位于不同场地的隔震储罐在地震作用下响应对比分析
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摘要
就橡胶垫隔震体系和摩擦摆隔震体系,研究分析大型立式储液罐在不同场地实际地震作用下的响应,同时将地震响应与非隔震储罐进行对比分析。分析结果表明:在柔软场地,摩擦摆隔震系统的减震效果要好于橡胶垫系统。摩擦摆支座控制隔震层位移的能力要好于橡胶垫支座。此外,进行了参数影响分析,来衡量储罐储液量、高径比和隔震系统的隔震周期对储罐主要响应的影响。储罐储液量较小时,摩擦摆支座的减震率要好于橡胶垫支座。隔震储罐高径比不宜取为0.8,此时脉冲位移和基底剪力的峰值响应都较大。隔震周期在2 s～3 s区间范围内时,可以取得最优减震效果。
The authors research and analyze the responses of large vertical liquid storage tanks located on different sites to the real earthquake ground motions,based on the lead-rubber bearing(LRB) and friction pendulum system(FPS).The seismic responses are compared with the corresponding responses of non-isolated tanks.It is found that,the FPS system is better than LRB in reducing the earthquake responses of tanks on soft site.FPS is found having higher ability of controlling the isolation displacement of tanks than the LRB.Moreover,a parametric study is conducted to evaluate the effect of tank storage level,aspect ratio and isolation period of the isolation system on key responses of the tanks.FPS is more effective in reducing the earthquake responses than LRB when the storage level is low.The aspect ratio of isolated tanks should not be taken as 0.8,in this case both impulsive displacement and base shear are great.Choosing the isolation period between 2 s～3 s,an optimal damping effect may be achieved.
The authors research and analyze the responses of large vertical liquid storage tanks located on different sites to the real earthquake ground motions,based on the lead-rubber bearing(LRB) and friction pendulum system(FPS).The seismic responses are compared with the corresponding responses of non-isolated tanks.It is found that,the FPS system is better than LRB in reducing the earthquake responses of tanks on soft site.FPS is found having higher ability of controlling the isolation displacement of tanks than the LRB.Moreover,a parametric study is conducted to evaluate the effect of tank storage level,aspect ratio and isolation period of the isolation system on key responses of the tanks.FPS is more effective in reducing the earthquake responses than LRB when the storage level is low.The aspect ratio of isolated tanks should not be taken as 0.8,in this case both impulsive displacement and base shear are great.Choosing the isolation period between 2 s～3 s,an optimal damping effect may be achieved.
引文
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[7]Simo J C,Kelly J M.The analysis of multi-layer elastomeric bearings[J].Journal of Applied Mechanics,1984,51(2):256-262.
[8]Okamura S,Fujita S.Motion analysis of pendulum type isolation systems during earthquakes[J].Journal of Pressure Vessel Technology,2007,129:507-515.
[9]Kim Y S,Yun C B.Seismic response characteristics ofbridges using double concave friction pendulum bearingswith tri-linear behavior[J].Engi-neering Structures,2007,29:3082-3093.
[10]王建强.基础隔震结构多维及平一扭耦联地震反应分析[D].西安:西安建筑科技大学,2003.WANG Jianqiang.Analysis on multi-dimensional and lateral-torsional coupled seismic response of base-isolated structures[D].Xi'an:Xian Uni-versity of Architecture and Technology,2003.(in Chinese)
[11]孙建刚.大型立式储罐隔震——理论、方法及实验[M].北京:科学技术出版社,2009:69-119.SUN Jiangang.Isolation of large vertical storage tank—Theory,Method,Test[M].Beijing:Science Press,2009:69-119.(in Chinese)
[12]崔利富.大型LNG储罐基础隔震与晃动控制研究[D].大连:大连海事大学,2012.CUI Lifu.Base isolation and sloshing control of large-scale LNG storage tanks[D].Dalian:Dalian Maritime University,2012.(in Chinese)
[2]Liang B,Tang J X.Vibration studies of base isolated storage tanks[J].Computers and Structures,1994,52:1051-1059.
[3]孙建刚,蒋峰,王向楠,等.刚性储罐基底隔震的动力反应[J].哈尔滨工程大学学报.2011,32(1):38-43.SUN Jiangang,JIANG Feng,WANG Xiangnan,et al.Dynamic responses resulting from the base isolation of rigid storage tanks[J].Journal of Har-bin Engineering University,2011,32(1):38-43.(in Chinese)
[4]Emre A,Eren U.Parametric analysis of liquid storage tanks base isolated by curved surface sliding bearings[J].Soil Dynamics and EarthquakeEngineering,2010,30:21-31.
[5]温丽,王曙光,杜东升,等.大型储液罐摩擦摆基底隔震控制分析[J].世界地震工程,2009,25(4):161-166.WEN Lin,WANG Shuguang,DU Dongsheng,etc.Controlling analysis of friction pendulum system for the seismic isolation of liquid storage tanks[J].World Earthquake Engineering,2009,25(4):161-166.(in Chinese)
[6]马良喆,陈永祁.摩擦摆隔震支座在储液罐隔震的应用[J].工业建筑,2009,39:494-498.MA Liangzhe,CHEN Yongqi.Application of froction pendulum bearing in liquid storage tanks[J].Industrial Construction,2009,39:494-498.(in Chinese)
[7]Simo J C,Kelly J M.The analysis of multi-layer elastomeric bearings[J].Journal of Applied Mechanics,1984,51(2):256-262.
[8]Okamura S,Fujita S.Motion analysis of pendulum type isolation systems during earthquakes[J].Journal of Pressure Vessel Technology,2007,129:507-515.
[9]Kim Y S,Yun C B.Seismic response characteristics ofbridges using double concave friction pendulum bearingswith tri-linear behavior[J].Engi-neering Structures,2007,29:3082-3093.
[10]王建强.基础隔震结构多维及平一扭耦联地震反应分析[D].西安:西安建筑科技大学,2003.WANG Jianqiang.Analysis on multi-dimensional and lateral-torsional coupled seismic response of base-isolated structures[D].Xi'an:Xian Uni-versity of Architecture and Technology,2003.(in Chinese)
[11]孙建刚.大型立式储罐隔震——理论、方法及实验[M].北京:科学技术出版社,2009:69-119.SUN Jiangang.Isolation of large vertical storage tank—Theory,Method,Test[M].Beijing:Science Press,2009:69-119.(in Chinese)
[12]崔利富.大型LNG储罐基础隔震与晃动控制研究[D].大连:大连海事大学,2012.CUI Lifu.Base isolation and sloshing control of large-scale LNG storage tanks[D].Dalian:Dalian Maritime University,2012.(in Chinese)
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