Abstract
To study the contribution of concrete in the tubes to the torsional stiffness of concrete-filled steel tube (CFST) members, torsion tests of five groups of CFST members and corresponding hollow steel tube members were performed, and the finite element model was verified based on the different steel ratios and diameter-to-thickness ratios. The test results show that the hollow steel tubes will be destroyed due to plastic hinges, but the CFST members have no obvious buckling phenomenon. The parameter analysis was carried out by finite element analysis (FEA), which considered steel ratio, steel yield strength, and concrete strength. The results show that the steel ratio greatly influences the torsional stiffness of CFSTs, while the concrete strength and steel strength have minimal effect on the torsional stiffness. Finally, considering the contribution of the concrete in the steel tubes to the torsional stiffness, the superposition method of linear stiffness was used to determine the regression formula of the torsional stiffness coefficient of concrete.
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