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Research Papers: Design and Analysis

Stability of Open-Topped Storage Tanks With Top Stiffener and One Intermediate Stiffener Subject to Wind Loading

[+] Author and Article Information
Tianlong Sun

Lyles School of Civil Engineering,
Purdue University,
West Lafayette, IN 47907
e-mail: sun522@purdue.edu

Eyas Azzuni

Lyles School of Civil Engineering,
Purdue University,
West Lafayette, IN 47907
e-mail: eazzuni@purdue.edu

Sukru Guzey

Lyles School of Civil Engineering,
Purdue University,
West Lafayette, IN 47907
e-mail: guzey@purdue.edu

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 13, 2017; final manuscript received November 20, 2017; published online December 22, 2017. Assoc. Editor: Kiminobu Hojo.

J. Pressure Vessel Technol 140(1), 011204 (Dec 22, 2017) (14 pages) Paper No: PVT-17-1124; doi: 10.1115/1.4038723 History: Received July 13, 2017; Revised November 20, 2017

Aboveground vertical steel storage tanks use stiffener rings to prevent their shell wall from buckling under wind loading. The existing stiffener rings design rules from API 650 standard is known to be overly conservative. This study investigates the possibility of modifying the design rules by reducing the required size of the top stiffener ring to the same size as the intermediate stiffener ring. In this study, we used finite element analysis (FEA) to perform linear bifurcation analysis (LBA) and geometrically nonlinear analysis including imperfections (GNIA) to obtain failure load of modeled tanks. The buckling pressure load was obtained to ensure it is larger than the design pressure. Moreover, the effects of higher strength materials, different buckling modes, and various wind profiles were also studied to ensure the design suggested by this study is practical and universal to different situations. The results show that for cylindrical storage tanks, which only needs one intermediate stiffener ring, the size of the top stiffener ring can be set to the same size as the intermediate stiffener ring.

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Figures

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Fig. 1

Buckling of tank shell under wind loading with and without top stiffener

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Fig. 2

Wind profile expression by Rish [20]

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Fig. 3

Summary of different wind profiles

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Fig. 4

Cross section of the tank model

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Fig. 5

Mesh of the tank models, overall view (left), close-up to top stiffener (right)

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Fig. 6

Cross section of detail (c) in API 650 [31]

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Fig. 7

Cross section of detail (e) in API 650 [31]

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Fig. 8

GNIA results for reduced top stiffener ring design using ASTM A516 Grade 70

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Fig. 9

GNIA results for API top stiffener ring design using ASTM A516 Grade 70

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Fig. 10

Radial displacement (in) of typical LBA and GNIA buckling mode with 56-ft (17.1-m) height tanks

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Fig. 11

Summary of GNIA results for reduced top stiffener ring design and API 650 design

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Fig. 12

GNIA results for reduced top stiffener ring design using ASTM A841 Class 2

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Fig. 13

GNIA results for the first five independent buckling modes with 40-ft (12.2-m) height tanks using reduced top stiffener

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Fig. 14

GNIA results for blending the first three buckling modes with 40-ft (12.2-m) height tanks using reduced top stiffener

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Fig. 15

GNIA results for different wind profiles with 40-ft (12.2-m) height tanks using reduced top stiffener

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