Ultimate Shear Capacity of the Cold-Formed Steel Torsionally Restrained Beam-to-Column Moment Connection with a Three-Bolted Clip Angle and Flange Cleat
Publication: Journal of Structural Engineering
Volume 150, Issue 6
Abstract
In the current research work, the shear capacity of the cold-formed steel (CFS) three-bolted clip angle (CA) beam-to-column moment connection (3BM) is investigated with 45 laboratory test results. The 3BM connection comprises a three-bolted CA connector that connects the web portions and a bolted flange cleat (FC) that connects the flange portions of the beam and column; in comparison, the three-bolted shear connection (3BS) connects only the web portions of the beam and column. The presence of the FC improved the shear strength of the 3BM connection over the 3BS connection and it is quantified using a coefficient called the “rigidity factor ().” A shift in the failure mode of CAs from shear local buckling in a 3BS connection to tearing failure in a 3BM connection was observed as the FC resists beam torsional deformation and delays the early local buckling of the CA. The existing design shear equation of the 3BS connection is improved by expressing it as a function of CA failure modes. Following the same trend, the existing design shear method for the CFS moment connection is improved by incorporating the failure modes of the CA boundary conditions along with the geometric and material properties of both the CA and FC for the present 3BM connection. In addition, an empirical shear design equation is suggested for the 3BM connection. The design factors of the proposed 3BM shear equations for load and resistance factor design, limit state design, and allowable strength design methods were evaluated from the reliability study.
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Data Availability Statement
Some or all data used during the study are available from the corresponding author by request, including the values used for plotting the figures, the design calculation procedure, and photographs of failure modes of test specimens.
Acknowledgments
The authors would like to thank the Ministry of Education (MoE) of India for the financial support in the form of a fellowship for this research.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 6 • June 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Apr 27, 2023
Accepted: Nov 7, 2023
Published online: Mar 22, 2024
Published in print: Jun 1, 2024
Discussion open until: Aug 22, 2024
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