Seismic Performance Parameters for Reinforced Concrete-Block Shear Wall Construction
Publication: Journal of Performance of Constructed Facilities
Volume 24, Issue 1
Abstract
The focus of the current study is to analyze previously reported test results to evaluate equivalent plastic hinge lengths for concrete-block shear walls and to extract related seismic performance parameters. Inelastic curvatures at the base of the walls are the main source of plastic deformation for flexurally dominated walls. With adequate estimation of the plastic hinge length and more realistic values for inelastic curvatures at the base of the wall, top wall displacement can be predicted more accurately. For the walls analyzed, measured compressive strains close to the base of the wall at maximum load were significantly higher than the strains specified by North American codes. The strains, although may not alter the wall strength, significantly affect the displacement ductility at maximum load. The analysis showed that the equivalent plastic hinge length varied between approximately 30 and 60% of the wall length at a drift of 1%. The product of the seismic force modification factors (for ductility and overstrength) varied between 3 and 6. The plastic hinge length and the seismic force modification factors were found to depend not only on the factors prescribed in North American codes but on the amount of vertical reinforcement and axial stress level as well. This study draws a road map for further research to facilitate better understanding and provide more realistic methods to predict the seismic performance of masonry shear wall construction.
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Acknowledgments
This study forms a part of ongoing masonry research 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). This research falls under CEDS Focus Area I: Masonry Structures, and CEDS Focus Area: Earthquake Engineering. The financial support of the Centre is gratefully appreciated. Provision of mason time by Ontario Masonry Contractors Association (OMCA) and Canada Masonry Design Centre (CMDC) is appreciated. The supply of the concrete blocks and grout by Boehmer Block Ltd. is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 24 • Issue 1 • February 2010
Pages: 4 - 18
Copyright
© 2010 ASCE.
History
Received: Jan 30, 2009
Accepted: Jun 3, 2009
Published online: Jun 5, 2009
Published in print: Feb 2010
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