Behavior of gypsum-sheathed cold-formed steel wall stud panels Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/c247dw591

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  • This study consists of three parts: 1) Part A: Limiting Height Evaluation for Composite Wall Tests, 2) Part B: Mid-Span Deflection Evaluation for Composite Wall Tests, and 3) Part C: Nominal Axial Strength Evaluation for Wall-Braced Wall Stud Columns. The purpose of Part A is to develop experimentally-based limiting heights for interior, nonload-bearing wall panels. Lateral load is applied perpendicular to the gypsum board sheathing over the entire panel. Testing for the composite wall tests complies with ICBO ES AC86 and ASTM E 72-80 using a uniform, vacuum chamber loading on vertical 4-foot-wide specimens. Limiting heights for specific deflection limits are developed over the range of typical design loads. The test specimens for Part B are the same wall panels used in Part A. The panels are treated as simply supported beams for the analysis. The objective of Part B is to properly reflect the influence of the following factors in the calculation of mid-span deflection for the panel: connection slip, local buckling, perforations in the stud web, and effects from joints in the sheathing. Predicted deflections based on an upper bound for connection rigidity were closest to experimental deflections. The objective of Part C is to evaluate the axial strength of composite wall stud panels. The panels are similar to those of Part A except the studs are load-bearing and an axial load is applied to the centroid of the gross cross section, and no lateral loads are applied. The bracing effect from wallboard and fasteners is represented by continuous elastic springs over the length of the column. The column is subject to flexural buckling and torsional-flexural buckling. Using 1) the differential equation of equilibrium, and 2) an energy method, the flexural and torsional-flexural buckling loads are evaluated. Equations to determine the buckling loads are developed considering typical end-conditions. Local buckling effects and nominal buckling stress are determined according to 1986 and 1996 AISI specifications. Predictions and observed strengths from the limited experimental database were in good agreement. The predictions accurately represent the overall torsional-flexural buckling failure for the gypsum board-braced wall studs and its independence of stud spacing.
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