Double-HSS Seismic Resistant Beam-to-Column Moment Connections
Publication: Journal of Structural Engineering
Volume 147, Issue 7
Abstract
Hollow structural sections (HSSs) are highly efficient in resisting compression, torsion, and bending. Their high torsional rigidity generally eliminates lateral-torsional buckling (LTB), which in turn eliminates the need for lateral bracing in flexural members. As a result, their plastic rotational capacity is mainly governed by flange local buckling (FLB) and web local buckling (WLB). Moment-resisting connections for single-HSS flexural members can be complicated. This study investigates the behavior of double-HSS flexural members under large displacement reversals. The study configuration consists of a double-HSS beam connected to a column through a center gusset plate secured by flare-bevel groove welds. The advantages of the proposed double-HSS moment connection are: (1) compared to a single-HSS, it effectively reduces the width-thickness ratios () of the flanges by using a double-HSS, thereby considerably increasing the member’s compactness and ductility; (2) it provides simple and practical connection details between the beam and column; and (3) it eliminates the need for lateral bracing. In addition, on-site welding can be eliminated by using shop-welded double-HSS beam-column stubs spliced by a bolted end connection. Experimental tests indicate that the proposed double-HSS moment connections showed a stable response up to a story drift angle of approximately 0.07 rad for the HSS sizes tested. Nonlinear finite-element analyses, including fracture behavior via the extended finite-element method (XFEM), were used to simulate test results, and finite-element analysis (FEA) was used to formulate the design procedure for the center gusset plate and welds connecting the double-HSS beam and column flange.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported in part by the US National Science Foundation (NSF) under Award No. 0936563 and material donation from Falcon Steel Company, Haltom City, TX. Mr. John Tornberg, Principal of Structural Solutions, Inc. in Ft. Worth, TX, provided information regarding the welding practice on HSS members.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 19, 2020
Accepted: Feb 23, 2021
Published online: Apr 28, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 28, 2021
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