Experimental and Analytical Approach for Prediction of Out-of-Plane Capacity of Reinforced Masonry Walls Strengthened with Externally Bonded FRP Laminate
Publication: Journal of Composites for Construction
Volume 23, Issue 4
Abstract
This experimental study has shown the effectiveness of fiber-reinforced polymer (FRP) external bonding (EB) in enhancing the flexural capacity of reinforced masonry (RM) walls subjected to out-of-plane cyclic load. Twelve reinforced masonry walls were built using fully grouted concrete masonry units. The walls had three different steel reinforcement amounts, 2#3, 2#4, and 1#5, representing typical underreinforced wall sections. The strengthened walls used two FRP types, wet lay-up glass fiber sheet (GFRP) and prefabricated carbon fiber-reinforced polymer laminate (CFRP). Four RM walls without strengthening were used as reference specimens. Six walls were externally strengthened using one and two sheets of GFRP. The remaining walls were strengthened with one and two CFRP laminate. A simple model was developed to predict the FRP debonding strain. Nonlinear analysis can be conducted using the moment-curvature relation. As a result of this study, the proposed model presents an excellent prediction compared to the experimental results. Different modes of failure, including compressive concrete crushing failure, FRP rupture, shear failure, and FRP debonding from the masonry substrate, occurred in the strengthened reinforced walls.
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Acknowledgments
The authors wish to acknowledge the support of Midwest Block and Brick in Jefferson City, Missouri and the Higher Committee for Education Development (HCED) in Iraq. The authors also wish to thank the technical support staff in not only the Department of Civil and Environmental Engineering but also the Center for Infrastructure Engineering Studies (CIES) at Missouri University of Science and Technology for their efforts in this research study. Any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsor or supporting agencies.
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Journal of Composites for Construction
Volume 23 • Issue 4 • August 2019
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©2019 American Society of Civil Engineers.
History
Received: Feb 26, 2018
Accepted: Nov 29, 2018
Published online: May 17, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 17, 2019
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