EXPERIMENTAL STUDY ON THE LOAD-DEFORMATION CHARACTERISTICS OF CONCRETE FILLED CIRCULAR STEEL TUBE SHORT COLUMNS UNDER AXIAL COMPRESSION CONSIDERING SIZE EFFECT

Abstract

Behavior of a circular concrete-filled steel tube (CFT) short columns under axial compression is influenced by the interactive effects between steel and concrete. This paper first derives the constitutive equations of the concrete considering the triaxial stress state under the incremental lateral stresses. Second, the numerical formulas for predicting stress-strain behavior of steel tube are proposed based on the experimental results. By using the obtained numerical formulas, the loaddeformation behavior of a circular CFT short column under uniaxial compression is predicted, considering the size effect.