LNG储罐高低承台桩基础抗震性能对比分析
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摘要
目前全容式LNG储罐基础常采用低承台和高承台桩基2种形式。采用弹性振动理论,并考虑壳液耦联振动效应,对全容式储罐高、低承台桩基的抗震性能进行对比分析,给出了2种桩基础形式下全容式LNG储罐结构与基础的震动特性,包括自振周期、单桩水平地震力、抗倾覆性能、罐底周边单位长度上的提离力、储液晃动周期以及晃动波高等。分析表明,高承台桩基的水平地震响应大于低承台8.69%、垂直地震响应大于6.34%;低承台桩基的抗倾覆能力比高承台高12.11%,抗提离能力高于高承台储罐11.42%;高承台的自振周期高于低承台;低承台基础结构的抗震能力要优于高承台基础结构。其结论对桩基础全容式LNG储罐的设计与施工具有一定的参考价值。
The pile foundations of full containment LNG storage tanks have usually two kinds of forms:the low cap pile foundations and the high cap pile foundations.Based on elastic vibration theory and considering the shell liquid coupled vibrations effect,the aseismic properties are analyzed for the storage tanks of high and low cap pile foundations.The vibration characteristics of the full containment LNG storage tanks of the two forms of pile foundations are given,including the structural natural period,the horizontal seismic force of single pile,resistive overturning capability,the uplift force of unit length around tank bottom,and the sloshing period and sloshing wave height of the liquid and so on.Analysis results have shown that the horizontal seismic response of the high cap pile foundation is 8.69% more than the low cap;and vertical seismic response is 6.34% more than the low cap;the resistive overturning capacity of the low cap pile foundation is more 12.11%than the high cap;and the uplift force is 11.42% more than the high cap;the structural natural period of the high cap is more than that of the low cap.Generally,the aseismic properties of the low cap pile foundation structure is preferable to the high cap pile foundation structure.The given conclusions have certain reference value to the design and the construction of the full containment LNG storage tank pile foundations.
The pile foundations of full containment LNG storage tanks have usually two kinds of forms:the low cap pile foundations and the high cap pile foundations.Based on elastic vibration theory and considering the shell liquid coupled vibrations effect,the aseismic properties are analyzed for the storage tanks of high and low cap pile foundations.The vibration characteristics of the full containment LNG storage tanks of the two forms of pile foundations are given,including the structural natural period,the horizontal seismic force of single pile,resistive overturning capability,the uplift force of unit length around tank bottom,and the sloshing period and sloshing wave height of the liquid and so on.Analysis results have shown that the horizontal seismic response of the high cap pile foundation is 8.69% more than the low cap;and vertical seismic response is 6.34% more than the low cap;the resistive overturning capacity of the low cap pile foundation is more 12.11%than the high cap;and the uplift force is 11.42% more than the high cap;the structural natural period of the high cap is more than that of the low cap.Generally,the aseismic properties of the low cap pile foundation structure is preferable to the high cap pile foundation structure.The given conclusions have certain reference value to the design and the construction of the full containment LNG storage tank pile foundations.
引文
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[3]袁朝庆,孙建刚,徐松芝.储罐抗震计算模型的简化[J].压力容器,2008,25(4):16-20.YUAN Zhao-qing,SUN Jian-gang,XU Song-zhi.Simplification for aseismic computing model of storage tank[J].Pressure Vessel,2008,25(4):16-20.
[4]董靖伟.50000m3浮顶储罐的抗震设计验算[J].化工设备设计,1997,34(2):10-13.Dong jin-wei.50000m3floating roof tank seismic design calculation[J].Chemical Equipment Design,1997,34(2):10-13.
[5]林衡.储罐抗震计算的讨论[J].化工设备与管道,2002,39(6):16-17.LIN Heng.Discussion of seismic resistance calculation for storage tank[J].Chemical Equipment and Piping,2002,39(6):16-17.
[6]李梁峰,林建华.大型储罐抗震能力可靠度评估[J].地震工程与工程振动,2004,24(4):152-157.LI Liang-feng,LIN Jian-hua.Reliability-evaluation of earthquake-resistant capacity for large storage tank[J].Earthquake Engineering and Engineering Vibration,2004,24(4),152-157.
[7]王建军,李其汉.自由液面大幅晃动的流固耦合的数值分析方法研究发展[J].力学季刊,2001,12(3):13-16.WANG Jian-jun,LI Qi-han.A review of numerical methods for fluid-structure interaction with large free surface sloshing[J].Chinese Quarterly Mechanics,2001,12(3):13-16.
[8]夏栋舟,何益斌,刘建华.刚性桩复合地基-上部结构动力相互作用体系抗震性能及影响因素分析[J].岩土力学,2009,30(11):3505-3511.XIA Dong-zhou,HE Yi-bin,LIU Jian-hua.Analysis of aseismic capability and influential factors for rigid pile composite foundation-superstructure dynamic interaction system[J].Rock and soil Mechanics,2009,30(11):3505-3511.
[9]夏栋舟,何益斌,刘建华.土-结构动力相互作用体系阻尼及地震反应分析[J].岩土力学,2009,30(10):2923-2928.XIA Dong-zhou,HE Yi-bin,LIU Jian-hua.Study of damping property and seismic action effect for soil-structure dynamic interaction system[J].Rock and Soil Mechanics,2009,30(11):3505-3511.
[10]Pressure Vessel Standards Technical Commission.SB7777-1Flat-bottomed,vertical,cylindrical storage tanks for low temperature service[S].London:British Standard Institute(BSI),1993,1-15.
[11]American Petroleum Institute.API standard 650 Welded steel tanks for oil storage[S].Washington:API Publishing Services,1998,107-115.
[12]王显利.工程结构抗震设计[M].北京:科学出版社,2008,36-69.
[13]中华人民共和国冶金工业部.GB50191-93构筑物抗震设计规范[S].北京:中国计划出版社,1994,23-35,124-127.
[14]王社良.抗震结构设计[M].武汉:武汉理工大学出版社2009,28-80.
[15]贾庆山.储罐基础工程手册[M].北京:中国石油出版社,2002,426-434.
[16]潘家华.圆柱形金属油罐设计[M].北京:烃加工出版社,1986,102-160.
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