American Society of Civil Engineers

Midply Wood Shear Wall System: Performance in Dynamic Testing

by Erol Varoglu, (Chf. Scientist, Intelligent Solutions, 4030 West 10th Ave., Vancouver BC, Canada V6R 2H1), Erol Karacabeyli, (corresponding author), M.ASCE, (Manager, Bldg. Systems Dept., Forintek Canada Corp., 2665 East Mall, Vancouver BC, Canada V6T 1W5 E-mail:, Siegfried Stiemer, (Prof., Dept. of Civ. Engrg., Univ. of British Columbia, Vancouver BC, Canada V6T 1Z4), Chun Ni, (Scientist, Bldg. Systems Dept., Forintek Canada Corp., 2665 East Mall, Vancouver BC, Canada V6T 1W5), Marlen Buitelaar, (Struct. Engr., 337 Ewen Ave., New Westminster BC, Canada V3M 5B4), and Dan Lungu, (Sr. Proj. Engr., CanStruct Engrg. Group, 201-14439 104th Ave., Surrey BC, Canada V3R 1M1)

Journal of Structural Engineering, Vol. 133, No. 7, July 2007, pp. 1035-1042, (doi:

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Document type: Journal Paper
Abstract: The midply shear wall system is a new concept in shear wall design. Test results presented here demonstrate that midply walls have superior survival characteristics under earthquake loading, and have a dynamic load-carrying capacity of more than two and a half times that of comparable standard shear walls. To prevent brittle failure at the end studs due to high-tension forces, steel rods are used at each end of the midply wall in lieu of hold-down connectors. Seismic damage accumulation was identified experimentally for the first time in wood shear walls under repeated earthquake loading. Further understanding of this phenomenon is important for seismic safety evaluation of buildings which experience multiple earthquakes during their service life. This study and the previous work on the static and cyclic performance of midply walls provide design engineers with experimental and conceptual evidence of the suitability of midply walls in wood construction applications where the architecture requires superior shear resistance.

ASCE Subject Headings:
Cyclic tests
Data analysis
Dynamic tests
Seismic effects
Seismic tests
Shear walls
Wood structures