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Research Papers

Ultimate Strength and Ductility Characteristics of Intermittently Welded Stiffened Plates Under In-Plane Axial Compression

[+] Author and Article Information
Mohammad Reza Khedmati

Faculty of Marine Technology, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15914, Irankhedmati@cic.aut.ac.ir

Mehran Rastani

 Statoil-Petropars JV, No. 255 Mirdamad Boulevard, Postal Code 1918933931, Tehran, Iranrastani@sp68.com

J. Offshore Mech. Arct. Eng 130(1), 011002 (Dec 04, 2007) (8 pages) doi:10.1115/1.2783885 History: Received November 13, 2006; Revised April 29, 2007; Published December 04, 2007

The ultimate strength and ductility characteristics of the intermittently welded stiffened plates under the action of in-plane axial compression are investigated in this paper. A series of detailed numerical analyses of longitudinally stiffened steel plates subjected to in-plane compressive load is performed using the ADINA commercial finite element code. Complete equilibrium paths are traced up to collapse for a nonlinear elastic-plastic response of stiffened plates. Analyzed stiffened plates are imperfect and their aspect ratio, plate slenderness, and column slenderness are changed in a systematic manner. Different types of stiffener are chosen for stiffened plate models. Three different stiffener-to-plate welding procedures are considered: continuous, chain intermittent, and staggered intermittent fillet welding.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Collapse of serrated stiffened plate (11)

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Figure 2

Continuous welding of attaching the stiffeners to the plate

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Figure 3

Intermittent welding of attaching the stiffeners to the plate

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Figure 4

Typical stiffened plate and the extent of the FEM

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Figure 5

Eight-nodded isoparametric quadrilateral element for thick and thin shells

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Figure 6

Example of integration point labeling for rectangular shell element

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Figure 7

Rigid elements at the plate-to-stiffener junction

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Figure 8

Typical FEM with the mesh divisions

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Figure 9

Average stress–average strain relationship of the models EX1C, EX1S, and EX1P

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Figure 10

Effect of b∕t on the ultimate strength of the stiffened plates with various types of welding

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Figure 11

Effect of a∕b on the ultimate strength of the stiffened plates with various types of welding

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Figure 12

Differences in the ultimate strength of the stiffened plates with various types of welding as a function of λ

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Figure 13

Differences in the ultimate strength of the stiffened plates with various types of welding as a function of b∕t

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Figure 14

Comparison of all numerical results with strength curves proposed by PRS rules

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Figure 15

Longitudinal ductility of stiffened plates with λ≈0.3 against the plate slenderness b∕t

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Figure 16

Longitudinal ductility of stiffened plates with b∕t=42–62.5 against the column slenderness λ

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