Test Report on Cold-Formed Steel Shear Walls
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The objective of report is to detail recent cyclic tests on cold-formed steel (CFS) framed shear walls sheathed with Oriented Strand Board (OSB). The tests details are motivated from shear walls designed for a two-story ledger-framed building that will undergo full-scale shake table testing as part of the National Science Foundation funded Network for Earthquake Engineering Simulation (NEES) project: CFS-NEES (www.ce.jhu.edu/bschafer/cfsnees). Monotonic and cyclic (CUREE protocol) tests are conducted on 4 ft?9 ft (1.22m?2.74 m) and 8 ft?9 ft (2.44m?2.74 m) shear walls utilizing 54 mil (1.37mm) back-to-back chord studs and 7/16 in. (11.1 mm) OSB sheathing on the exterior. Practical building details studied in the shear wall tests include the impact of (a) ledger track, which is attached to the top of the interior face of the wall, (b) gypsum, which is attached to the interior face of the wall below the ledger track, (c) locations of panel seams, both horizontal and vertical in the OSB, and (d) the impact of differing stud thickness and grade for the field studs. The information will be used to assess current design procedures utilizing AISI-S213-07 and to develop nonlinear (hysteretic) models of the shear walls in the CFS-NEES model building so that full building system performance can be assessed.