Study on axial compression behavior of rectangular concrete filled steel tubular columns with Perfobond Leister Ribs

Abstract

The built-in open-hole type stiffened rectangular steel tube concrete refers to a new combined structure formed by forming an open-hole steel plate in the longitudinal direction of the inner wall of the steel pipe and then filling the concrete. The PBL stiffener has the double functions of longitudinal stiffener and shear connector. In order to study the influence of stiffeners on the ultimate bearing capacity of rectangular CFST columns, the finite element model was established by ABAQUS and the parameters of the stiffeners were analyzed, including the aperture of the stiffeners, the spacing of the stiffeners and the width-thickness ratio. The results show that the finite element model established in this paper is in good agreement with the existing test data. The bearing capacity of rectangular CFST columns increases first and then decreases with the increase of the opening aperture of stiffeners, increases with the increase of the opening spacing, and increases with the decrease of the width to thickness ratio of stiffeners. The conclusions of this paper can provide some suggestions for the design of PBL stiffened rectangular CFST columns in practical engineering.