Contribution of Type-X Gypsum Wall Board to the Racking Performance of Light-Frame Wood Shear Walls
Publication: Journal of Structural Engineering
Volume 142, Issue 5
Abstract
This paper presents an experimental investigation of the racking performance of light-frame wood shear walls to evaluate the effect of Type X gypsum wall board (GWB). Twelve shear walls sheathed with oriented strand board (OSB) alone, GWB alone, or in combination were tested under static monotonic or reversed cyclic lateral load. The racking performance of these wall specimens in terms of stiffness, strength, ultimate displacement, ductility, energy dissipation, and failure modes was investigated. Specifically the effects of panel orientation, GWB panel joint taping, and double-layer GWB were examined. It was found that shear walls sheathed with GWB provide ductility ratios similar to or higher than those of OSB sheathed walls. The direct superposition rule can be applied to estimate the overall strength of a shear wall sheathed with single-layer OSB and GWB on opposite faces, provided there is no panel joint taping and the panel orientation is the same for both materials. The superposition rule proposed in current United States standards provides a conservative estimate for other cases considered in this study. In addition, shear walls with two GWB panels jointed by taping and double-layer GWB panels behaved like shear walls sheathed with a single large-size panel, leading to a reduction in the system ductility ratio and corresponding seismic force modification factor. This test series have provided essential test data for future modeling work to investigate the seismic response analysis of light wood-frame buildings containing Type X GWB.
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Acknowledgments
The authors greatly acknowledge the financial support provided by Natural Sciences and Engineering Research Council (NSERC) of Canada under the Strategic Research Network on Innovative Wood Products and Building Systems (NEWBuildS). The technical advice from Dr. Chun Ni and Dr. Mohammad Mohammad from FPInnovations have contributed greatly to this study.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 5 • May 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 24, 2015
Accepted: Nov 3, 2015
Published online: Jan 11, 2016
Published in print: May 1, 2016
Discussion open until: Jun 11, 2016
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