Strength and Seismic Performance Factors of Posttensioned Masonry Walls
Publication: Journal of Structural Engineering
Volume 141, Issue 11
Abstract
In this study, the behavior of posttensioned masonry walls is investigated using a database of 31 tested walls. The accuracy of the current Masonry Standards Joint Committee (MSJC) in evaluating the strength of posttensioned masonry walls is studied using the available test results. Moreover, using the experimental results, the seismic performance factors including ductility, response modification factor, and displacement amplification factor are determined for different types of walls including fully grouted, partially grouted, ungrouted walls, walls with confinement plates, walls with supplemental mild steel, and walls with an opening. As a result of this study, it was determined that the MSJC underestimates the strength of fully grouted unbonded posttensioned walls by about 20%. Using the strain compatibility method to determine the flexural capacity of bonded masonry walls resulted in reasonable predictions of strength. Moreover, an average response modification factor of 4.27 to 7.76 and displacement amplification factor of 3.5 are estimated for posttensioned fully grouted masonry walls. The ductility and response modification factor for ungrouted and partially grouted walls and walls with an opening were much lower than those of fully grouted walls. It was found that the -factor of partially grouted walls can be estimated by linear interpolation between the -factors of ungrouted and fully grouted walls. This study also concluded that the axial stress ratio has a prominent effect on the ductility of posttensioned masonry walls. To provide a ductile response, based on the findings, it is recommended to limit the axial stress ratio to a value of 0.15.
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Acknowledgments
The authors gratefully acknowledge the support of Australian Building Code Board (ABCB) and the University of South Australia for granting the scholarship to the first author that allowed this work to be undertaken.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Apr 1, 2014
Accepted: Jan 7, 2015
Published online: Mar 6, 2015
Discussion open until: Aug 6, 2015
Published in print: Nov 1, 2015
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