基于ANSYS的储液池边界土弹簧刚度分析
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摘要
近年来,随着地下结构数量的增多和震害的频繁出现,储液池因功能的特殊性,其抗震设计日益受到重视。场地土的动力特性直接影响储液池结构的抗震性能,因此考虑土层动力特性的土弹簧刚度分析是十分必要的。首先依据场地土类别和结构的固有周期,计算结构的基准水平震度k_(h0),使用震度法,依据k_(h0)计算动荷载并对整体模型进行静力线弹性计算,得到两级地震、四个加震方向共8个工况下与结构相邻各侧土层的平均剪切角γ;其次依据土层G/G_0-γ曲线,计算每个工况下各侧土层动剪切模量值G并分析影响因素;最后由G计算土弹簧刚度用以模拟各侧土和储液池的动力作用关系。通过本文分析,为模拟地下储液池与场地土动力相互作用的土弹簧刚度分析提供了一种简易、可行的方法。
In recent years,with the increasing of the underground structure number and the frequent appearance of earthquakes,the seismic design of reservoirs receive increasing attention owing to its particularity of function.Dynamic characteristics of site soil directly affects the seismic performance of underground structures,on which,the analysis of soil spring stiffness considering the dynamic characteristics of the soil is necessary.Firstly,this paper computed the basic seismic intensity k_(h0) based on classifications of site soil and the inherent cycle of structures,and then adopted seismic degree method to calculate dynamic loads and the overall elastic model to get the average shear angle γ of soils adjacent to the structure under 8cases(two earthquakes and four directions applied shock);secondly,dynamic shear modulus G of each side's soils of every case were calculated and its influence factors were analyzed based on G/G_0-γ curves;finally,soil spring stiffness was calculated to simulate the interaction between soil and reservoir according to G.Through the analysis of this paper,it provided a simple and practical method for analysising soil spring stiffness of simulating the dynamic interactions between the reservoir and soil.
In recent years,with the increasing of the underground structure number and the frequent appearance of earthquakes,the seismic design of reservoirs receive increasing attention owing to its particularity of function.Dynamic characteristics of site soil directly affects the seismic performance of underground structures,on which,the analysis of soil spring stiffness considering the dynamic characteristics of the soil is necessary.Firstly,this paper computed the basic seismic intensity k_(h0) based on classifications of site soil and the inherent cycle of structures,and then adopted seismic degree method to calculate dynamic loads and the overall elastic model to get the average shear angle γ of soils adjacent to the structure under 8cases(two earthquakes and four directions applied shock);secondly,dynamic shear modulus G of each side's soils of every case were calculated and its influence factors were analyzed based on G/G_0-γ curves;finally,soil spring stiffness was calculated to simulate the interaction between soil and reservoir according to G.Through the analysis of this paper,it provided a simple and practical method for analysising soil spring stiffness of simulating the dynamic interactions between the reservoir and soil.
引文
[1]刘云贺,王克成,陈厚群.储液池的抗震问题探讨[J].地震工程与工程振动,2005,25(1):149-154
[2]曹炳政,罗奇峰,马硕,等.神户大开地铁车站的地震反应分析[J].地震工程与工程震动,2002,22(4):102-107
[3]葛颂.大型立式储液罐抗震分析的数值模拟研究[D].浙江大学,2006
[4]刘筠.既有矩形水池的抗震性能诊断[D].天津大学,2011
[5]丁晓敏,张季超,朱超,等.基于MIDAS/GEN的地下结构抗震设计分析[J].建筑结构,2010,40(6):21-24
[6]刘晶波,李彬,刘祥庆.地下结构抗震设计中的静力弹塑性分析方法[J].土木工程学报,2007,40(7):68-76
[7]Idriss I M,Sun J I.SHAKE91:A computer program for conducting equivalent linear seismic response analysis of horizontally layered soil deposits User's Guide[R].California:University of California,Davis,1992
[8]土木学会.耐震基準等に关する提言[R].1995
[9][日]日本水道协会编.水道施设耐震工法指针[S]·解说.东京:日本水道协会,2009
[10]孙利民,刘东,潘龙.桩-土相互作用集中质量模型的土弹簧刚度计算方法[C].第十四届全国桥梁学术会议论文集,2000:691-698
[11]李亚东.区域性土的动力特性及对地下结构抗震分析的影响[D].广东大学,2011
[2]曹炳政,罗奇峰,马硕,等.神户大开地铁车站的地震反应分析[J].地震工程与工程震动,2002,22(4):102-107
[3]葛颂.大型立式储液罐抗震分析的数值模拟研究[D].浙江大学,2006
[4]刘筠.既有矩形水池的抗震性能诊断[D].天津大学,2011
[5]丁晓敏,张季超,朱超,等.基于MIDAS/GEN的地下结构抗震设计分析[J].建筑结构,2010,40(6):21-24
[6]刘晶波,李彬,刘祥庆.地下结构抗震设计中的静力弹塑性分析方法[J].土木工程学报,2007,40(7):68-76
[7]Idriss I M,Sun J I.SHAKE91:A computer program for conducting equivalent linear seismic response analysis of horizontally layered soil deposits User's Guide[R].California:University of California,Davis,1992
[8]土木学会.耐震基準等に关する提言[R].1995
[9][日]日本水道协会编.水道施设耐震工法指针[S]·解说.东京:日本水道协会,2009
[10]孙利民,刘东,潘龙.桩-土相互作用集中质量模型的土弹簧刚度计算方法[C].第十四届全国桥梁学术会议论文集,2000:691-698
[11]李亚东.区域性土的动力特性及对地下结构抗震分析的影响[D].广东大学,2011
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