In-Plane Shear Improvement of Unreinforced Masonry Wall Panels Using NSM CFRP Strips
Publication: Journal of Composites for Construction
Volume 17, Issue 6
Abstract
The large number of earthquake-prone vintage unreinforced masonry (URM) buildings in many seismically active parts of the world results in a need for minimally invasive and cost-effective strengthening techniques to enhance the poor earthquake performance of such buildings. The objective of the research reported here was to investigate the applicability of using near-surface-mounted (NSM) carbon fiber–reinforced polymer (CFRP) strips as a retrofitting technique for improving the in-plane shear strength and displacement capacity of multi-leaf URM walls constructed using solid clay brick masonry. The use of this technique for repairing earthquake damaged URM walls was also investigated. Ten multileaf wall panels measuring approximately were constructed using recycled vintage solid clay bricks and retrofitted using NSM CFRP strips with varying reinforcement ratios. These panels were loaded in diagonal compression, and the results were compared with those obtained from testing of nominally identical unretrofitted wall panels constructed using the same materials. In addition, four wall panels extracted from existing buildings were tested in an as-built condition and then later retested after being repaired using the NSM CFRP strip technique. Based on the experimental results it was established that the NSM CFRP strip technique provides a simple and cost effective method for substantially enhancing the shear strength and displacement capacity of understrength or damaged URM wall panels.
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Acknowledgments
The authors acknowledge the support of the technical staff of the Department of Civil and Environmental Engineering at the University of Auckland, as well as Contech Limited and Sika (NZ) for supplying the CFRP and epoxy used in the experimental campaign reported here. This research was conducted with financial support from the New Zealand Foundation for Research, Science and Technology.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 6 • December 2013
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 14, 2012
Accepted: May 17, 2013
Published online: May 20, 2013
Published in print: Dec 1, 2013
Discussion open until: Feb 18, 2014
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