Seismic Response Modification Factors for Reinforced Masonry Structural Walls
Publication: Journal of Performance of Constructed Facilities
Volume 25, Issue 2
Abstract
The current North American design standards provide seismic force modification factors for the rectangular masonry structural walls category only; no similar provisions for flanged and end-confined masonry structural walls exist. This study demonstrates that seismic force reduction factor () values calculated for rectangular walls was close to 5.0, which is consistent with the value stipulated by the ASCE 7, and was 36 and 90% higher for the corresponding flanged and end-confined walls. The deflection amplification factor () values calculated for rectangular walls were higher than specified in the ASCE 7 for the special reinforced masonry wall category. Values of the ductility-related force modification factor () for flanged and end-confined walls were, respectively, at least 30 and 100% higher than those of rectangular walls specified in the National Building Code of Canada (NBCC). Quantification of the seismic response parameters within this study is expected to facilitate adoption of the flanged and end-confined wall categories in North American masonry codes as a cost-effective technique to enhance the seismic performance of masonry construction.
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Acknowledgments
This study forms a part of an ongoing research program in 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). The financial support of the Centre is greatly appreciated. The support of the National Science and Engineering Research Council (NSERC) is also acknowledged. Provision of mason time by Ontario Masonry Contractors Association (OMCA) and Canada Masonry Design Centre (CMDC) is also appreciated. The supply of half-scale blocks by the Canadian Concrete Masonry Producers Association (CCMPA) and the steel wires by Laurel-Lec-Steel is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 25 • Issue 2 • April 2011
Pages: 74 - 86
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 10, 2010
Accepted: May 1, 2010
Published online: May 27, 2010
Published in print: Apr 1, 2011
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