Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design

This paper reports an experimental and numerical investigation into the cross-section behaviour and resistances of press-braked stainless steel channel sections under combined compression and major-axis bending moment. A testing programme was firstly conducted, including initial local geometric impe...

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Main Authors: Zhang, Lulu, Zhong, Yukai, Zhao, Ou
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/159757
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1597572022-07-01T06:32:52Z Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design Zhang, Lulu Zhong, Yukai Zhao, Ou School of Civil and Environmental Engineering Engineering::Civil engineering Continuous Strength Method Eccentrically Loaded Stub Column Tests This paper reports an experimental and numerical investigation into the cross-section behaviour and resistances of press-braked stainless steel channel sections under combined compression and major-axis bending moment. A testing programme was firstly conducted, including initial local geometric imperfection measurements and major-axis eccentric compression tests on ten press-braked stainless steel channel section stub column specimens. Following the testing programme, a numerical modelling programme was performed, where finite element models were developed and validated against the test results and then adopted to perform parametric studies to generate further numerical data over a wide range of cross-section dimensions and initial loading eccentricities. Based on the obtained test and numerical data, the existing design interaction curves, as given in the European code, American specification and Australian/New Zealand standard, were assessed and shown to result in conservative cross-section resistance predictions for press-braked stainless steel channel sections under major-axis combined loading. The conservatism of the codified design interaction curves stems from the conservative end points (i.e. cross-section resistances under pure compression and pure bending), which are determined without considering the effect of material strain hardening, and the inefficient linear shape, which ignores the effect of stress redistribution. Improved design interaction curves were proposed through the adoption of (i) more accurate end points, which are calculated with a rational exploitation of material strain hardening by continuous strength method and (ii) more efficient nonlinear shape, which allows for the stress redistribution. The proposed design interaction curves were shown to result in substantially more accurate resistance predictions for press-braked stainless steel channel sections under major-axis combined loading than their codified counterparts. The reliability of the proposed design interaction curves was confirmed by means of statistical analyses. Nanyang Technological University The authors thank Outokumpu Oyj and Stalatube for sponsoring grade EN 1.4420 stainless steel sheets and manufacturing press-braked channel sections. The NTU Research Scholarship is also acknowledged. 2022-07-01T06:32:52Z 2022-07-01T06:32:52Z 2021 Journal Article Zhang, L., Zhong, Y. & Zhao, O. (2021). Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design. Journal of Constructional Steel Research, 187, 106932-. https://dx.doi.org/10.1016/j.jcsr.2021.106932 0143-974X https://hdl.handle.net/10356/159757 10.1016/j.jcsr.2021.106932 2-s2.0-85114385113 187 106932 en Journal of Constructional Steel Research © 2021 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Continuous Strength Method
Eccentrically Loaded Stub Column Tests
spellingShingle Engineering::Civil engineering
Continuous Strength Method
Eccentrically Loaded Stub Column Tests
Zhang, Lulu
Zhong, Yukai
Zhao, Ou
Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
description This paper reports an experimental and numerical investigation into the cross-section behaviour and resistances of press-braked stainless steel channel sections under combined compression and major-axis bending moment. A testing programme was firstly conducted, including initial local geometric imperfection measurements and major-axis eccentric compression tests on ten press-braked stainless steel channel section stub column specimens. Following the testing programme, a numerical modelling programme was performed, where finite element models were developed and validated against the test results and then adopted to perform parametric studies to generate further numerical data over a wide range of cross-section dimensions and initial loading eccentricities. Based on the obtained test and numerical data, the existing design interaction curves, as given in the European code, American specification and Australian/New Zealand standard, were assessed and shown to result in conservative cross-section resistance predictions for press-braked stainless steel channel sections under major-axis combined loading. The conservatism of the codified design interaction curves stems from the conservative end points (i.e. cross-section resistances under pure compression and pure bending), which are determined without considering the effect of material strain hardening, and the inefficient linear shape, which ignores the effect of stress redistribution. Improved design interaction curves were proposed through the adoption of (i) more accurate end points, which are calculated with a rational exploitation of material strain hardening by continuous strength method and (ii) more efficient nonlinear shape, which allows for the stress redistribution. The proposed design interaction curves were shown to result in substantially more accurate resistance predictions for press-braked stainless steel channel sections under major-axis combined loading than their codified counterparts. The reliability of the proposed design interaction curves was confirmed by means of statistical analyses.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Zhang, Lulu
Zhong, Yukai
Zhao, Ou
format Article
author Zhang, Lulu
Zhong, Yukai
Zhao, Ou
author_sort Zhang, Lulu
title Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
title_short Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
title_full Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
title_fullStr Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
title_full_unstemmed Press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
title_sort press-braked stainless steel channel sections under major-axis combined loading: tests, simulations and design
publishDate 2022
url https://hdl.handle.net/10356/159757
_version_ 1738844805687934976