Quasi static behavior of specially shaped columns composed of concrete-filled steel tube frame-double steel concrete composite walls

Abstract

This paper proposes a new structure suitable for high-rise buildings that combines specially shaped columns composed of concrete-filled steel tube (SCFST) frames and double steel concrete (DSC) composite walls. To investigate the quasi-static behavior of the structure, three 1:2 specimens with two stories were tested. The failure modes and effects of the form of boundary elements on the behavior of the structure were studied. The experimental results indicate that the structure exhibits good hysteretic behavior, energy dissipation capacity, and ductility. The form of boundary elements has a significant influence on the quasi-static behavior of the structure. A finite element analysis model with the function of deleting failure elements was proposed based on the experimental results. The analysis of the model shows that the aspect ratio, thickness of the steel plate, and form of the boundary element have a significant influence on the lateral bearing capacity and deformation of the structure, whereas the axial compression ratio has less influence. A skeleton curve model was proposed based on the finite element analysis results.