外浮顶对大型立式储液罐地震反应影响分析
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摘要
为了减轻大型外浮顶立式储液罐在地震灾害中的损失,基于ANSYS软件建立了考虑液体晃动和罐底提离的大型外浮顶立式圆柱形储液罐有限元模型,计算了地震作用下不同形式浮顶(平浮顶、正锥形,倒锥形)的大型外浮顶储油罐的动力响应.数值分析结果表明,地震荷载作用下,外浮顶对大型立式储液罐地震反应影响不可忽视,浮顶可以减轻液面晃动,但也会增加液体提离高度.不同形式的外浮顶对大型立式储液罐地震反应影响程度不同,平浮顶为最优浮顶形式.
In order to reduce the loss of the large elevated liquid-storage tank with outside floating roof in earthquake,this paper analyses the dynamic response of large elevated liquid-storage tank with different forms of outside floating roofs(plate form,positive cone form,and reverse cone form) by building a finite element model with ANSYS,which is involved in fluid sloshing and tank bottom uplift.The numerical results show that the effect of outside floating roof on the seismic response of large elevated liquid-storage tank cannot be negligible,the roof can reduce the shock of the liquid,but it can also increase the height of the uplift of the bottom of the tank.The effect of different forms of outside floating roof on seismic response of elevated liquid-storage tank is different,and plate form is the optimal one.
In order to reduce the loss of the large elevated liquid-storage tank with outside floating roof in earthquake,this paper analyses the dynamic response of large elevated liquid-storage tank with different forms of outside floating roofs(plate form,positive cone form,and reverse cone form) by building a finite element model with ANSYS,which is involved in fluid sloshing and tank bottom uplift.The numerical results show that the effect of outside floating roof on the seismic response of large elevated liquid-storage tank cannot be negligible,the roof can reduce the shock of the liquid,but it can also increase the height of the uplift of the bottom of the tank.The effect of different forms of outside floating roof on seismic response of elevated liquid-storage tank is different,and plate form is the optimal one.
引文
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[2]HAMDAN F H.Seismic behavior of cylindrical steelliquid storage tank[J].Journal of Construction SteelResearch,2000,553(12):307-333.
[3]AGHAJARI S,ABEDI K,SHOWKATI H.Bucklingand post-buckling behavior of thin-walled cylindri-cal steel shells with varying thickness subjected to uni-form external pressure[J].Thin-Walled Structures,2006,44(8):904-909.
[4]CHO J R,SONG J M,LEE J K.Finite element tech-niques for the free-vibration and seismic analysis ofliquid-storage tank[J].Finite Elements in Analysisand Design,2001,37(6-7):467-483.
[5]MALHOTRA P K,VELETSOS A S.Uplifting re-sponse of unanchored liquid-storage tanks[J].Journal of Structural Engineering,1994,120(12):3525-3546.
[6]MALHOTRA P K.Base uplifting analysis of flexiblysupported liquid-storage tanks[J].Earthquake En-gineering and Structural Dynamics,1995,24(12):1591-1607.
[7]PASLEY H,CLARK C.Computational fluid dynamicsstudy of flow around floating-roof oil storage tanks[J].Journal of Wind Engineering and Industrial Aer-odynamics,2000,86(1):37-54.
[8]DAKHEL A A,RAHIMI M.CDF simulation of hom-ogenization in large-scale crude oil storage tanks[J].Journal of Petroleum Science and Engineering,2004,43(3-4):151-161.
[9]戴鸿哲,王伟,穆海燕,等.大型外浮顶立式储液罐被动控制方法[J].哈尔滨工业大学学报,2008,40(10):1537-1541.
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