Local buckling behaviour of web perforated cold-formed steel lipped channel columns

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-09-12 DOI:10.1016/j.tws.2024.112448

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Abstract

To connect beams and bracings with storage rack uprights, closely spaced perforations are provided along the web, flanges, and rear flanges of uprights. These perforations can significantly lower the ultimate capacity of such compression members with the possible influence of its natural buckling modes. This capacity reduction can depend on various parameters such as (a) geometrical shape, proportioning of cross-section, and stiffeners; (b) perforation shape, size, spacing, and location; (b) slenderness of member, cross-section, and elements of cross-section; and (d) material properties. A thorough understanding of the influence of the above-mentioned factors is necessary for the accurate strength prediction of perforated Cold-formed steel (CFS) compression members. Even though the current design standards are updated for the accurate strength prediction of unperforated CFS compression members, they do not collectively account for the influence of all the aforementioned factors on the load-carrying capacity of the perforated CFS members, particularly for the local buckling capacity. Though the Direct Strength Method (DSM) of design is the most accepted method for accurate strength prediction of CFS members even for complex cross-sectional shapes, recent research on the strength evaluation of perforated CFS members using DSM has emphasized the need for refinement in DSM. The Modified Direct Strength Method (MDSM), which accounts for the simultaneous buckling of flanges and web, includes the cross-section aspect ratio and cross-section slenderness to predict more accurately the local buckling design strength. However, it was developed only for unperforated specimens. Hence, a systematic experimental and numerical investigation was done to understand the influence of the perforation in the local buckling behavior of the lipped channel section. In total, 14 specimens, including 2 unperforated and 12 web perforated CFS lipped channel stub columns were physically tested with fixed support conditions. The Finite Element Analysis using ABAQUS software was used to conduct an extensive parametric numerical study. The results were used to compare the strength curves of DSM and MDSM and the modification in the design curves has been proposed by considering the erosion in strength due to the presence of perforation.

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腹板穿孔冷弯槽钢立柱的局部屈曲行为

为了将横梁和支撑件与仓储货架立柱连接起来，需要在立柱的腹板、翼板和后翼板上设置间距较近的穿孔。这些穿孔会大大降低此类受压构件的极限承载能力，并可能对其自然屈曲模式产生影响。承载能力的降低取决于各种参数，例如：（a）几何形状、横截面比例和加强筋；（b）穿孔形状、尺寸、间距和位置；（b）构件、横截面和横截面元素的细长度；以及（d）材料特性。要准确预测穿孔冷弯型钢 (CFS) 压缩构件的强度，就必须全面了解上述因素的影响。尽管目前的设计标准已经更新，可以准确预测未穿孔 CFS 压缩构件的强度，但它们并没有综合考虑上述所有因素对穿孔 CFS 构件承载能力的影响，尤其是对局部屈曲能力的影响。尽管直接强度设计法（DSM）是最广为接受的 CFS 构件精确强度预测方法，即使是复杂截面形状的 CFS 构件，但最近关于使用直接强度设计法评估穿孔 CFS 构件强度的研究强调了改进直接强度设计法的必要性。修正的直接强度法（MDSM）考虑了翼缘和腹板的同时屈曲，包括横截面长宽比和横截面细长度，可以更准确地预测局部屈曲设计强度。然而，该方法仅适用于未穿孔的试样。因此，我们进行了系统的实验和数值研究，以了解穿孔对带衬里槽钢截面局部屈曲行为的影响。在固定支撑条件下，总共对 14 个试样进行了物理测试，其中包括 2 个未穿孔和 12 个腹板穿孔的 CFS 搁置槽支柱。使用 ABAQUS 软件的有限元分析进行了广泛的参数数值研究。研究结果用于比较 DSM 和 MDSM 的强度曲线，并考虑到穿孔对强度的侵蚀，提出了修改设计曲线的建议。

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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.