Efficiency of CFRP Strengthening in Controlling the Deflection of RC Beams in a Redundant Structural System
Publication: Journal of Composites for Construction
Volume 20, Issue 2
Abstract
One-way reinforced concrete joist floor with wide shallow beams (WSBs) are used widely in building construction throughout the Middle East. Situations arise when it is desirable to strengthen a specific member or a group of members in a floor to reduce their deflections. Extensive work has been made on the strengthening of isolated members using fiber-reinforced polymers (FRP) for providing much needed data on the member performance and characteristics where the ultimate goal is to apply these findings to actual complex existing structures. Judging by studies on individual isolated members strengthened with FRP, a substantial improvement in deflection control is expected. However, this cannot be directly applied to members in redundant structural systems before confirming that experimentally. This paper presents the results of an investigation on the effectiveness of carbon FRP (CFRP) external strengthening for the purpose of reducing deflection of WSBs as part of joist floor of a prototype reinforced concrete building with highly redundant structural system. The results indicated that using CFRP strengthening did not show much improvement in controlling the deflection of the beams. The experimental work was also complemented with theoretical explanation of the expected effectiveness in terms of parallel spring analogy. Further, a nonlinear finite element analysis for the floor system was conducted. The results of that analysis were in good agreement with the experimental findings.
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Acknowledgments
The authors would like to acknowledge the financial support from the Center of Excellence for Research in Engineering Materials (CEREM) and the Center of Excellence for Concrete Research & Testing (CoE-CRT) at the College of Engineering–King Saud University. The help of engineers and technicians in the CoE-CRT and in the structural laboratory of Civil Engineering Department at King Saud University is highly appreciated.
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Information & Authors
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Published In
Journal of Composites for Construction
Volume 20 • Issue 2 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Feb 19, 2015
Accepted: Jun 11, 2015
Published online: Sep 10, 2015
Discussion open until: Feb 10, 2016
Published in print: Apr 1, 2016
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