Cold-formed steel octagonal hollow section (OctHS) beam-columns: Numerical studies and design recommendations

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-09 DOI:10.1016/j.tws.2025.113963

Haixin Liu , Jiong-Yi Zhu , Junbo Chen , Tak-Ming Chan

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引用次数: 0

Abstract

This paper first proposes a generalised finite element modelling (FEM) methodology for cold-formed steel tubular beam-columns considering the material variation, initial geometric imperfection, and boundary condition. The proposed FE model is proven to be capable of accurately replicating the structural behaviour of cold-formed steel rectangular hollow section and circular hollow section beam-columns regarding the obtained ultimate strengths and axial load versus mid-height lateral deflection curves. Following the successful validation of generalised FEM methodology, this methodology is extended to the numerical modelling of the cold-formed steel octagonal hollow section beam-column. A total of 5246 numerical models of the OctHS beam-column covering a broad spectrum of steel grades, geometric profiles, and loading eccentricities are subsequently generated to form an essential database. Based on the evaluation of numerical results, design recommendations and modifications to the current standards for structural steel design have been proposed to improve the prediction accuracy. Corresponding reliability analyses following different evaluation procedures are also performed, and the reliability analysis results indicate the effectiveness of the design recommendation and modification.

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冷弯型钢八角空心截面（OctHS）梁柱：数值研究和设计建议

本文首先提出了考虑材料变化、初始几何缺陷和边界条件的冷弯钢管梁柱的广义有限元建模方法。所提出的有限元模型被证明能够准确地复制冷弯型钢矩形空心截面和圆形空心截面梁柱的结构行为，关于所获得的极限强度和轴向载荷与中高度横向挠度曲线。在对广义有限元方法进行成功验证后，将该方法推广到冷弯型钢八角形空心截面梁柱的数值模拟中。随后生成了5246个OctHS梁柱的数值模型，涵盖了广泛的钢种、几何轮廓和加载偏心，形成了一个基本的数据库。在对数值结果进行评估的基础上，提出了设计建议和对现行钢结构设计标准的修改，以提高预测精度。采用不同的评估方法进行了相应的可靠性分析，可靠性分析结果表明了设计建议和修改的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.