This paper presents an analytical study on local buckling of steel faceplates in concrete-filled composite plate shear walls (C-PSW/CF). To analyze steel faceplate buckling, concrete infill was considered to be a rigid, tensionless (unilateral) support and shear anchors and tie bars were considered to be point braces. A classical, differential equation, eigenvalue buckling analysis cannot directly solve a buckling problem with a unilateral support. Therefore, an iterative method of solving the unilateral buckling problem with a classical, differential equation, eigenvalue approach was developed and used to study buckling of steel faceplates. The buckling study considered the number of anchor points over the wall height and the unilateral buckling analysis directly incorporated the effects of bracing stiffness. A minimum brace stiffness was found which prevented buckling of the entire faceplate away from the concrete infill; however, a greater brace stiffness was required to develop the faceplate yield strength. Considering an initial out-of-straightness in the steel faceplate, a dual strength and stiffness requirement for tie bars and shear anchors to develop the yield strength of the faceplate in C-PSW/CF was developed. The proposed requirement would accompany the existing design requirements for tie bars and/or shear connectors.
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