Research Papers: Design and Analysis

Buckling of Cylindrical Steel Tanks With Oblique Body Imperfection Under Uniform External Pressure

[+] Author and Article Information
Mehdi Rastgar

Department of Civil Engineering,
Urmia University,
Urmia 5756151818, Iran
e-mail: m.rastgar@urmia.ac.ir

Hossein Showkati

Department of Civil Engineering,
Urmia University,
Urmia 5756151818, Iran
e-mail: h.showkati@urmia.ac.ir

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 16, 2017; final manuscript received August 27, 2017; published online September 18, 2017. Editor: Young W. Kwon.

J. Pressure Vessel Technol 139(6), 061203 (Sep 18, 2017) (11 pages) Paper No: PVT-17-1053; doi: 10.1115/1.4037808 History: Received March 16, 2017; Revised August 27, 2017

Shell structures are built using a number of welded curved panel parts. Hence, some geometrical imperfections emerge. These imperfections have a direct impact on structural behavior of shells during the external compressive loading. In this research, a field study was accomplished on the implementation of the storage tanks in a refinery site, and then the resulted imperfections were identified and categorized. The survey of imperfections revealed that imperfection resulted from deviation with respect to the vertical direction has the highest number in tank bodies. This imperfection experimentally modeled, and the buckling behavior of these tanks was evaluated under uniform external pressure. The cylindrical tanks were examined using finite element analysis, and results obtained were compared with experimental results. Investigation of finding results demonstrated that such imperfection has a significant role in reducing the number of circumferential waves in body of the tanks under uniform external pressure. Comparing the results obtained by estimation, American Society of Mechanical Engineers (ASME) code, experimental research, and finite element method (FEM) represented a considerable difference in the amount of buckling load. Results show that tanks with oblique body imperfections exhibit high initial strength against buckling due to the uniform external pressure.

Copyright © 2017 by ASME
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Fig. 1

Load–axial displacement graph of columns, flat plates, and cylindrical shells in perfect and imperfect states [9]

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Fig. 3

Circumferential sheets installation process in the body of tank and generation of different imperfections

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Fig. 4

Types of observed imperfections in the field study of tanks

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Fig. 5

Frequency distribution graph of the imperfection types in all tanks

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Fig. 6

Imperfection type (f) (oblique body imperfection)

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Fig. 7

Experimental specimens

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Fig. 8

Measurement of intentional imperfection value

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Fig. 9

(a) The three samples, (b) tensile test, and (c) stress–strain diagram of material

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Fig. 10

A view of the laboratory equipment's and experimental specimen

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Fig. 11

Installation of measurement devices on the experimental specimen

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Fig. 12

Schematic view of all installed sensors with location of imperfection and failure

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Fig. 13

(a) Full buckling of Spec1 and instability threshold and (b) failure of the Spec1

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Fig. 14

(a) Full buckling of Spec2 and instability threshold and (b) failure of the Spec2

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Fig. 15

(a) Full buckling of Spec3 and instability threshold and (b) failure of the Spec3

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Fig. 16

Circumferential strain diagram of three specimen tanks at the failure location

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Fig. 17

Radial displacement of the tanks' body at the unstable location

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Fig. 18

Finite element models of three specimens in ANSYS software

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Fig. 19

Full buckling of the finite element method (FEM) models and created deformations in the nonlinear state

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Fig. 20

Load–deformation graph of the FEM models for all specimens at the unstable point

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Fig. 21

Comparison of experiment, FEM, theory, and ASME results for buckling behavior of all specimens




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