Development of a new classification system for the cold-formed steel bolted clip-angle beam-to-column connections

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.2025.113245

Nagaraju Mallepogu, Mahendrakumar Mathialagu Madhavan

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Abstract

A comprehensive experimental study was conducted on cold-formed steel (CFS) beam-to-column connections, which included a configuration featuring a 3-bolted clip-angle (CA) connecting the web portions and two flange-cleats (FC) linking the top and bottom flange sections of both the beam and column. A total of 22 laboratory tests were performed. An in-depth parametric analysis of the moment-rotation behaviour was carried out and design guidelines were suggested for the optimum design of the chosen connection. The observed failure modes in the tested specimens are local buckling and distortional buckling of the clip-angle connector, pull through and bearing failure in the top and bottom FC respectively. Most of these connections attain at least 80 % of the plastic moment capacities of the associated beam. A new classification system has been suggested for the CFS beam-to-column connections from the 108 collated test data of CFS connections with only web portions connected (Type 1), with web and top flange portions connected (Type 2) and web, top and bottom flange portions connected (Type 3). The CFS connections are classified into rigid, semi-rigid, and flexible types, depending on their strength and stiffness characteristics in relation to the properties of the connected CFS beam.

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冷弯型钢螺栓夹角梁柱连接新分类系统的开发

对冷弯型钢（CFS）梁柱连接进行了全面的实验研究，其中包括一种配置，其中包括连接腹板部分的3螺栓夹角（CA）和连接梁和柱的顶部和底部法兰部分的两个法兰夹板（FC）。总共进行了22次实验室检查。对其矩转特性进行了深入的参数分析，并为所选连接的优化设计提出了设计准则。试件观察到的破坏模式分别为夹角接头局部屈曲和扭曲屈曲，上部FC和底部FC的拉穿破坏和承载破坏。这些连接大多数达到至少80%的塑性弯矩能力的相关梁。根据108个CFS梁柱连接的试验数据，对仅腹板连接（类型1）、腹板与上翼缘连接（类型2）和腹板、上翼缘与下翼缘连接（类型3）的CFS梁柱连接提出了新的分类体系。根据连接的CFS梁的强度和刚度特性，CFS连接分为刚性、半刚性和柔性类型。

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.