Recently certain progress has been made on the study of concrete-filled square steel tubular (CFST). Based on a quantity of theoretical research and engineering practice, technical specifications have been implemented for designers in many districts. However, little research data has been attained on the study of special-shaped column of CFST. A new special-shaped column type——the crisscross section column composed of CFST is put forward in this paper. Advanced research has been done on the mec...