Experimental Research on the Performance of Micro-expansion and Self-compacting Concrete-Filled Steel Tubular Short Column under Axial Compression

Five specimens had been tested under axial compression, whose deformation and stress performance is mainly focused on both theory and experiment. The working mechanism had been analyzed on experimental results. Furthermore, some testing phenomenon was explained based on damage mechanics theory. In addition, the calculating equation for ultimate load-carrying capacity, which is reduced by the theory of hooping strengthening, has been proved to be suited and safe for this kind of structure. The research results offer the theoretical and experimental references for engineering practice of concrete-filled steel tubular structure and design index of core concrete.