地震作用下立式储液罐罐壁“象足”变形仿真分析
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摘要
基于ANSYS软件建立了考虑液体晃动和罐底提离立式储液罐有限元模型,分别进行了水平地震和竖向地震作用下罐壁“象足”变形分析。分析表明:立式储液罐罐壁“象足”变形主要是由罐壁纵向压应力超过临界应力而产生的局部屈曲破坏,并非强度破坏。因罐底提离导致的罐底与基础反复撞击加大了作用在罐壁上的应力,使罐壁底部“象足”变形不断发展,最终导致罐壁撕裂。在完全相同地震加速度作用下,水平地震作用比竖向地震作用罐壁更早更容易进入屈曲状态,产生“象足”变形。
The elephant foot bulging deformation of rigid walls of liquid-storage tanks under horizontal and vertical seismic ground motions is analyzed by using the finite element model involving fluid sloshing and tank bottom uplift with ANSYS.The numerical results show that the elephant foot bulging is in fact buckling failure which is caused by the overcritical compressive stress rather than intensity failure.The elephant foot bulging deformation develops with the increasing stress of the rigid wall,which is caused by the uplift of the tank bottom and the impaction between the tank bottom and the foundation. It is also shown that the buckling failure of the rigid wall arises easier from the horizontal seismic ground motion than from the vertical one,therefore the elephant foot bulging deformation is also easier produced.
The elephant foot bulging deformation of rigid walls of liquid-storage tanks under horizontal and vertical seismic ground motions is analyzed by using the finite element model involving fluid sloshing and tank bottom uplift with ANSYS.The numerical results show that the elephant foot bulging is in fact buckling failure which is caused by the overcritical compressive stress rather than intensity failure.The elephant foot bulging deformation develops with the increasing stress of the rigid wall,which is caused by the uplift of the tank bottom and the impaction between the tank bottom and the foundation. It is also shown that the buckling failure of the rigid wall arises easier from the horizontal seismic ground motion than from the vertical one,therefore the elephant foot bulging deformation is also easier produced.
引文
[1]唐友刚,董艳秋,项中权,等.储液罐液-固-土耦合非线性翘离振动分析[J].地震工程与工程振动,1997,3(24):102-109.
[2]温德超,郑兆昌,孙焕纯.储液罐地震提离的多种非线性耦合的多种移动边界问题[C].第五界全国地震工程学术会议论文.北京,1998.
[3]Hamdan F H.Seismic behavior of cylindrical steel liquid storage tanks[J].Journal of Constructional steel research,2000,553(12):307-333.
[4]Ansys User’s Manual:Element,[M].3rd ed,Swanson Analysis Systems,Inc.2000.
[5]Ansys User’s Manual:Procedures[M].1st ed,Swanson Analysis Systems,Inc.2000.
[6]Ray W C.Experimental Seismic Study of Cylindrical Tanks[J].Journal of the Structure Division,ASCE.1979,105(12):1356-1361.
[7]API-650:Welded steel tanks for oil storage,American Polymers,Inc,1998.
[8]Schneider P,Bucher F,Zapeca F.Structural response to thin steel shell structures due to aircraft impact[J].Journal of Loss Prevention in theProcess Industries,1999,12(7):325-329.
[9]Ralf.Analysis of unanchored liquid storage tanks under lateral loads peek[J].Earthquake Engineering&Structural Dynamics,1988,16(7):1087-1100.
[10]Reekop D,Mirfakhraei.Bucking of circular cylindrical shells by the differential quadrature method[J].P.International Journal of Preesure Ves-sels and Piping,1998,15(75):347-353.
[11]Ficher F D,Rammerstorfer F G.A refined analysis of sloshing effects in seismically excited tanks[J].International Journal of Pressure Vesselsand Piping,1999,31(76):693-709.
[12]Praveen K,Malhotra.Base uplifting analysis of flexibly supported liquid-storage tanks[J].Earthquake Engineering&Structural Dynamics,1995,24(12):1591-1607.
[13]CPal N.Bhattacharyya S K,Somha P K.Coupled slosh dynamics of liquid-filled composite cylindrical tanks[J].Journal of Engineering Me-chanics,1999,4(455):549-553.
[14]孟振虎,高锡祺.圆柱形储液罐垂直地面运动分析[J].江苏石油化工学院学报,1995,7(14):45-51.
[2]温德超,郑兆昌,孙焕纯.储液罐地震提离的多种非线性耦合的多种移动边界问题[C].第五界全国地震工程学术会议论文.北京,1998.
[3]Hamdan F H.Seismic behavior of cylindrical steel liquid storage tanks[J].Journal of Constructional steel research,2000,553(12):307-333.
[4]Ansys User’s Manual:Element,[M].3rd ed,Swanson Analysis Systems,Inc.2000.
[5]Ansys User’s Manual:Procedures[M].1st ed,Swanson Analysis Systems,Inc.2000.
[6]Ray W C.Experimental Seismic Study of Cylindrical Tanks[J].Journal of the Structure Division,ASCE.1979,105(12):1356-1361.
[7]API-650:Welded steel tanks for oil storage,American Polymers,Inc,1998.
[8]Schneider P,Bucher F,Zapeca F.Structural response to thin steel shell structures due to aircraft impact[J].Journal of Loss Prevention in theProcess Industries,1999,12(7):325-329.
[9]Ralf.Analysis of unanchored liquid storage tanks under lateral loads peek[J].Earthquake Engineering&Structural Dynamics,1988,16(7):1087-1100.
[10]Reekop D,Mirfakhraei.Bucking of circular cylindrical shells by the differential quadrature method[J].P.International Journal of Preesure Ves-sels and Piping,1998,15(75):347-353.
[11]Ficher F D,Rammerstorfer F G.A refined analysis of sloshing effects in seismically excited tanks[J].International Journal of Pressure Vesselsand Piping,1999,31(76):693-709.
[12]Praveen K,Malhotra.Base uplifting analysis of flexibly supported liquid-storage tanks[J].Earthquake Engineering&Structural Dynamics,1995,24(12):1591-1607.
[13]CPal N.Bhattacharyya S K,Somha P K.Coupled slosh dynamics of liquid-filled composite cylindrical tanks[J].Journal of Engineering Me-chanics,1999,4(455):549-553.
[14]孟振虎,高锡祺.圆柱形储液罐垂直地面运动分析[J].江苏石油化工学院学报,1995,7(14):45-51.
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