Design of short-to-intermediate slender built-up flanged cruciform columns

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-03-08 DOI:10.1016/j.tws.2025.113181

Jelena Dobrić , Nina Gluhović , Aljoša Filipović , Mileva Samardžić-Petrović , Xiongfeng Ruan , Barbara Rossi

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引用次数: 0

Abstract

This paper explores the structural behaviour of cold-formed austenitic stainless steel flanged cruciform section columns through a combination of experimental and numerical methods, focusing on the influence of discrete fasteners on their flexural and torsional stiffness. The columns are designed as doubly symmetrical built-up sections, utilizing four star-oriented lipped equal-leg angle profiles interconnected with M8 bolts of class 8.8. Four intermediate slender built-up cruciform section columns, each measuring 2250 mm in length and featuring various fastener arrangements, were tested under semi-rigid support conditions and subjected to pure axial compression. The specimens failed due to a combination of torsional and local buckling. Following the experimental campaign, a parametric study was conducted based on experimentally validated numerical models to investigate key variables such as cross-sectional dimensions, column length, and bolt spacing. The experimental and numerical findings regarding the failure modes of the columns and their corresponding buckling resistances were compared with theoretical predictions. The recently proposed design procedures for carbon steel columns, based on the Direct Strength Method for built-up sections and the established Perry-Robertson design curve for solid cruciform sections, were evaluated. Results indicated that these procedures exhibited insufficient accuracy and significant data scatter, which necessitated modifications for improved predictions. The new design equations enhance accuracy and reliability, laying the groundwork for their potential incorporation into future standards.

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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.