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Safety and Reliability

Plastic Collapse Loads of Cracked Square Hollow Section T-, Y-, and K-joints

[+] Author and Article Information
S. T. Lie

School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singaporecstlie@ntu.edu.sg

Z. M. Yang

 Det Norske Veritas Pte. Ltd., 10 Science Park Drive, DNV Technology Centre, Singapore 118224, Singaporezhengmao.yang@dnv.com

J. Offshore Mech. Arct. Eng 133(2), 021601 (Dec 06, 2010) (10 pages) doi:10.1115/1.4001960 History: Received March 04, 2009; Revised January 23, 2010; Published December 06, 2010; Online December 06, 2010

This paper concerns on the development of numerical models for cracked square hollow sections (SHSs) T-, Y-, and K-joints. Based on these numerical models, the plastic collapse loads Pc are calculated using nonlinear finite element method and through twice-elastic compliance criterion. It is found that the numerical plastic collapse loads Pc are slightly conservative compared with the ones calculated using formulae proposed by BS7910 [British Standards, 2005, “Guide on Methods for Assessing the Acceptability of Flaws in Metallic Structures,” BS 7910-Amendment 1] and are in close agreement with the experimental tests data. Therefore, the proposed numerical model is robust and it can be used to calculate the plastic collapse loads Pc of the cracked (SHS) T-, Y-, and K-joints.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 4

Close-up view cross-section showing double curvature of the crack

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Figure 5

Crack front extension

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Figure 6

Crack curvature under weld toe on a smooth curved crack surface

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Figure 7

Crack dimensions and details under the weld toe

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Figure 8

Mapping from 2D to 3D crack front

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Figure 9

Elements around the crack front

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Figure 10

The mesh around the crack front

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Figure 11

The mesh of the crack zone

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Figure 12

The generated mesh of a cracked SHS T-joint

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Figure 13

The generated mesh of a cracked SHS Y-joint

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Figure 14

The completed K-joint mesh

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Figure 15

Crack tip elements for elastic and elastic-plastic analysis

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Figure 16

Original mesh of SHS T-joint

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Figure 17

Comparison of SIFs calculated using different mesh schemes

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Figure 18

Load-displacement curves calculated using different meshes

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Figure 19

Concept of twice-elastic compliance criterion

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Figure 20

Actual stress-strain curve of the BS4360-50D (25) structural steel

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Figure 21

Loading and boundary conditions for T-joint

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Figure 22

Loading and boundary conditions for Y- and K-joints

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Figure 23

Load-displacement curves for series T1-joints

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Figure 24

Load-displacement curves for series Y1-joints

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Figure 25

Load-displacement curves for series K1-joints

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Figure 26

Load-displacement curve of specimen T2-joint

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Figure 27

Load-displacement curve of specimen Y2-joint

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Figure 28

Load-displacement curve of specimen K2-joint

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Figure 2

Dimensional notations used by CIDECT (13) and IIW (14)

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Figure 3

A typical surface crack at the corner and under the weld toe

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Figure 1

Level 2A/3A failure assessment curve

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