Shear Design and Assessment of Reinforced and Prestressed Concrete Beams Based on a Mechanical Model
Publication: Journal of Structural Engineering
Volume 142, Issue 10
Abstract
Safe and economical design and assessment of reinforced (RC) and prestressed concrete (PC) beams requires the availability of accurate but simple formulations which adequately capture the structural response. In this paper, a mechanical model for the prediction of the shear-flexural strength of PC and RC members with rectangular, I, or T sections, with and without shear reinforcement, is presented. The model is based on the principles of concrete mechanics and on assumptions supported by the observed experimental behavior and by the results of refined numerical models. Compact, simple, and accurate expressions are derived for design and verification of the shear strength, which incorporate the most relevant shear transfer actions. Excellent agreement between the predictions of the model and the results of the recently published ACI-DAfStb databases, including more than 1,287 tests on RC and PC beams with and without stirrups, has been observed. The theory behind the model provides consistent explanations for many aspects related to the shear response that are not clearly explained by current code formulations, making it a very helpful tool for daily engineering practice.
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Acknowledgments
The present work has been developed under the framework of research projects BIA2012-36848 and BIA2012-31432, funded by the Spanish Ministry of Economy and Competitiveness (MINECO) and the European Regional Development Fund (ERDF), and under the financial help of Infraestructures de Catalunya (ICAT).
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Published In
Journal of Structural Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 8, 2015
Accepted: Feb 9, 2016
Published online: Apr 15, 2016
Discussion open until: Sep 15, 2016
Published in print: Oct 1, 2016
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