Graduate Thesis Or Dissertation
 

The performance of wood frame shear walls under earthquake loads

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2v23vx05p

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  • The overall goal of this study is to evaluate the earthquake performance of wood frame shear walls, and more specifically: (1) to compare the performance differences of fully and partially anchored walls under monotonic, cyclic, and earthquake loads, (2) to compare wall performance under earthquake loads with that of standardized monotonic and cyclic loads, (3) to evaluate earthquake performance of walls with respect to code measures, (4) to attain insight into the earthquake performance of walls carrying vertical load, and to compare this performance with that of walls without vertical load, and (5) to get a preliminary understanding of the performance of walls subjected to a sequence of earthquakes, and to compare this performance with that of walls subjected to a single earthquake. Earthquake tests were conducted on 2440x2440 mm walls with 38x89 mm Douglas-fir studs 610 mm on center. Two 1220x2440x11.1 mm oriented strand board (OSB) panels were installed and fastened vertically to the frame with 8d nails (2.87x60.33 mm) 152 mm and 305 mm on center along panel edges and intermediate studs, respectively. Two 12.7 mm gypsum wallboard (GWB) panels were installed vertically on the face opposite the OSB. Partially anchored walls had two 12.7 mm A307 anchor bolts installed 305 mm inward on the sill plate from each end of the wall. In addition to these anchor bolts, fully anchored walls included holddowns installed at the end studs of the wall and were attached to the foundation with 15.9 mm Grade 5 anchor bolts. Four historical ground motion time histories were used for earthquake tests, three of these were subduction zone ground motions, and the fourth had a strike-slip fault mechanism. Ground motions were scaled to the 10% in 50 year probability of exceedance design level for the Seattle, WA area, with a 4545 kg seismic mass. Thirty-four earthquake tests were conducted and split evenly between fully and partially anchored walls. Monotanic and cyclic tests were conducted in Phase I of this project by Seaders (2004).
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