In-Plane Shear Performance of Masonry Walls after Strengthening by Two Different FRPs
Publication: Journal of Composites for Construction
Volume 20, Issue 5
Abstract
This experimental study was aimed to investigate the in-plane shear performance of externally strengthened masonry walls using two types of fiber-reinforced polymer (FRP) sheets, namely, carbon FRP (CFRP) and polyethylene terephthalate-FRP (PET-FRP) sheets. Among these two, PET-FRP has a low tensile strength but possess a higher fracturing strain than CFRP. Twelve masonry walls made from clay brick were tested for static lateral loading under constant compression, after bonding CFRP and PET-FRP sheets onto their surfaces in three different configurations. The ultimate shear strength and deformation at peak load were the two important observations. The mechanisms by which load was carried were observed, varying from the initial uncracked state to the final, fully cracked state. The results demonstrate that a significant increase in the in-plane shear capacity of masonry can be achieved by bonding these two FRPs to the surface of the walls but ductility is compromised when CFRP is used. Walls retrofitting with PET-FRP in a crossdiagonal fashion show a good ductile behavior in both prepeak and postpeak regimes. The experimental data were used to assess the effectiveness of the strengthening of one FRP over the other. PET-FRP in diagonal configuration was found to be the most effective way of strengthening without compromising the two most essential aspects of masonry, that is, strength and ductility.
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Acknowledgments
The authors sincerely acknowledge the financial assistance from the CASR grant of KUET and from RONPAKU fellowship of JSPS to carry out this research. The authors are also thankful to Nippon Steel & Sumikin Materials Co. Ltd. Japan and Maeda Kosen Co. Ltd. Japan, for their support in providing necessary materials for CFRP and PET-FRP, respectively, that have been used in this experiment.
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Published In
Journal of Composites for Construction
Volume 20 • Issue 5 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 30, 2015
Accepted: Oct 23, 2015
Published online: Feb 11, 2016
Discussion open until: Jul 11, 2016
Published in print: Oct 1, 2016
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