Laboratory tests, numerical simulations and design of press-braked S690 high strength steel channel sections under major-axis combined loading. (15th February 2023)

• Record Type: Journal Article
• Authors: Zhang, Lulu; Zhao, Ou
• Is Part Of: Engineering structures. Volume 277(2023)
• Publication Date: 2023-02-15
• Subjects: Combined compression and major-axis bending -- Design interaction curves -- Eccentric compression tests -- New design proposal -- Numerical modelling -- Press-braked channel sections -- S690 high strength steel; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.115456
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The behaviour of press-braked S690 high strength steel channel sections under major-axis combined loading was studied. 20 major-axis eccentric compression tests were conducted. FE models were developed and validated and then used to perform parametric studies. The codified design interaction curves were assessed based on the test and FE data, indicating conservatism. New design interaction curves were proposed, showing a high level of accuracy. Abstract: Testing and numerical modelling have been conducted to investigate the cross-sectional behaviour and resistances of press-braked S690 high strength steel channel sections under combined compression and major-axis bending. The testing programme included initial local geometric imperfection measurements and twenty major-axis eccentric compression (combined loading) tests. The numerical modelling programme included a validation study, where finite element models were developed and validated against test results, and a series of parametric studies, where the developed finite element models were adopted to generate further numerical data over a wide range of cross-section dimensions and loading combinations. The obtained test and numerical data were used to evaluate the existing design interaction curves for press-braked S690 high strength steel channel sections under combined compression and major-axis bending, as specified in the European code, North American specification, and Australian/New Zealand standard. The evaluation results revealed that the codified design interaction curves led to conservative resistance predictions, owing to the linear shapes and inaccurate end points. Improved design interaction curves featuring more efficient shapes and anchored to more accurate end points were then proposed. The proposed design interaction curves were shown to result in more accurate resistance predictions for press-braked S690 high strength steel channel sections under combined compression and major-axis bending than their codified counterparts. The reliability of the proposed design interaction curves was confirmed by means of statistical analyses.