Behaviour and moment capacity of built-up back-to-back CFS channel members bent about the minor axis

Article

Han, Ngoc Duc, Vy, Son Tung, Vu, Anh Tuan and Nguyen, Andy. 2025. "Behaviour and moment capacity of built-up back-to-back CFS channel members bent about the minor axis." Structures. 80 (2025). https://doi.org/10.1016/j.istruc.2025.110001
Article Title

Behaviour and moment capacity of built-up back-to-back CFS channel members bent about the minor axis

ERA Journal ID211389
Article CategoryArticle
AuthorsHan, Ngoc Duc, Vy, Son Tung, Vu, Anh Tuan and Nguyen, Andy
Journal TitleStructures
Journal Citation80 (2025)
Article Number110001
Number of Pages11
Year2025
PublisherElsevier
ISSN2352-0124
Digital Object Identifier (DOI)https://doi.org/10.1016/j.istruc.2025.110001
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2352012425018168
Abstract

Built-up back-to-back cold-formed steel (CFS) channel members (BBC members) have been increasingly used in building structures in recent years. However, the knowledge and understanding of BBC members bent about the minor axis are still limited. In this research study, the behaviour and design of BBC members bent about the minor axis were investigated based on finite element (FE) analyses. In the first stage, experimental results from previous tests on the minor-axis bending of BBC members were reviewed. Later, FE models were developed and validated against these results. Using the validated FE models, a parametric study was conducted. It showed that the built-up screw spacing had minimal impact on BBC members with pinned warping-fixed ends, while these members exhibited considerably higher moment capacities than the sum of their individual members. The FE analysis results also proved that the existing direct strength method (DSM) design rules in the current CFS design standards are over-conservative. Consequently, new DSM-based design equations were proposed, offering more accurate and reliable predictions. Finally, design recommendations were also provided to support the efficient and economical use of BBC members in practice.

KeywordsCold-formed steel; Built-up back-to-back channel; Direct strength method; Moment capacity; Minor axis
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400510. Structural engineering
401607. Metals and alloy materials
Byline AffiliationsHanoi University of Civil Engineering, Vietnam
Queensland University of Technology
School of Engineering
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Modelling techniques for structural evaluation for bridge assessment
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Damage detection in asymmetric buildings using vibration-based techniques
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