with shell element and liquid with potential-fluid element,we get the seismic responses of the structure that: the base shear force and base bend moment of the isolated storage tank decrease apparently compared with the non-isolated one,and the accelerations of the tank wall vary smoothly along the tank height,but the sloshing wave height is not controlled well;dynamic liquid pressures decrease obviously except at the top of the tank;after using isolation,the effective stress and circle stress of the tank wall decrease well,but the axial stress and radial stress don’t change obviously.We propose not to consider the pile-soil effect while designing storage tank without isolation and to consider this effect while designing storage tank with isolation.
For researching the influence on the seismic responses of storage tank with volume 15 × 104m3 and isolation,which comes from the interaction among pile-soil,isolation layer and tank body,inputting El Centro ground motion with seismic intensity Ⅷ,using the numerical integration method of Newmark and imitating piles and isolation with spring-damping element,tank body with shell element and liquid with potential-fluid element,we get the seismic responses of the structure that: the base shear force and base bend moment of the isolated storage tank decrease apparently compared with the non-isolated one,and the accelerations of the tank wall vary smoothly along the tank height,but the sloshing wave height is not controlled well;dynamic liquid pressures decrease obviously except at the top of the tank;after using isolation,the effective stress and circle stress of the tank wall decrease well,but the axial stress and radial stress don’t change obviously.We propose not to consider the pile-soil effect while designing storage tank without isolation and to consider this effect while designing storage tank with isolation.
引文
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[13]孙颖.大型立式储罐抗震性能与隔震效应数值分析[D].大庆:东北石油大学,2012.SUN Ying.Seismic performance and isolation effective of large vertical liquid storage tank[D].Daqing:Northeast Petroleum University,2012.(in Chinese)
[14]JGJ94-2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.JGJ94-2008 Technical Code for Building Pile Foundation[S].Beijing:China Architecture&Building Press,2008.(in Chinese)
[2]Shekari M R,Khaji N,Ahmadi M T.On the seismic behavior of cylindrical base-isolated liquid storage tanks excited by long-period ground motions[J].Soil Dynamics and Earthquake Engineering,2010,30:968-980.
[3]Sonia D P,Mistry B B,Panchal V R.Double variable frequency pendulum isolator for seismic isolation of liquid storage tanks[J].Nuclear Engi-neering and Design,2011,241:700-713
[4]Ayman A.Seleemah,Mohamed El-Sharkawy Seismic response of base isolated liquid storage ground tanks[J].Ain Shams Engineering Journal2011,2:33-42.
[5]Haroun M A.Vibration studies and tests of liquid storage tanks[J].Earthq.Eng.Struct.Dyn.,1983,11:179-206.
[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.(in Chinese)SUN Jiangang.Isolation of large vertical storage tank———theory,method,test[M].Beijing:Science Press,2009.
[7]张云峰.立式储罐并联隔震基础研究[D].大庆:大庆石油学院,2009.ZHANG Yunfeng.Research on the parallel base-isolation of vertical storage tanks[D].Daqing:Daqing Petroleum Institute,2009.(in Chinese)
[8]崔利富.立式储罐三维基础隔震体系动响应分析研究[D].大庆.大庆石油学院.2008.CUI Lifu.Research on the dynamic response analysis of three-dimensional seismic base isolation system of stand storage tanks[D].Daqing:DaqingPetroleum Institute,2008.(in Chinese)
[9]张亮.立式钢制储罐并联基础隔震研究[D].大庆.大庆石油学院,2009.ZHANG Liang.Research on parallel base isolation of vertical steel storage tanks.[M].Daqing:Daqing Petroleum Institute,2009.(in Chinese)
[10]宫克勤.新型立式储罐结构体系地震响应分析[D].大庆:大庆石油学院,2007.GONG Keqin.Earthquake response analysis of the vertical storage tank with new type structure[D].Daqing:Daqing Petroleum Institute,2007.(in Chinese)
[11]杨宇.双向地震作用立式储罐基础隔震研究[D].大庆:东北石油大学,2011.YAN Yu.Earthquake response analysis of the vertical storage tank with new type structure[D].Daqing:Northeast Petroleum University,2011.(in Chinese)
[12]邹徳磊.双向地震激励下非线性隔震立式浮顶储罐地震响应研究[D].大庆:东北石油大学,2012.ZHOU Delei.Study on non-liner seismic response of base-isolated liquid storage tanks with floating roof to bi-directional excitation[D].Daqing:Northeast Petroleum University,2012.(in Chinese)
[13]孙颖.大型立式储罐抗震性能与隔震效应数值分析[D].大庆:东北石油大学,2012.SUN Ying.Seismic performance and isolation effective of large vertical liquid storage tank[D].Daqing:Northeast Petroleum University,2012.(in Chinese)
[14]JGJ94-2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.JGJ94-2008 Technical Code for Building Pile Foundation[S].Beijing:China Architecture&Building Press,2008.(in Chinese)
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