| A group of six full-size 550MPa high strength cold-formed steel framing wall studs with single steel rib panel were tested under axial compression loading. The ultimate load-carrying capacity and failure modes of all wall studs were obtained from the test. Also, it was found from the test that flexural-torsional buckling is the main failure mode of the wall studs. During the test, distortional bucking occurred in all the wall studs and the interaction between local and distortional bucking happened.Based on the test, the finite element program ANSYS is applied to carry out the finite element nonlinear analysis of the framing wall studs with single steel rib panel under axial compression loading. Ultimate load-carrying capacity of the finite element method agrees well with the test data. In order to fully understand the behavior of the framing wall studs with single panel, a detailed parametric study, including the type of panels, the spacing of screws, the plate strips, the seam construction of steel rib panel and the section size of wall studs, is analyzed in the paper.Effective length factorμ_x is obtained based on ultimate load-carrying capacity and failure modes of the wall studs with single steel rib panel. In order to be applied to project design, the values of effective length factorμ_x are suggested. Also, a new method of calculating ultimate load-carrying capacity of the wall studs is provided. Based on the comparing the calculated load-carrying capacity of the wall studs by use of the new method and the suggested values ofμ_x with the test results, it shows that the suggested method for calculating the load-carrying capacity of the wall studs with single steel rib panel is feasible and valid.
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