Plastic mechanism models for use in DSM localised loading design of hat sections

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-11-08 DOI:10.1016/j.tws.2024.112683

Zhehang Chen, Cao Hung Pham, Gregory J. Hancock

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Abstract

The Direct Strength Method (DSM) of design has been recently developed for the design of cold-formed steel members under localised loading. The method requires a yield load (P_y) and an elastic buckling load (P_cr) as input variables to the DSM design equations. This paper summarises test results used to develop plastic mechanism models for calculating P_y for hat sections subject to practical loading cases. All four loading cases, including Interior Two Flange (ITF), End Two Flange (ETF), Interior One Flange (IOF) and End One Flange (EOF) loading cases were investigated. The yield/plastic mechanism behaviour of multiple web sections is not yet fully understood, while several publications in the literature have discussed the mechanical behaviour of hat sections under localised loading. Hence, this paper explains and proposes a plastic mechanism model based on the experimental data for calculating the yield load (P_y) to be used in the DSM for localised loading design of hat sections in conjunction with the elastic buckling load P_cr.

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用于帽子截面 DSM 局部加载设计的塑性机理模型

最近开发了直接强度设计法（DSM），用于设计局部荷载下的冷弯型钢构件。该方法要求将屈服载荷 (Py) 和弹性屈曲载荷 (Pcr) 作为 DSM 设计方程的输入变量。本文总结了用于开发塑性机理模型的测试结果，以计算实际加载情况下帽形截面的 Py 值。本文研究了所有四种加载情况，包括内部两翼缘 (ITF)、端部两翼缘 (ETF)、内部一翼缘 (IOF) 和端部一翼缘 (EOF) 加载情况。多腹板截面的屈服/塑性机理行为尚未被完全理解，而文献中的一些出版物讨论了局部加载情况下帽子截面的力学行为。因此，本文解释并提出了一个基于实验数据的塑性机理模型，用于计算屈服载荷 (Py)，并将其与弹性屈曲载荷 Pcr 一起用于帽子截面局部加载设计的 DSM 中。

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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.