Experimental Investigation of Axial Load and Detailing Effects on the Inelastic Response of Reinforced-Concrete Masonry Structural Walls with Boundary Elements
Publication: Journal of Structural Engineering
Volume 146, Issue 12
Abstract
In typical wall load-bearing reinforced-masonry (RM) buildings, the lateral and vertical forces are resisted by rectangular shear walls. Thus, the walls are subjected to high vertical forces from gravity loads that are expected to limit the displacement and energy dissipation capacities. Moreover, the rectangular RM shear walls have limited lateral stability because of the single vertical reinforcement layer. The intent of this study is to investigate the inelastic cyclic response of RM structural walls subjected to axial compressive stress that results in precompression ratios, , higher than 10%. The main objective is to propose practical component-level seismic detailing recommendations to enhance the overall structural performance. In this respect, three half-scale, fully grouted RM shear walls were tested under constant axial load, in-plane fully reversed cyclic loading, and top moment. The tested specimens are flexural dominant to simulate the response of mid and high-rise RM shear walls under strong seismic actions. The walls were designed to have enlarged boundary elements built using C-shaped blocks to evaluate the ability of end zone detailing and confinement to alleviate the impact of the high axial load. The test results demonstrated an overall enhanced structural performance for the three walls. The three specimens attained high ductility levels, high energy dissipation capacity, and failure in the ductile flexural mode. The presence of the well-detailed and confined boundary elements was effective in mitigating the impact of the high axial compression load. Thus, utilizing this type of masonry shear wall increases the competitiveness of masonry buildings as an alternative construction method.
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Data Availability Statement
The experimental data generated in this study are available from the authors by request.
Acknowledgments
The authors acknowledge support from the Natural Sciences and Engineering Research Council of Canada (NSERC), l’Association des Entrepreneurs en Maçonnerie du Québec (AEMQ), the Canadian Concrete Masonry Producers Association (CCMPA), and Canada Masonry Design Centre (CMDC).
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© 2020 American Society of Civil Engineers.
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Received: Jul 20, 2019
Accepted: Jun 24, 2020
Published online: Sep 20, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 20, 2021
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