Behaviour of structural stainless steel cross-sections under combined loading - Part II: Numerical modelling and design approach

Title: Behaviour of structural stainless steel cross-sections under combined loading - Part II: Numerical modelling and design approach
Authors: Zhao, O
Rossi, B
Gardner, L
Young, B
Item Type: Journal Article
Abstract: In parallel with the experimental study described in the companion paper (Zhao et al., submitted for publication), a numerical modelling programme has been carried out to investigate further the structural behaviour of stainless steel cross-sections under combined loading. The numerical models, which were developed using the finite element (FE) package ABAQUS, were initially validated against the experiments, showing the capability of the FE models to replicate the key test results, the full experimental load–deformation histories and the observed local buckling failure modes. Upon validation of the FE models, parametric studies were conducted to generate additional structural performance data over a wide range of cross-section slenderness and combinations of loading. The experimental and numerical results were then compared with the design capacity predictions from the current European Standard EN 1993-1-4 (2006) and American Specification SEI/ASCE-8 (2002) for stainless steel structures. The comparisons revealed that the current design standards can significantly under-estimate the resistance of stainless steel cross-sections subjected to combined loading; this under-prediction of capacity can be primarily attributed to the lack of consideration of strain hardening of the material under load. The Continuous Strength Method (CSM) is a deformation-based design approach that accounts for strain hardening and has been shown to provide accurate predictions of cross-sectional resistance under compression and bending, acting in isolation. In the present paper, proposals are made to extend the scope of the CSM to the case of combined loading. Comparisons between the CSM design proposals and the test and FE results indicated a high level of accuracy and consistency in the predictions. The reliability of the proposals was confirmed by means of statistical analyses according to EN 1990 (2002).
Issue Date: 4-Dec-2014
Date of Acceptance: 10-Nov-2014
ISSN: 1873-7323
Publisher: Elsevier
Start Page: 247
End Page: 259
Journal / Book Title: Engineering Structures
Volume: 89
Copyright Statement: © 2014 Elsevier. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Keywords: Science & Technology
Engineering, Civil
Continuous strength method
Design rules
Finite element analysis
Numerical modelling
Parametric studies
Reliability analysis
Stainless steel
Strain hardening
Structural design
Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering

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