An experimental study on web-bearing resistance of cold-formed steel sigma-shaped sections with web holes under interior-two-flange loading case

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-10-11 DOI:10.1016/j.tws.2024.112579

Boshan Chen , Yecheng Dai , Wei Wang , Youtian Wang , Lisheng Luo , Peng Dai , James Lim

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Abstract

Cold-formed steel (CFS) sigma-shaped sections used as flooring joists and bearers are commonly fabricated with web holes to accommodate building services. These sections featuring web stiffeners and curved lips exhibit lower web-bearing resistance than traditional lipped channel sections. However, the web-bearing resistance of CFS sigma-shaped sections with web holes has not been thoroughly investigated. To address this gap, a detailed experimental investigation was conducted, testing 29 CFS sigma-shaped sections with web holes under an interior-two-flange (ITF) loading case. For comparison, specimens without web holes were also tested. Variables such as hole diameter ratio, hole location, bearing length, and flange condition were examined. A finite element (FE) model was developed and validated against the test results. The results indicated that the web-bearing resistance for specimens with web holes was reduced by 24.0 % on average. To assess the accuracy of existing design specifications, the test results were compared against the design strengths predicted by the American Iron and Steel Institute (AISI) (2016), Australian and New Zealand Standards (AS/NZS) (2018), European Standard (EC3) (2006), and Uzzaman et al. (2012). The comparison revealed that the design strength predicted by Uzzaman et al. (2012) agreed well with the test results.

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带腹板孔的冷弯型钢西格玛形截面在内部两翼缘加载情况下的腹板承载阻力实验研究

用作楼板托梁和承重梁的冷弯型钢（CFS）西格玛型钢通常带有腹板孔，以便安装建筑设施。这些具有腹板加劲件和弧形唇缘的型材的腹板承载阻力低于传统的唇缘槽型材。然而，带腹板孔的 CFS Σ 形截面的腹板承载阻力尚未得到深入研究。为了填补这一空白，我们进行了详细的实验研究，在内部两翼缘（ITF）加载情况下测试了 29 个带腹板孔的 CFS sigma 形截面。为了进行比较，还测试了无腹板孔的试样。对孔直径比、孔位置、轴承长度和凸缘条件等变量进行了研究。开发了一个有限元（FE）模型，并根据测试结果进行了验证。结果表明，带有腹板孔的试样的腹板承载阻力平均降低了 24.0%。为评估现有设计规范的准确性，将测试结果与美国钢铁协会（AISI）（2016 年）、澳大利亚和新西兰标准（AS/NZS）（2018 年）、欧洲标准（EC3）（2006 年）和 Uzzaman 等人（2012 年）预测的设计强度进行了比较。比较结果表明，Uzzaman 等人（2012 年）预测的设计强度与测试结果十分吻合。

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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.