ABSTRACT
To study the impact performance of concrete-filled steel tubular columns with inner steel tubes, a numerical model of drop hammer impact was established using the finite element software LS-DYNA. The structural response under different impact forces was investigated by changing the steel strength and the concrete strength. It is found that the impact resistance of concrete-filled plain steel tubular columns can be significantly improved by reasonably adding an inner steel tube. To verify the correctness of the numerical simulation method and strategy, the existing impact test of CFST is simulated, and the simulation results are in good contrast with the test results.
