Abstract
The performance of concrete-filled high-strength steel tubes (CFHSST) under transverse impact was studied through experiments and numerical analysis in this paper. A total of 14 specimens of concrete-filled BG890QL high-strength steel tubes and 8 specimens of concrete-filled Q345B carbon steel tubes were tested using a drop hammer apparatus. Test results showed that CFHSST presents a bending failure under transverse impact and has good impact resistance. However, CFHSST with a higher axial compression or bending resistances show lower impact resistance compared to that of the concrete-filled carbon steel tubes (CFST). This may be due to the relatively lower strain rate effect and the characters of the constitutive relation of the high-strength steel. A finite element analysis (FEA) model was then established to broadly compare the impact resistance of CFHSST and CFST. The finite element analysis shows that the impact resistance of CFHSST members is higher than that of CFST members with the same axial compression resistance and static bending resistance when the impact energy is relatively low. However, with the increase of the impact energy, the impact resistance of CFHSST is gradually lower than that of CFST, showing its potential mechanical shortcomings under extreme hazards compared to the conventional CFST. Finally, based on a parametric analysis, key parameters that may influence the impact resistance of CFHSST are identified.
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