Study of local buckling performance of 7075-T6 high-strength aluminium alloy H-section stub columns. (November 2022)

• Record Type: Journal Article
• Authors: Zhi, Xinhang; Wang, Yuanqing; Zhang, Ying; Li, Beibei; Ouyang, Yuanwen
• Is Part Of: Thin-walled structures. Volume 180(2022)
• Publication Date: 2022-11
• Subjects: High-strength aluminium alloy -- Local buckling -- H-section stub columns -- Testing -- Numerical simulation -- Direct strength method -- Reliability analysis; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2022.109925
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: The local buckling performance of 7075-T6 high-strength aluminium alloy extruded H-section stub columns are investigated in this paper. Seven H-section stub column tests were carried out, in which the material properties, initial geometric imperfections, failure modes, critical local buckling strengths and load carrying capacities of specimens are all reported. Then the finite element (FE) models were developed and validated against the test results. Upon validation, a thorough parametric study was conducted to obtain further data over a large range of cross-sections. Afterwards, on the basis of test results and FE data, provisions in the current design standards, GB 50429 (Chinese), EN 1999-1-1:2007 (European) and AADM 2015 (American) were evaluated. The design codes showed conservative strength predictions, especially for stub columns with large cross-section slenderness. A modified DSM design approach was proposed for 7075-T6 H-section stub columns, and the reliability analysis was performed to confirm the applicability of the proposed modified DSM approach. Highlights: Results of tests on 7075-T6 high-strength aluminium alloy H-section stub column presented. A thorough parametric study based on the validated finite method models over a wide range of cross-sections conducted. Provisions in the current design standards (GB 50429-2007, EN 1999-1-1:2007 and American Aluminium Design Manual 2015) evaluated. A revised direct strength design method (DSM) for 7075-T6 H-section stub columns proposed. Reliability analysis to assess the modified DSM design approach conducted.