Unbonded Post-Tensioned Structural Masonry Wall with Rubber Interface for Limited-Damage Systems
Publication: Journal of Structural Engineering
Volume 148, Issue 1
Abstract
Unbonded post-tensioned (UPT) tendons have been used in structural masonry walls to enhance the self-centering capability of the walls. However, the lateral displacement capacity of masonry walls with UPT tendons can be compromised by early crushing of the compression toes. To prevent toe crushing, this research study employed rubber pads underneath the bottom corners of a full-scale one-story wall. This concept was investigated by subjecting the wall sequentially to free vibration and quasistatic tests, which minimized damage to the masonry and reduced the strength degradation of the wall with increasing lateral drift. Two major damping components were identified: one is due to the instantaneous impact of the wall on the foundation base, and the other is due to the inelastic action occurring within the rubber pads during the continuous phase of rocking motion. Using the test results, a procedure is presented for designing masonry walls with rubber pads and UPT tendons.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge Fabreeka International Inc. and their test engineer, Matthew Pladsen, for donating the rubber layers; the Advance Shoring Co. at Minnesota for donating the steel form-work for the foundation and top beam used in the tests; the Cement Masons Association for supervising casting of the concrete mix into the form-works; AMCON Concrete Products, LLC for donating the concrete masonry units; TCC Materials in Saint Paul for donating the grout and mortar materials; and the Bricklayers and Allied Craftworkers Association for donating their time at no cost to construct the masonry wall.
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© 2021 American Society of Civil Engineers.
History
Received: Sep 21, 2020
Accepted: Jun 18, 2021
Published online: Oct 18, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 18, 2022
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