EXPERIMENTAL STUDY AND FINITE ELEMENT ANALYSIS OF IMPACT RESISTANCE OF NOVEL COMPOSITE COLUMNS

In order to improve the impact resistance of structural columns and propose optimal section form, impact resistance tests were performed for novel composite columns with different cross sections. The experiments were performed on the DHR-9401 drop hammer test machine. Three widely used nonlinear dynamic finite element software (i.e., MSC.Marc, ABAQUS and ANSYS/LS-DYNA) were adopted to simulate the impact experiments. Experimental results show that the composite columns have good impact resistances. For the specimens with the identical outside diameter and steel ratio, the concrete filled double skin steel tubes columns have the best impact resistance, followed by the hollow concrete filled steel columns and the concrete filled steel tube column with double H-shaped steel. In addition, among the simulated results, ABAQUS have the best agreement with the experiment results, followed by MSC.Marc and ANSYS/LS-DYNA. These observations can assist in providing suggestions for choosing the best section form of new large railway stations, and offering references for selecting suitable finite element software for impact resistance analysis.