Ali İhsan ÇELİK, Mehmet Metin KÖSE, Tahir AKGÜL, Ahmet Celal ALPAY

DIRECTIONAL-DEFORMATION ANALYSIS OF CYLINDRICAL STEEL WATER TANKS SUBJECTED TO EL-CENTRO EARTHQUAKE LOADING

Cylindrical steel storage tanks are widely used for the storage of various liquids, industrial chemicals and firefighting waters. They have been used for cooling purposes in nuclear power plants in recent years. Liquid-storage tanks have many different configurations; however, in this study, cylindrical ground-supported liquid steel tanks were preferred due to their simplicity design and performance of resistances against seismic loads, when compared with other configurations. Earthquakes are a natural occurrence and are unpredictable and complex; thus, the steel storage liquid tanks are expected to withstand earthquake-related loads. These tanks may be exposed to some damages such as elephant-foot buckling, diamond-shape buckling, overturning and uplifting during earthquakes. They can also cause great financial and environmental damage with their hazardous chemical contents. Dimensions of cylindrical open-top, flat-closed and torispherical-closed-top tanks were determined for 3D-finite element method (FEM) models in an ANSYS workbench software. This article focuses on the seismic-activity-resistant ground-supported cylindrical (vertical) steel storage liquid tanks. Seismic analyses were conducted under El-Centro earthquake loads. Directional deformation, equivalent stress and acceleration results were presented for both impulsive and convective regions. In this study, directional deformations of the tanks with the same diameter and three different roofs (open-top, flat-closed and torispherical-closed) were compared after the seismic analysis. The results show that if the cylindrical steel water tank roof is closed in a torispherical dome shaped, the directional deformation will decrease. Hence, torispherial roof shape of tank is recommended.

Keywords:

Cylindrical storage tank, API 650, FEM analysis, seismic analysis.,

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[1] Bayraktar A, Sevim B, Altunışık A C, ( 2010) Türker T. Effect of the model updating on the earthquake behavior of steel storage tanks. J Constr Steel Res, 66: 462–468.
[2] Houser, G. W.,( 1954) Earthquake Pressures on Fluid Containers, Eighth Technical Report under Office of Naval Research, Project Designation No. 081 - 095, California Institute of Technology, Pasadena, California, pp. 02-16.
[3] Housner G W., ( 1957) Dynamic pressures on accelerated fluid containers. Bull Seismol Soc Am, 47(1): 15–35.
[4] Housner G W., (1963) The Dynamic Behavior of Water Tanks. Bull Seismol Soc Am, 53(2): 381–387 [5] Malhotra P K, Wenk T, Wieland M., (2000) Simple Procedure for Seismic Analysis of Liquid-Storage Tanks. Struct Eng Int, 10(3): 197–201.
[6] Sunitha K R, Jacob B., (2015) Dynamic Buckling of Steel Water Tank Under Seismic Loading. International Journal of Civil Engineering (IJCE), 4(6): 81–89.
[7] Mohamadshahi M, Afrous A., (2015) General considerations in the seismic analysis of steel storage tanks. Journal of Scientific Research and Development, 2(6): 151–156.
[8] Brebbia C A, Popov V, Popov V., (2011) Thirty-third international conference on Boundary Elements and Other Mesh Reduction Methods XXXIII. Southamption: Wit Press, 286, web link: https://books.google.com.tr/books?id=bOwoKUfWONIC&printsec=frontcover&hl=tr#v=onepage&q&f=false.
[9] Naghdali H, Hamid K, Masoud G, Ehsan A, Navid K., (2013) Comparison of API650-2008 provisions with FEM analyses for seismic assessment of existing steel oil storage tanks. J Loss Prevent Proc Ind; 26(4).
[10] J.M. Spritzer, S. Guzey, (2017) Review of API 650 Annex E: Design of large steel welded aboveground storage tanks excited by seismic loads, Thin-Walled Structures 112, 41–65.
[11] S. Nicolici, R.M. Bilegan, (2013) Fluid structure interaction modeling of liquid sloshing phenomena in flexible tanks, Nucl. Eng. Des. 258, 51–56.
[12] Mahmoud R. Maheri, M.E. Karbaschi, M. Mahzoon, (2016) Analytical evaluation of dynamic characteristics of unanchored circular ground-based steel tanks”, Thin-Walled Structure. 109 (1) 251–259.
[13] M. Ormeno, T. Larkin, N. Chouw, (2015) The effect of seismic uplift on the shell stresses of liquid-storage tanks, Earthq. Eng. Struct. D 44 (12) 1979–1996.
[14] Spritzer J M, Guzey S. (2017) Nonlinear numerical evaluation of large open-top aboveground steel welded liquid storage tanks excited by seismic loads. Thin-Walled Structure, 119: 662–676.
[15] American Petroleum Institute (API) Standard, 650, (2013) Welded steel tanks for oil storage, 12th Ed., American Petroleum Institute.
[16] Özdemir Z.(2010) Interaction Fluide Structure et Analyse sismique pour les déformations non linéaires de réservoirs. These pour obtenir le grade de, Université des Sciences et Technologies de Lille Laboratoire de Mécanique de Lille (UMR CNRS 8107).
[17] Jacobsen L S., (1949) Impulsive hydrodynamics of fluid inside a cylindrical tank and of fluid surrounding a cylindrical pier. Bull Seismol Soc Am, 39(3): 189–204.
[18] Kuan, Siew Yeng. Design, Construction and Operation of the Floating Roof Tank. Course ENG 4111 and ENG 4112 Research Project, University of Southern Queensland Faculty of Engineering and Surveying.
[19] Bedri R, Al-Nais M O., (2005) Pre-stressed Modal Analysis Using Finite Element. Package ANSYS’ Lecture Notes in Computer Science, 3401.