Investigation of Cyclic-Shear Behavior of Circular-Reinforced Concrete-Filled Steel Tubes
Publication: Journal of Structural Engineering
Volume 146, Issue 5
Abstract
The cyclic-shear behavior of composite circular concrete-filled steel tubes (CFSTs) and reinforced concrete-filled steel tubes (RCFSTs) was experimentally and numerically investigated. Specimens with 32.39 and 40.64 cm diameters were considered, with diameter-to-thickness ratios of 51 and 64, respectively. The effects of longitudinal and transverse reinforcement were experimentally studied. The experimentally obtained strength values were compared to those from existing shear strength equations. Experimental results showed that the presence of an internal reinforcement doesn’t significantly impact the shear strength of RCFSTs. All specimens exhibited some amount of ductility under cyclic shear but not necessarily to the extent that would make it a preferred ductile mechanism. The mechanics governing the shear behavior of the CFSTs were studied using validated finite-element models. It was observed that a compression strut develops in the concrete under shear deformations. This strut also contributed to the shear strength of the composite CFSTs.
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Acknowledgments
This work was sponsored by the AASHTO in cooperation with the Federal Highway Administration (FHWA). It was conducted in the National Cooperative Highway Research Program (NCHRP), which is administrated by the Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine, under the research project NCHRP 12-93. The authors thank the NCHRP 12-93 Program Officer and the other members of the Project’s Advisory Panel. However, any opinions, findings, conclusions, and recommendations presented in this report are those of the writers and do not necessarily reflect acceptance by or the views of the National Academy, the TRB, the FHWA, or AASHTO.
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Information
Published In
Journal of Structural Engineering
Volume 146 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Feb 5, 2018
Accepted: Oct 8, 2019
Published online: Feb 27, 2020
Published in print: May 1, 2020
Discussion open until: Jul 27, 2020
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