Effects of reference displacement and damage accumulation in wood shear walls subjected to the CUREE protocol Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s4655m61p

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  • The objectives of this study are: (1) to evaluate the effect of reference displacement on wall behavior under fully reversed cyclic loading using the CUREE test protocol and (2) to assess damage accumulation (visible fastener damage and stiffness degradation) for the imposed drift levels. All tests were conducted on identical 2440 x 2440 mm (8 x 8 ft) wall specimens constructed of Douglas-Fir studs and oriented strand board (OSB) panels. Sheathing was fastened to the framing with pneumatically driven, SENCO® annular ring shank nails. The CUREE (Consortium of Universities for Research in Earthquake Engineering) cyclic test protocol for ordinary ground motions was employed as a means to study the racking response of the wood shear walls. Four sets of tests, each consisting of two wall specimens, were conducted using four different reference displacements. Results show that reference displacement can influence wall strength by up to 15% while there was little or no effect on stiffness and area under the backbone curve. A trend of increasing strength and ultimate displacement with increased reference displacement was observed for the first three sets of tests. It was found however that this trend did not hold true for the fourth set of tests with the largest reference displacement. Additional tests using a segmented version of the CUREE protocol provided a way to correlate visible damage and stifthess degradation to imposed drifts. Results show that while visible damage was minimal at drifts as high as 1%, (8% of nails slightly damaged), a 52% reduction in secant stifthess had occurred. In general, it was observed that significant softening of the wall could occur with only minimal signs of visible damage to the sheathing fasteners.
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