Shear Strength of Composite Circular Reinforced Concrete–Filled Steel Tubes
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Volume 146, Issue 1
Abstract
The shear strength of composite circular concrete-filled steel tube (CFST) and reinforced concrete–filled steel tube (RCFST) structural members was investigated using finite-element analysis and existing test data. Results showed how a compression strut develops in concrete infill under shear load in the presence of low shear spans and provided the basis for proposing a mechanics-based shear strength equation for those composite members. The proposed equation quantifies the contribution of that strut to total strength as a function of shear span and accounts for the interactions between the steel tube and the concrete infill. The effectiveness of the proposed equation was compared with shear test data from the existing literature and was found to be safe; it accurately captures the contribution of the steel tube to the total strength and conservatively estimates that of the concrete.
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Acknowledgments
This work was sponsored by AASHTO, in cooperation with the Federal Highway Administration (FHWA), and was conducted in the National Cooperative Highway Research Program (NCHRP), which is administered 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 authors and do not necessarily reflect acceptance by or the views of the National Academy, the TRB, the FHWA, or AASHTO.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 6, 2018
Accepted: Apr 25, 2019
Published online: Oct 31, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 31, 2020
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