Research Papers: Fluid-Structure Interaction

Seismic Design of a Double Deck Floating Roof Type Used for Liquid Storage Tanks

[+] Author and Article Information
Mohammad Ali Goudarzi

Assistant Professor
Structural Engineering Research Center,
International Institute of Earthquake Engineering and Seismology (IIEES),
Tehran 11369, Iran
e-mail: m.a.goodarzi@iiees.ac.ir

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 27, 2014; final manuscript received November 12, 2014; published online February 23, 2015. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 137(4), 041302 (Aug 01, 2015) (7 pages) Paper No: PVT-14-1071; doi: 10.1115/1.4029111 History: Received April 27, 2014; Revised November 12, 2014; Online February 23, 2015

Sloshing response of a cylindrical liquid storage tank with the double deck type floating roof (DDFR) subjected to seismic excitation is considered in this paper. The aim of the paper is to clarify the significant parameters that should be considered in the seismic design of a DDFR and proposing a practical seismic design procedure for evaluating the dynamic stresses inside a DDFR. A numerical method including fluid–structure interaction and the geometry details of a DDFR tank are established. The geometric nonlinear effects on the seismic behavior of the DDFR as well as the accuracy of common analytical solution suggested in the literature are examined by the numerical model. The numerical results show that the geometric nonlinear effects can considerably reduce the seismic stress in DDFR, but have no significant effect on the liquid hydrodynamic pressure exerted on the DDFR and the roof's vertical displacement. It is also revealed that not only the general displacement of DDFR but also the local effects of liquid hydrodynamic pressure on the bottom plate should be considered for seismic design of a DDFR. Finally, a design procedure for the evaluation of dynamic stress in the DDFR due to the seismic loads is proposed and discussed.

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Fig. 1

Schematic plan view and Finite element mesh distribution inside the considered DDFR

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Fig. 2

Dimensions and geometry of the DDFR used in the numerical model

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Fig. 3

Comparison between FEM results and experimental measurements for sloshing wave height under seismic loads

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Fig. 4

The time history of numerical results for hydrodynamic pressure and liquid sloshing

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Fig. 5

Maximum value of the analytical and numerical results for hydrodynamic pressure and liquid sloshing height

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Fig. 6

Maximum value of the numerical results for Von-Mises seismic stresses in the top and bottom plates

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Fig. 7

Dividing the lower plate of a DDFR with several subdomains which are approximated by rectangular shapes

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Fig. 8

Comparison of the numerical results and simplified relation for evaluating seismic stresses




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