면내 압축력을 받는 플랫 플레이트 슬래브에 대한 모멘트 증대법

Abstract

This paper presents a numerical study for developing the moment magnifier method that is applicable to RC flat plates subject to combined axial compressive and floor load. For the nonlinear finite element analysis, a computer program addressing material and geometric nonlinearites was developed. The flat plates to be studied are designed in accordance with the Direct Design Method in Korean Building Code for Structural concrete. This paper proposes the buckling force and the moment magnification factor for the flat plate under the governing load condition that is the combined vertical and subsequently applied uniaxial compressive load. The buckling force is defined with two ingredients: the buckling coefficient and the effective flexural rigidity. Parametric studies are performed to investigate variations of the buckling coefficient and the effective flexural rigidity. Based on the numerical results, this pape provides the design values for the moment magnifier method.