Characterizing the In-Plane Rocking Response of Masonry Walls with Unbonded Posttensioning
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
Unlike the use of bonded reinforcement to anchor a masonry wall to its foundation, the use of unbonded posttensioning may result in a controlled rocking response of the wall. Considering that conventional analysis techniques routinely employed for monolithic structures are inadequate to describe a controlled rocking response, this paper introduces analysis methods that are able to predict the monotonic force-displacement responses of masonry walls with unbonded posttensioning. These methods include (1) an iterative procedure that employs sectional analysis and accounts for the confinement effects attributable to lateral friction at the wall-to-foundation interface and (2) a simplified procedure that is based on equivalent stress block analysis. The two methods are compared against experimental data from three past research studies, and high-fidelity finite-element models are used to verify predictions of the wall responses, including the neutral axis depth (NAD) at the wall-to-foundation interface. Comparisons show the proposed analysis methods to adequately capture the experimental force-displacement responses and produce NAD variations that agree well with the finite-element models.
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Acknowledgments
The authors are indebted to the Department of Civil, Environmental, and Geo-Engineering at the University of Minnesota–Twin Cities for financially supporting the first author with a Departmental fellowship. The authors would also like to thank Peter Laursen, Associate Professor at the California Polytechnic State University, and Jason Ingham, Professor at the University of Auckland, for providing the experimental data used to validate the presented finite-element models. Finally, the authors are grateful for the support provided by the Office of the Vice President for Research at the University of Minnesota, Twin Cities, through a Grant-in-Aid of Research, Artistry, and Scholarship.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 25, 2016
Accepted: Mar 7, 2017
Published online: Jun 13, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 13, 2017
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