Experimental Assessment of the System-Level Seismic Performance of an Asymmetrical Reinforced Concrete Block–Wall Building with Boundary Elements
Publication: Journal of Structural Engineering
Volume 143, Issue 8
Abstract
Using boundary elements in reinforced masonry (RM) walls allows closed ties to be used and multiple layers of vertical bars to be accommodated, thus providing a confining reinforcement cage. This enhances the overall performance of the RM wall relative to conventional RM wall with rectangular cross sections, which typically have a single-leg horizontal reinforcement and a single layer of vertical reinforcement. In addition, with the expected shift of design code developers’ focus from the component-level to the system-level assessment of seismic force resisting systems (SFRS), there is a need to experimentally quantify the system-level performance of RM buildings. To address this, an experimental asymmetrical two-story reduced-scale RM shear wall building with boundary elements, referred to as “Building IV,” was tested to failure under reversed cyclic loading that simulates seismic demands. Building IV was designed to have the same lateral resistance as a previously tested RM shear wall building with conventional rectangular configuration (without boundary elements), referred to as “Building III,” to allow for direct comparison. Therefore, after a brief summary of the experimental program, the focus of this paper is to compare the damage sequence and the load-displacement hysteretic behavior between the two buildings. The results show that higher levels of ductility accompanied by relatively smaller strength degradation were achieved during the test of Building IV compared to that of Building III. This study enlarges the database of system-level experimental results in an effort to facilitate the adoption of RM shear walls with boundary elements as a SFRS category within the next editions of the American and the Canadian masonry design standards.
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Acknowledgments
The financial support for this project was provided through the Natural Sciences and Engineering Research Council (NSERC) of Canada. Support was also provided by the McMaster University Centre for Effective Design of Structures (CEDS), funded through the Ontario Research and Development Challenge Fund (ORDCF) of the Ministry of Research and Innovation (MRI). Provision of mason time by the Ontario Masonry Contractors Association (OMCA) and the Canada Masonry Design Centre (CMDC) is appreciated. The provision of the scaled blocks through a grant from the Canadian Concrete Masonry Producers Association (CCMPA) is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 8 • August 2017
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©2017 American Society of Civil Engineers.
History
Received: Dec 22, 2015
Accepted: Dec 21, 2016
Published online: Mar 20, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 20, 2017
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