Flexural resistance of steel cellular beams subject to global-local buckling interaction: Direct strength method approach

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-04-02 DOI:10.1016/j.tws.2025.113266

Flávia Gimenez Berti , Adriano Silva de Carvalho , Alexandre Rossi , Vinicius Moura de Oliveira , João Pedro Martins , Luís Alberto P. Simões da Silva , Carlos Humberto Martins

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引用次数: 0

Abstract

Steel cellular beams are considerably more susceptible to stability-governed failure modes than I-section beams without perforations, particularly to local instabilities caused by the presence of the web openings. These openings result from the cutting and welding of the I-section, increasing its height and second moment of area about the strong axis. However, the beam's torsional stiffness reduces and other failure modes may arise. Lateral-torsional buckling (LTB), a widely studied type of global stability failure mode, is more likely to occur in these beam models due to the expansion of the section after cutting and welding to form openings in the web. On the other hand, web-post buckling (WPB), a type of local stability mode, occurs in the web region between the openings, and this is a failure mode exclusive to perforated cross-sections. While both failure modes have been extensively addressed in the literature individually, limited attention has been given to their interaction, underscoring the need for further investigation of cellular beams under these conditions. Therefore, this paper aims to assess the interaction between LTB and WPB exclusively in cellular beams. The proposed approach involves developing a design curve using the Direct Strength Method (DSM). Based on the analyses of 120 models, results indicate that a significant set of the studied members fail only due to LTB, while others fail due to WPB or due to the interaction between the two failure modes. Thus, a DSM-based curve was proposed to obtain the normalized ultimate bending moment of beams susceptible to interaction-driven failure modes with respect to the LTB resistance moment. The capacity is determined using the global-local slenderness of these steel profiles.

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整体-局部屈曲相互作用下钢蜂窝梁的抗弯抗力：直接强度法方法

与没有穿孔的工字截面梁相比，蜂窝钢梁更容易受到稳定控制的破坏模式的影响，特别是由于腹板开口的存在而引起的局部不稳定。这些开口来自于工字截面的切割和焊接，增加了其高度和围绕强轴的二次力矩。然而，梁的扭转刚度降低，并可能出现其他破坏模式。横向扭转屈曲（LTB）是一种被广泛研究的整体稳定破坏模式，在这些梁模型中更容易发生，因为切割和焊接后截面膨胀，在腹板上形成开口。另一方面，腹板柱屈曲（WPB）是一种局部稳定模式，发生在开口之间的腹板区域，这是穿孔截面所特有的破坏模式。虽然这两种失效模式在文献中都得到了广泛的讨论，但对它们的相互作用的关注有限，这强调了在这些条件下进一步研究细胞梁的必要性。因此，本文旨在专门研究蜂窝波束中LTB和WPB的相互作用。提出的方法包括使用直接强度法（DSM）开发设计曲线。基于对120个模型的分析，结果表明，研究的构件中有相当一部分仅由于LTB而失效，而其他构件则由于WPB或两种失效模式的相互作用而失效。因此，提出了一种基于dsm的曲线，以获得受相互作用驱动破坏模式影响的梁相对于LTB阻力矩的归一化极限弯矩。使用这些钢型材的整体-局部长细比来确定容量。

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.