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Research Papers: Structures and Safety Reliability

Influence of Model Geometry and Boundary Conditions on the Ultimate Strength of Stiffened Panels Under Uniaxial Compressive Loading

[+] Author and Article Information
Ming Cai Xu, C. Guedes Soares

Centre for Marine Technology
and Engineering (CENTEC),
Instituto Superior Técnico,
Technical University of Lisbon,
Lisbon 1049-001, Portugal

Masahiko Fujikubo

Department of Naval Architecture
and Ocean Engineering,
Graduate School of Engineering,
Osaka University,
Osaka 1111, Japan

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 20, 2012; final manuscript received May 17, 2013; published online September 4, 2013. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 135(4), 041603 (Sep 04, 2013) (10 pages) Paper No: OMAE-12-1049; doi: 10.1115/1.4024710 History: Received May 20, 2012; Revised May 17, 2013

The aim of this paper is to determine an appropriate configuration of the boundary conditions and geometric model to calculate the ultimate strength of a continuous stiffened panel under compressive loading in the finite element (FE) analysis. The 1 + 1 spans model with periodical symmetric boundary conditions is proposed to be used in the FE analysis, whose results are compared with the 1/2 + 1 + 1/2 span model with periodical symmetric and symmetric boundary condition, and the 1/2 + 1 + 1 + 1/2 span model with symmetric boundary conditions. The effects of the continuity of the stiffened panel with different geometric models and boundary conditions on its collapse mode are investigated. A beam tension test has been used to define the true stress-strain relationship in the FE analysis. The two-span model, either 1 + 1 or 1/2 + 1 + 1/2, with periodical symmetric conditions give a reasonable FE modeling, which can consider both odd and even number half waves and, thus, have the smallest model uncertainty.

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Figures

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Fig. 1

Analysis range and coordinate system of the stiffened panels. (a) Mode A: 1/2 + 1 + 1/2 spans, (b) Model B: 1 + 1 spans, and (c) Model C: 1/2 + 1 + 1 + 1/2 spans.

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Fig. 2

Engineering and true stress-strain curves of the material

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Fig. 3

FE models of the stiffened panels. (a) Mode A: 1/2 + 1 + 1/2 spans, (b) Model B: 1 + 1 spans, and (c) Model C: 1/2 + 1 + 1 + 1/2 spans.

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Fig. 4

Initial imperfection shapes of the stiffened panel for Model A. (a) Local plate panel, (b) Column-type of stiffeners, and (c) Side-ways of stiffeners.

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Fig. 5

Failure mode and equivalent stress distributions of the stiffened panels at ultimate strength under longitudinal thrust (L = 300 mm, tp = 4 mm). (a) Case 1, (b) Case 2, (c) Case 3, and (d) Case 4.

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Fig. 6

Ultimate strength of the stiffened panels under longitudinal thrust (tp = 4 mm)

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Fig. 7

Load-displacement curves of the stiffened panels under pure longitudinal thrust (tp = 4 mm). (a) L = 300 mm, (b) L = 450 mm, (c) L = 600 mm.

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Fig. 8

Equivalent stress distributions of the stiffened panels after collapse under pure longitudinal thrust (L = 300 mm, tp = 4 mm). (a) Case 1, (b) Case 2, (c) Case 3, and (d) Case 4.

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Fig. 11

Ultimate strength of the stiffened panels under combined longitudinal thrust and lateral pressure (L = 450 mm, tp = 4 mm). (a) Lateral pressure: 0.2 MPa and (b) Lateral pressure: 0.4 MPa.

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Fig. 12

Failure mode and equivalent stress distributions of the stiffened panels at the ultimate strength under the combined load (FS45B2, L = 450 mm, lateral pressure = 0.4 MPa). (a) Case 1, (b) Case 2, (c) Case 3, and (d) Case 4.

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Fig. 13

Ultimate strength of the stiffened panels with different lateral pressure (L = 450 mm, Case 2)

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Fig. 14

Collapse modes of the stiffened panels at the ultimate strength with different lateral pressures for FS45B2 (L = 450 mm, Case 2). (a) Lateral pressure = 0, (b) Lateral pressure = 0.1 MPa, (c) Lateral pressure = 0.2 MPa, (d) Lateral pressure = 0.3 MPa, and (e) Lateral pressure = 0.4 MPa.

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Fig. 10

Load-displacement curves of the stiffened panels under combined longitudinal thrust and lateral pressure (L = 450 mm, tp = 4 mm). (a) Lateral pressure: 0.2 MPa and (b) Lateral pressure: 0.4 MPa.

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Fig. 9

Relationships between the ultimate strength and plate panel slenderness of the stiffened panels under pure longitudinal thrust. (a) L = 300 mm, (b) L = 450 mm, and (c) L = 600 mm.

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