Performance of partially and fully anchored wood frame shear walls under monotonic, cyclic and earthquake loads Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6t053j193

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  • The objectives of this study were to evaluate the performance of wood frame shear walls under monotonic, cyclic and earthquake loads by: (1) estimating the variability of shear wall performance, (2) comparing the performance of walls under each loading protocol, (3) evaluating the effects of anchorage on wall performance, and (4) evaluating the performance of walls qualitatively and quantitatively with respect to code defined performance measures. Tests were conducted on 2440 x 2440 mm (8 x 8 ft) wall specimens with 38 x 89 mm (2x4) Douglas-fir studs at 610 mm (24 in) on center. Two 1220x2440x11 .1 mm (48x96x7116 in.) structural oriented strand board (OSB) panels were installed vertically and fastened with 8d nails (0.113x2.375 in.; 2.87x60.33 mm) at 152 mm (6 in.) on center around the edges of the panels and at 305 mm (12 in.) on center in the panel fields. Two 12.7 mm (0.5 in.) gypsum wallboard (GWB) panels were installed vertically on the face of the wall opposite the structural panel sheathing. Partially anchored walls were connected using two 12.7 mm (0.5 in) A307 anchor bolts installed at 305 mm (12 in.) from each end of the specimen. Fully anchored walls were constructed identical to partially anchored walls except that SIMPSON Strong-Tie® PHD-2A hold-downs were installed at the ends of the wall and connected with 15.9 mm (0.625 in.) Grade 5 anchor bolts. Sets of tests consisting of eight partially anchored walls and two fully anchored walls were conducted using the ASTM E564 monotonic protocol and CUREE cyclic test protocol for ordinary ground motions for a total of twenty walls. Eight walls were tested using two historical subduction zone ground motions scaled to a 10% in 50 year probability of exceedence for the Seattle area, with a 4545 kg (10,020 Ib) seismic mass. Two partially anchored and two fully anchored walls were tested using each earthquake time history.
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