Abstract
The article presents the derivation of the resolving equations for calculating concrete filled steel tubular columns with an annular cross-section under central compression, taking into account physical nonlinearity. The solution is performed numerically by the finite difference method. The deformation theory of plasticity of concrete by G.A. Geniev is used as the law of deformation
Highlights
Compared to traditional reinforced concrete elements, concrete filled steel tubular (CFST) columns have a number of significant advantages, but at the same time they have disadvantages, one of which is the lack of a generally accepted methods for calculating the bearing capacity of CFST columns taking into account the effect of lateral compression of concrete
Another significant disadvantage of CFST columns is the violation of joint operation in the transverse direction between concrete and a steel shell in the elastic stage due to the higher Poisson's ratio of steel
Lateral compression prestresses are created in the concrete core
Summary
Compared to traditional reinforced concrete elements, concrete filled steel tubular (CFST) columns have a number of significant advantages, but at the same time they have disadvantages, one of which is the lack of a generally accepted methods for calculating the bearing capacity of CFST columns taking into account the effect of lateral compression of concrete. Another significant disadvantage of CFST columns is the violation of joint operation in the transverse direction between concrete and a steel shell in the elastic stage due to the higher Poisson's ratio of steel. The papers [1,2,3,4,5] present methods for calculating such columns, but they contain empirical coefficients, which limits the possibility of their application for new concrete compositions, other materials of shell, etc
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