Chapter
Apr 26, 2012
Evaluation of a Sprayable, Ductile Cement-Based Composite for the Seismic Retrofit of Unreinforced Masonry Infills
Authors: Sarah L. Billington [email protected], Marios A. Kyriakides, Ben Blackard, Kaspar Willam [email protected], Andreas Stavridis, and P. Benson Shing [email protected]Author Affiliations
Publication: Improving the Seismic Performance of Existing Buildings and Other Structures
Abstract
A new retrofit technique for unreinforced masonry infills in non-ductile reinforced concrete frame structures is being investigated. The proposed technique uses a thin layer of sprayable, ductile fiber-reinforced mortar material referred to as Engineered Cementitious Composites, or ECC. The aim of the retrofit is to hold the masonry wall together to delay infill and frame strength degradation and enhance system ductility. Proof-of-concept experiments on retrofitted masonry prisms and beams demonstrated large increases in strength and ductility. Quasi-static, in-plane, cyclic testing of small-scale frames with masonry infills including 3 retrofit designs demonstrated a 10x increase in ductility in one design relative to the unretrofitted system. Results were used to design a retrofit for a 2/3-scale, in-plane test, where a 2.6 x increase in ductility was achieved. Several finite element modeling approaches are under investigation for use in system predictions and further retrofit analyses.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Affiliations
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020. E-mail: [email protected]
Marios A. Kyriakides
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020
Ben Blackard
Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, CO 80202-0428
Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, CO 80202-0428. E-mail: [email protected]
Andreas Stavridis
Department of Structural Engineering, University of California, San Diego, CA 92093-0085
Department of Structural Engineering, University of California, San Diego, CA 92093-0085. E-mail: [email protected]
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