大型LNG储罐的可靠度分析
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摘要
以储液容积为16万m~3的大型LNG储罐为工程背景,采用ANSYS有限元分析软件建立分析模型,通过其可靠度分析模块(PDS)中的响应面法对储罐的单元失效概率进行分析,提出了失效单元相应的可靠指标;通过等效线性求交法逐步找出储罐的失效路径,提出了一种搜寻结构体系失效路径的新方法,根据结构体系的界限估计法求得储罐在地震作用下的体系可靠指标范围。同时指出,储罐体系的破坏是由罐壁顶部的强度破坏与罐壁底部的强度破坏两种主要失效模式所组成的串联系统的破坏。本文的研究可为完善大型LNG储罐可靠度分析理论和国产化设计提供参考。
Based on an actual large LNG storage tank with a volume of 160,000m~3,the model was set by ANSYS software,the unit failure rate was analyzed through using response surface method in PDS,and the reliability index of failure unit was proposed.A failure path could be found by equivalent linearization method,and a new method of searching for structure failure paths was proposed.The scope of system reliability index was obtained according to the boundary estimation method of the structural system.Besides,it is pointed out that the strength destruction of tank walls including both the top and bottom tank walls was considered as the most primary modality.The paper would provide useful information for further improving reliability theory and domestic deign for large-scale LNG storage tanks.
Based on an actual large LNG storage tank with a volume of 160,000m~3,the model was set by ANSYS software,the unit failure rate was analyzed through using response surface method in PDS,and the reliability index of failure unit was proposed.A failure path could be found by equivalent linearization method,and a new method of searching for structure failure paths was proposed.The scope of system reliability index was obtained according to the boundary estimation method of the structural system.Besides,it is pointed out that the strength destruction of tank walls including both the top and bottom tank walls was considered as the most primary modality.The paper would provide useful information for further improving reliability theory and domestic deign for large-scale LNG storage tanks.
引文
[1]杨建江,慈芳.大型LNG储罐在高温状态下外壁温度场及应力分布有限元分析[J].天津大学学报,2012,45(6):505-510Yang Jian-jiang,Ci Fang.Finite Element Analysis of Wall Temperature Field and Stress Distribution of Large LNG Storage Tank at High Temperature[J].Journal of Tianjin University,2012,45(6):505-510(in Chinese)
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[3]Ellen H.McInerney,Ryan J.Hart.New Quantitative Risk Criteria for US LNG Facilities[J].Process Safety Progress,27 Jan 2014:1-10
[4]Chung Kyun Kim,Kih Heahn Hahm.Leak-Proof Safety Analysis of a Full Containment LNG Storage Tank[C].GASEX 2002 Brunei Damssalam
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[9]刘天云,赵国藩.一种识别结构主要失效模式的有效算法[J].大连理工大学学报,1998,38(1):97-100Liu Tian-yun,Zhao Guo-fan.An Effective Algorithm for Identifying Structural Dominant Failure Modes[J].Journal of Dalian University of Technology,1998,38(1):97-100(in Chinese)
[10]蔡迎建,孙焕纯.结构失效模式的快速识别方法[J].大连理工大学学报,1999,39(4):489-493Cai Ying-jian,Sun Huan-chun.Fast Identification for Failure Modes of Structural System[J].Journal of Dalian University of Technology,1999,39(4):489-493(in Chinese)
[11]查支祥,吴佳雄.圆柱壳中无粘结预应力筋的等效荷载计算方法[J].工业建筑(增刊).2007,37:257-260,270Zha Zhi-xiang,Wu Jia-xiong.The Computing Method of Equivalent Load of Unbonded Prestressed Reinforced Steel Bar in Cylinder Shell[J].Industrial Construction(Supplement),2007,37:257-260,270(in Chinese)
[12]刘宁.可靠度随机有限元法及其工程应用[M].北京:中国水利水电出版社,2001Liu Ning.The Reliability Stochastic Fern and Its Applications in Engineering[M].Beijing:China Water Power Press,2001(in Chinese)
[2]Yoshinori Kawamura,Masafumi Nakano.Recent Technological Development of in-Ground LNG Storage Tank at Tokyo Gas'Ohgishima Terminal[C].22nd World Gas Conference,2003.http://www.igu.org/html/wgc2003/WGC_pdffil es/10324_1045786445_4481_1.pdf
[3]Ellen H.McInerney,Ryan J.Hart.New Quantitative Risk Criteria for US LNG Facilities[J].Process Safety Progress,27 Jan 2014:1-10
[4]Chung Kyun Kim,Kih Heahn Hahm.Leak-Proof Safety Analysis of a Full Containment LNG Storage Tank[C].GASEX 2002 Brunei Damssalam
[5]柳春光,李会军.大跨度双层柱面网壳结构的非线性有限元可靠度、相关性及灵敏度分析[J].天津大学学报,2010,43(3):239-248Liu Chun-guang,Li Hui-jun.Nonlinear Finite Element Analysis on Reliability,Correlation and Sensitivity of Large-Span DoubleLayer Cylindrical Lattice Shell[J].Journal of Tianjin University,2010,43(3):239-248(in Chinese)
[6]Terje Haukaas,Michael H.Scott.Shape sensitivities in the reliability analysis of nonlinear frame structures[J].Computers and structures,2006,84:964-977
[7]Abhijit Chaudhuri,Subrata Chakraborty.Sensitivity evaluation in seismic reliability analysis of structures[J].Computer methods in applied mechanics and engineering,2004,193:59-68
[8]李思.全容式LNG储罐的地震响应分析[D].天津:天津大学建筑工程学院,2010Li Si.The Seismic Response Analysis of Full Containment LNG Storage Tank[D].Tianjin:School of Civil Engineering,Tianjin University,2010(in Chinese)
[9]刘天云,赵国藩.一种识别结构主要失效模式的有效算法[J].大连理工大学学报,1998,38(1):97-100Liu Tian-yun,Zhao Guo-fan.An Effective Algorithm for Identifying Structural Dominant Failure Modes[J].Journal of Dalian University of Technology,1998,38(1):97-100(in Chinese)
[10]蔡迎建,孙焕纯.结构失效模式的快速识别方法[J].大连理工大学学报,1999,39(4):489-493Cai Ying-jian,Sun Huan-chun.Fast Identification for Failure Modes of Structural System[J].Journal of Dalian University of Technology,1999,39(4):489-493(in Chinese)
[11]查支祥,吴佳雄.圆柱壳中无粘结预应力筋的等效荷载计算方法[J].工业建筑(增刊).2007,37:257-260,270Zha Zhi-xiang,Wu Jia-xiong.The Computing Method of Equivalent Load of Unbonded Prestressed Reinforced Steel Bar in Cylinder Shell[J].Industrial Construction(Supplement),2007,37:257-260,270(in Chinese)
[12]刘宁.可靠度随机有限元法及其工程应用[M].北京:中国水利水电出版社,2001Liu Ning.The Reliability Stochastic Fern and Its Applications in Engineering[M].Beijing:China Water Power Press,2001(in Chinese)
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