Experimental investigation into the axial compressive buckling behavior of LQ550 cold-formed channel columns with web openings

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-22 DOI:10.1016/j.tws.2025.114017

Dengfeng Wang , Jingwen Wang , Siyang Liu , Zhengyong Liu , Baoping Zhong

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引用次数: 0

Abstract

In recent years, cold-formed thin-walled steel members have been extensively utilized in prefabricated structures owing to their lightweight and high-strength properties. However, openings in the column web for accommodating water, electricity, heating, and ventilation ducts significantly affect the axial compressive bearing capacity, warranting a comprehensive investigation. This study conducts axial loading tests on LQ550 high-strength cold-formed thin-walled steel channel sections with web openings. The findings indicated that the presence of openings does not significantly affect the buckling mode; however, it intensifies the magnitude of buckling deformation and diminishes the bearing capacity of the columns. Short columns with openings predominantly undergo distortional-local buckling, while long columns exhibit distortional-local-global interactive buckling. The openings affect the location of buckling in the column. Local and distortional buckling in columns with varying heights predominantly occurs in the vicinity of the openings. However, for slender columns, the correlation between the position of maximum global deflection and the opening locations is negligible. The opening size exhibits the most significant impact on bearing capacity, followed by the number of openings, while the opening shape demonstrates the least effect. For the same number of openings, although sections with wide web exhibit a wider range and degree of local buckling around the openings, the reduction in bearing capacity for narrow-web sections is more pronounced. Finally, a conservative recommendation for the reduction coefficient of bearing capacity for the perforated columns is proposed.

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LQ550带腹板开口冷弯槽柱轴向压缩屈曲行为试验研究

近年来，冷弯薄壁钢构件以其轻量化、高强的特点在预制结构中得到了广泛的应用。然而，用于容纳水、电、供暖和通风管道的柱腹板开口显著影响轴压承载力，需要进行全面调查。本文对LQ550高强度冷弯薄壁带腹板开口槽钢进行了轴向加载试验。结果表明，孔洞的存在对屈曲模态没有显著影响；然而，它加剧了柱的屈曲变形，降低了柱的承载能力。有开口的短柱主要发生扭曲-局部屈曲，而长柱则表现为扭曲-局部-全局相互作用屈曲。开孔影响柱内屈曲的位置。不同高度柱的局部屈曲和变形屈曲主要发生在孔洞附近。然而，对于细长柱，最大总挠度位置与开口位置之间的相关性可以忽略不计。孔口尺寸对承载力影响最大，孔口数量次之，孔口形状影响最小。对于相同数量的开口，虽然宽腹板截面在开口周围表现出更大的范围和程度的局部屈曲，但窄腹板截面的承载力下降更为明显。最后，提出了穿孔柱承载力折减系数的保守建议。

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.