New Design Detail to Enhance the Seismic Performance of Ordinary Reinforced Partially Grouted Masonry Structures
Publication: Journal of Structural Engineering
Volume 142, Issue 12
Abstract
Recent studies have shown that in the event of a strong earthquake, partially grouted (PG) masonry walls would most likely not perform according to code expectations. The research reported herein is focused on introducing an economically competitive design detail to enhance the seismic performance and safety index of PG reinforced masonry shear walls. Besides the conventional design details of single grouted vertical cells with single bond beams, two other details called double grouted vertical cells with double bond beams, and double grouted vertical cells with single bond beams plus joint reinforcement, were constructed and tested in this study. Test results demonstrated that the single grouted wall failed in a low ductility shear-dominated mode, while the modified design details resulted in a change to the high ductility shear failure mode. Results of nonlinear static and incremental dynamic analyses showed that using the proposed enhanced detail can significantly improve the seismic performance of ordinary PG masonry compared with the conventional design detail.
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Acknowledgments
This project is supported by a grant from the National Science Foundation (NSF) grant No. 1208208. The support of The Anchor Block Company (Matt Strand), which donated all of the concrete block, Harris Rebar (Kent Swanson, Pete Fosnough, and Dan Yerks), which donated the reinforcing bar, Hohmann & Barnard Inc. (Ron Hohmann), which donated the ladder-type joint reinforcement, Spec Mix (Brian Carney and Brian DiGrado), which provided the grout and mortar mixes at discount, HILTI (Christopher Gamache), which donated epoxy for the installation of starter bars, and the Bricklayers and Associated Craftworkers (BAC) Local 1 (Mike Cook and Joe Vanek), who built the masonry specimens at no cost, are gratefully acknowledged. In addition, the National Concrete Masonry Association (Jason Thompson) is thanked for its financial support of this project. The results, opinions, and conclusions expressed in this paper are solely those of the authors and do not necessarily reflect those of the sponsoring organizations.
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 13, 2015
Accepted: Jun 8, 2016
Published online: Jul 22, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 22, 2016
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