Cyclic Response of Nonductile Reinforced Concrete Frames with Unreinforced Masonry Infills Retrofitted with Engineered Cementitious Composites
Publication: Journal of Structural Engineering
Volume 140, Issue 2
Abstract
A new seismic retrofit technique for unreinforced masonry infills in nonductile reinforced concrete frames is presented. The objective was to develop a light and easy to apply retrofit technique for the infills that both delays shear failure at the columns of the nonductile bounding frame when subjected to an earthquake by preventing severe deterioration of the infill wall, and enhances the ductility of the system. The retrofit technique uses sprayable engineered cementitious composites (ECCs), a micromechanically designed cement-based material reinforced with short, randomly distributed polymeric fibers. Four small-scale unreinforced masonry infilled nonductile reinforced concrete frames were tested under in-plane quasi-static cyclic lateral loading. One unretrofitted wall and three different retrofit schemes were evaluated. Continuous steel reinforcement was embedded in the ECC layer and a bonding agent was applied between the masonry wall and the ECC layer. In two retrofits the impact of two different schemes using shear dowels to connect the concrete beams with the ECC retrofit were examined. The tests have demonstrated that the ECC retrofit strategy can enhance substantially the ductility of the structural system as it undergoes cyclic lateral loading.
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Acknowledgments
This research is sponsored by a grant from the National Science Foundation (NSF-NEESR Grant No. 0530737). The authors thank Soares Masonry Inc. for the generous donation of building the infill walls as well as Williams Form, Kuraray Co. Ltd., U.S. Silica Company, Salt River Materials Group, Univar USA Inc., LaFarge, and Kerneos Inc for additional material donations. Collaboration and input from Professors Benson Shing and Kaspar Willam as well as the professional advisory panel of Joseph Maffei, Greg Kingsley, Dave Brieholtz, John Kariotis, Ron Mayes, Paul Murray, and Mike Valley are gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 2 • February 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 6, 2012
Accepted: Feb 25, 2013
Published online: Oct 4, 2013
Published in print: Feb 1, 2014
Discussion open until: Mar 4, 2014
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