Approximate formula for local buckling in thin-walled channels bent about the asymmetrical axis

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2025-05-17 DOI:10.1016/j.jcsr.2025.109647

Huy Hoang Vu , Quoc Anh Vu , Cao Hung Pham

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Abstract

This paper establishes expressions for computing the buckling coefficients of thin-walled channels bent about their asymmetric axis, having the web in compression. The objective is to replace the existing analytical solution in the AISI S100 Specification due to its lack of accuracy. A total of 1576 models of the Finite Element Method were simulated using ABAQUS software to solve the elastic buckling problem. A parametric study was conducted to investigate the rule of buckling coefficients. It was found that the local buckling mode occurring on the web is dominant regardless of the flange width. Data regression was performed to develop a new piecewise function for calculating the buckling coefficient. The newly proposed formulae are considered to better represent the dependency of buckling coefficients compared to existing studies and are, therefore, more accurate. The central formula, corresponding to industrial cross-sections, uses a simple power function with only a 2.6 % error. Factors accounting for the effects of material properties and corner radius on buckling coefficients, which have been ignored in existing studies, were also proposed.

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绕不对称轴弯曲的薄壁通道局部屈曲的近似公式

建立了沿不对称轴弯曲、腹板受压的薄壁通道屈曲系数的计算表达式。目标是取代AISI S100规范中现有的分析溶液，因为它缺乏准确性。利用ABAQUS软件对1576个有限元模型进行仿真，求解弹性屈曲问题。对屈曲系数的变化规律进行了参数化研究。结果表明，与翼缘宽度无关，腹板局部屈曲模式占主导地位。通过数据回归，建立了一种新的计算屈曲系数的分段函数。与现有的研究相比，新提出的公式被认为能更好地表示屈曲系数的相关性，因此更准确。与工业横截面相对应的中心公式使用了一个简单的幂函数，误差只有2.6%。提出了在现有研究中被忽略的材料性能和弯角半径对屈曲系数的影响因素。

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

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.