Seismic Performance Assessment of Partially Grouted, Nominally Reinforced Concrete-Masonry Structural Walls Using Shake Table Testing
Publication: Journal of Performance of Constructed Facilities
Volume 28, Issue 2
Abstract
An experimental program has been carried out to study the performance of partially grouted, nominally reinforced (PG-NR) concrete block structural walls under in-plane seismic loading on a shake table. Five reduced-scale structural walls were constructed and tested under scaled versions of the 1940 El Centro, California earthquake, using its N-S component record with a constant axial compression load that represented a single-story building. The test walls were grouped into three categories. Type I and III walls had reinforcement at the wall end cells only, with vertical reinforcement ratios of 0.07 and 0.12%, respectively, based on the gross cross-sectional area of the walls. Type II walls were similar to Type I walls, but with an additional reinforcement bar located midlength of the wall with a vertical reinforcement ratio of 0.10%, also based on the gross cross-sectional area of the wall. The experimental results were documented and discussed with respect to wall lateral load capacity, stiffness degradation, period shift, displacement ductility levels attained, and relevant seismic-force reduction factors. The test results showed that PG-NR masonry walls can comprise a ductile seismic force-resisting system. Subsequently, PG-NR masonry walls have the potential to bridge the gap between unreinforced and reinforced masonry systems. The use of PG-NR masonry also results in a reduced cost compared with traditional reinforced masonry systems used in seismic zones that are typically fully grouted within the plastic hinge zones and require higher reinforcement ratios.
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Acknowledgments
Financial support has been provided by the McMaster University Centre for Effective Design of Structures (CEDS) funded through the Ontario Research and Development Challenge Fund (ORDCF), a program of the Ministry of Research and Innovation (MRI), as well as the Natural Sciences and Engineering Research Council (NSERC) of Canada. Provision of mason time by the Canada Masonry Design Centre (CMDC) is appreciated. The supply of scaled blocks by the Canadian Concrete Masonry Producers Association (CCMPA) is gratefully acknowledged.
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Information
Published In
Journal of Performance of Constructed Facilities
Volume 28 • Issue 2 • April 2014
Pages: 216 - 227
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 19, 2012
Accepted: Oct 30, 2012
Published online: Nov 3, 2012
Published in print: Apr 1, 2014
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