Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns

Wang, Fangying; Zhao, Ou; Young, Ben

Abstract

A comprehensive experimental and numerical study of the cross-sectional compressive behaviour and resistances of press-braked S960 ultra-high strength steel (UHSS) angle and channel section stub columns is reported in this paper. The experimental study was carried out on four equal-leg angle sections and eight plain channel sections, and comprised material testing, initial local geometric imperfection measurements and 18 stub column tests. The experimental setups, procedures and key observations were fully presented. The experimental study was then supplemented by a finite element (FE) simulation programme, in which FE models were firstly developed to replicate the test structural responses and subsequently used to generate further numerical data over a wide variety of cross-section sizes. It is worth noting that the current international standards established in Europe, America and Australia/New Zealand only cover the design of structural members with material grades up to S700, and thus the examined S960 UHSS angle and channel section stub columns are out of the scope of the existing design standards. In this study, the experimentally and numerically acquired data was adopted to assess the applicability of the codified provisions and formulations to the design of S960 UHSS angle and channel section stub columns. The assessment results generally indicated that the current European code leads to overall consistent and accurate predictions of cross-section compression resistances, but with many overestimated predicted resistances for S960 UHSS channel section stub columns, while the American and Australian/New Zealand standards yield unduly scattered design cross-section compression resistances, with unsafe and overly conservative predicted resistances respectively for S960 UHSS channel section stub columns and slender angle section stub columns. Revised codified design rules were also proposed, and shown to yield safe, accurate and consistent design cross-section compression resistances for S960 UHSS angle and channel section stub columns.

Citation

Wang, F., Zhao, O., & Young, B. (2020). Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns. Engineering Structures, 204, https://doi.org/10.1016/j.engstruct.2019.109902

• Journal Article Type: Article
• Acceptance Date: Nov 6, 2019
• Online Publication Date: Nov 29, 2019
• Publication Date: Feb 1, 2020
• Deposit Date: Sep 22, 2020
• Publicly Available Date: Nov 30, 2020
• Journal: Engineering Structures
• Print ISSN: 0141-0296
• Electronic ISSN: 1873-7323
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 204
• Article Number: 109902
• DOI: https://doi.org/10.1016/j.engstruct.2019.109902
• Keywords: Civil and Structural Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/4920323
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S0141029619330500
• Additional Information: This article is maintained by: Elsevier; Article Title: Testing and numerical modelling of S960 ultra-high strength steel angle and channel section stub columns; Journal Title: Engineering Structures; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.engstruct.2019.109902; Content Type: article; Copyright: © 2019 Elsevier Ltd. All rights reserved.