Average Crack Spacing of Overlay-Strengthened RC Beams
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 10
Abstract
This research evaluates the average crack spacing of overlay-strengthened RC beams. Current equations in different structural codes for predicting the average crack spacing of RC beams with multilayered reinforcing bars have proved inapplicable to overlay-strengthened RC beams, although both types of beams are reinforced with multiple layers. We have developed a simple, practical analytical model that can predict the average crack spacing of this type of beam. We analyzed an overlay-strengthened beam element using equilibrium and compatibility equations to formulate the average stresses of concrete, overlay, and tension reinforcement. Then we made a series of comparisons among various types of beam elements, using the experimental investigations to verify the model’s validity and reliability. The proposed model performs satisfactorily against measured responses from the experimental database.
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Acknowledgments
This study is part of the International Collaborative Research, Life Cycle Prediction and Management of Concrete Structures, adopted by the Asia-Africa S & T Strategic Cooperation Promotion Program of Special Coordination Funds for Science and Technology, Japan’s Ministry of Education, Culture, Sports, Science and Technology. The writers appreciate financial aid from Hokkaidō University and the Grant-in-Aid for Scientific Research (A) UNSPECIFIEDNo. 22246058. Dr. Kouichi Satoh of the Research Institute of Nara Construction Co., Ltd., is sincerely acknowledged for providing the writers with a detail of his test database.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 10 • October 2011
Pages: 1460 - 1472
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 14, 2010
Accepted: Mar 31, 2011
Published online: Apr 2, 2011
Published in print: Oct 1, 2011
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