Moment capacity of cold-formed steel channel beams with edge-stiffened and unstiffened elongated web holes

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2024-10-26 DOI:10.1016/j.tws.2024.112605

Dinesh Lakshmanan Chandramohan , Krishanu Roy , Zhiyuan Fang , Beulah Gnana Ananthi. G , James B.P. Lim

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引用次数: 0

Abstract

Cold-formed steel channel beams (CFSCB) often incorporate web holes to accommodate building services, but this reduces their moment capacity due to decreased web area. Recent studies have shown that a new type of edge-stiffened web holes can enhance moment capacity, especially for circular ones, and can now be extended to elongated web holes. However, there hasn't been research on the moment capacity of such CFSCB with elongated web holes. This paper uses finite element analysis (FEA) to examine the moment capacity and flexural behaviour of such beams with both elongated edge-stiffened web holes (EEH) and elongated unstiffened web holes (EUH). After validating the FEA models against experimental results available in the literature, a comprehensive parametric study involving 2160 FEA models was conducted. Results showed that CFSCB with EEH exhibited, on average, a 9 % increase in moment capacity compared to those with EUH. Additionally, the parametric results were compared with the design capacities calculated from existing standards for CFSCB with unstiffened web holes. It was found that the current design equations for CFSCB with EUH were overly conservative by 9 % and 66 %, on average, for distortional or local buckling failure and lateral-torsional buckling failure, respectively. Consequently, modified Direct Strength Method (DSM) design equations were proposed to calculate the moment capacity of CFSCB with both EEH and EUH. Finally, a reliability analysis was conducted to assess the accuracy of the proposed design equations.

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带有边缘加劲和非加劲细长腹板孔的冷弯槽钢梁的承载力

冷弯槽钢梁（CFSCB）通常会在腹板上开孔，以容纳建筑设施，但由于腹板面积减少，会降低其弯矩承载能力。最近的研究表明，一种新型的边缘加固腹板孔可以提高弯矩承载能力，尤其是圆形腹板孔，现在还可以扩展到加长腹板孔。然而，目前还没有关于这种带有细长腹板孔的 CFSCB 的弯矩承载能力的研究。本文采用有限元分析法（FEA）研究了带有加长边缘加劲腹板孔（EEH）和加长非加劲腹板孔（EUH）的此类梁的承载力和抗弯性能。在根据文献中的实验结果对有限元分析模型进行验证后，进行了一项涉及 2160 个有限元分析模型的综合参数研究。研究结果表明，与带 EUH 的 CFSCB 相比，带 EEH 的 CFSCB 的弯矩承载能力平均提高了 9%。此外，还将参数化结果与根据现有标准计算出的带有非加固腹板孔的 CFSCB 的设计承载力进行了比较。结果发现，对于扭曲或局部屈曲失效以及横向扭转屈曲失效，带 EUH 的 CFSCB 的现行设计公式过于保守，平均分别保守了 9% 和 66%。因此，提出了修改后的直接强度法（DSM）设计方程，用于计算带 EEH 和 EUH 的 CFSCB 的弯矩承载力。最后，还进行了可靠性分析，以评估所提出的设计方程的准确性。

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.