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Keywords: liquid storage tank, finite elements, modal analysis, finite element modelling, sloshing modes, ANSYS.

Summary

Model analysis of liquid storage vertical tanks is a challenging task due to complexity of the fluid-structure-soil interaction. Modal analysis of such tanks using finite element modeling programs has become a preferred technique for investigating the behavior of liquid storage tanks subjected to earthquake excitations. The finite element model is validated and tuned by comparing its results with experimental measurements as well as solutions from simplified theoretical models available in the literature for such tanks. However, most finite element studies in the literature do not provide enough details on the selection of the elements employed other than identifying them as shell, fluid, or beam elements and do not discuss or consider other elements, within the same types available in the library of the finite element computer programs utilized, that may yield better results. The objective of this study is to set up the optimal finite element options of parameters such as element types and number of elements which best predict the tank dynamic characteristics, natural frequencies and principal mode shapes. This is done by using the finite element analysis package, ANSYS, to carry out a modal analysis for investigating the dynamic characteristics of the above tanks. Coupled natural frequencies in sloshing modes were obtained for various tank height-to-diameter ratios, various tank wall thicknesses, and various liquid depths. The finite element predictions compared well with the literature available for experimental and numerical results. A set of finite element options of parameters is recommended for the elastic and inelastic analysis of the above tanks.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 108 PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping Paper 104 Towards Optimal Finite Element Modeling for the Analysis of Liquid Storage Tanks S.A. Elkholy^1,2, A.A. Elsayed², B. El-Ariss¹ and S.A. Sadek² ¹Civil and Environmental Engineering Department, United Arab Emirates University, United Arab Emirates ²Fayoum University, Cairo, Egypt doi:10.4203/ccp.108.104 purchase the full-text of this paper Full Bibliographic Reference for this paper S.A. Elkholy, A.A. Elsayed, B. El-Ariss, S.A. Sadek, "Towards Optimal Finite Element Modeling for the Analysis of Liquid Storage Tanks", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 104, 2015. doi:10.4203/ccp.108.104 Keywords: liquid storage tank, finite elements, modal analysis, finite element modelling, sloshing modes, ANSYS. Summary Model analysis of liquid storage vertical tanks is a challenging task due to complexity of the fluid-structure-soil interaction. Modal analysis of such tanks using finite element modeling programs has become a preferred technique for investigating the behavior of liquid storage tanks subjected to earthquake excitations. The finite element model is validated and tuned by comparing its results with experimental measurements as well as solutions from simplified theoretical models available in the literature for such tanks. However, most finite element studies in the literature do not provide enough details on the selection of the elements employed other than identifying them as shell, fluid, or beam elements and do not discuss or consider other elements, within the same types available in the library of the finite element computer programs utilized, that may yield better results. The objective of this study is to set up the optimal finite element options of parameters such as element types and number of elements which best predict the tank dynamic characteristics, natural frequencies and principal mode shapes. This is done by using the finite element analysis package, ANSYS, to carry out a modal analysis for investigating the dynamic characteristics of the above tanks. Coupled natural frequencies in sloshing modes were obtained for various tank height-to-diameter ratios, various tank wall thicknesses, and various liquid depths. The finite element predictions compared well with the literature available for experimental and numerical results. A set of finite element options of parameters is recommended for the elastic and inelastic analysis of the above tanks. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £75 +P&P)
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