I-Shaped Unreinforced Masonry Wallettes with a Soft-Layer Bed Joint: Behavior under Static-Cyclic Shear
Publication: Journal of Structural Engineering
Volume 143, Issue 11
Abstract
In order to extend the latest findings on the in-plane shear behavior of rectangular unreinforced masonry (URM) wallettes with soft-layer bed joints and gain insight into the possible influence of flanges, two series of static-cyclic shear tests on I-shaped (flanged) URM wallettes have been conducted. The wallettes were made of standard Swiss clay blocks and standard cement mortar including a rubber granulate soft layer placed in the bottom bed joint. The test results show that the flanges considerably increased the horizontal force resistance and the initial stiffness of the I-shaped wallettes compared to rectangular wallettes. Further, it appeared that the presence of a soft layer can provide for significant seismic response modification by reducing the initial stiffness and significantly increasing the displacement capacity of the I-shaped wallettes. An analytical model based on discontinuous stress fields is proposed to predict the horizontal force resistance of the I-shaped wallettes with soft-layer bed joints.
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Acknowledgments
The clay blocks and mortar were supplied free of charge by ZZ Wancor AG and Presyn AG, respectively. The soft-layer membranes were sponsored by Mageba SA. This financial support as well as the assistance of Mr. Thomas Gehrig and Mr. Walter Korner from p+f Sursee in preparing the specimens and the contribution of the Master students Mr. Jan Egeter and Mr. Patrik Schönenberger, who helped in performing the tests, are gratefully acknowledged. The principal funding for this work is provided by the Swiss National Science Foundation (SNF) through a research grant #200021_146417 and by the Swiss Federal Institute of Technology (ETH) Zurich. The findings and conclusions presented in this paper are those of the authors and are not necessarily shared by the funding agencies and/or by the sponsors.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 11 • November 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 3, 2016
Accepted: May 11, 2017
Published online: Sep 7, 2017
Published in print: Nov 1, 2017
Discussion open until: Feb 7, 2018
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