储油罐的自振特性与抗震性能分析
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摘要
为获得储油罐的自振特性和抗震性能,采用有限元软件ANSYS建立了储油罐液固耦合的有限元模型,对模型进行自振特性分析,得到其自振频率和振型,通过频率计算结果与文献、规范进行对比,结果吻合良好,验证了模型的正确性。对模型进行多遇地震作用下的时程响应分析,得到各节点位移、加速度和等效应力极值沿罐壁高度的分布情况,确定了可能发生"象足"和"菱形"破坏的位置。进一步对模型进行罕遇地震作用下时程响应分析,结果表明军遇地震下,储油罐的最大轴向应力均超出许用临界应力,储油罐在军遇地震作用下会发生屈曲破坏。
In order to study the natural vibration property and seismic characteristics of oil storage tank,liquid and solid coupling finite element model was established by using ANSYS.The natural vibration characteristics of this model were analyzed,and the natural frequency and vibration modes were obtained.Comparing these results with the data from references and codes,it was found that the results from the analysis were perfectly coincided with that from these references,with which the correction of the model has been verified.By analyzing time history response of the model under frequent earthquake,the distributions of displacement,acceleration and equal maximum stress along the height of tank were obtained,then,the locations at which failure of "elephant foot" and "diamond" may occur were determined.Furthermore,time history response analysis was made to the model under rare earthquake, it was shown that under this condition,the maximum axial stress in oil storage tank exceeded allowable critical stress,and buckling failure will occur in the tank under rare earthquake condition.
In order to study the natural vibration property and seismic characteristics of oil storage tank,liquid and solid coupling finite element model was established by using ANSYS.The natural vibration characteristics of this model were analyzed,and the natural frequency and vibration modes were obtained.Comparing these results with the data from references and codes,it was found that the results from the analysis were perfectly coincided with that from these references,with which the correction of the model has been verified.By analyzing time history response of the model under frequent earthquake,the distributions of displacement,acceleration and equal maximum stress along the height of tank were obtained,then,the locations at which failure of "elephant foot" and "diamond" may occur were determined.Furthermore,time history response analysis was made to the model under rare earthquake, it was shown that under this condition,the maximum axial stress in oil storage tank exceeded allowable critical stress,and buckling failure will occur in the tank under rare earthquake condition.
引文
[1]孙建刚.立式储罐地震响应控制研究[D].中国地震局工程力学研究所,2002.
[2]孙建刚,周利剑.立式储罐与地基相互作用动力特性分析[J].地震工程与工程振动,2006,26(3):232—234.
[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.
[4]周利剑.水平地震激励下立式储罐与地基相互作用动力响应分析[D].哈尔滨:哈尔滨工程大学,2006.
[5]周利剑,黄兢,王向英,等.内罐泄漏条件下LNG储罐外罐地震响应分析[J].压力容器,2012,29(1):16-20.
[6]张艳,立式圆柱形储罐地震响应研究[D].中国石油大学, 2009
[7]潘栋,邓民宪.基于ANSYS的储液罐固有振动特性分析[J].西部探矿工程,2008(5):52-54.
[8]GB 50191—1993,构筑物抗震设计规范[S].北京:中国计划出版社,1993.
[2]孙建刚,周利剑.立式储罐与地基相互作用动力特性分析[J].地震工程与工程振动,2006,26(3):232—234.
[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.
[4]周利剑.水平地震激励下立式储罐与地基相互作用动力响应分析[D].哈尔滨:哈尔滨工程大学,2006.
[5]周利剑,黄兢,王向英,等.内罐泄漏条件下LNG储罐外罐地震响应分析[J].压力容器,2012,29(1):16-20.
[6]张艳,立式圆柱形储罐地震响应研究[D].中国石油大学, 2009
[7]潘栋,邓民宪.基于ANSYS的储液罐固有振动特性分析[J].西部探矿工程,2008(5):52-54.
[8]GB 50191—1993,构筑物抗震设计规范[S].北京:中国计划出版社,1993.
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