THE INFLUENCE OF AXIAL COMPRESSION RATIO ON THE LATERAL IMPACT PERFORMANCE OF CONCRETE FILLED STEEL TUBE COLUMNS

To study the influence of different axial compression ratios on the lateral impact performance of concrete-filled steel tube columns, the existing impact tests were verified in this paper. Based on the verification model, the dynamic finite element models of concrete-filled steel tubular columns with different axial compression ratios under lateral impact were established. The impact resistance parameters of the concrete-filled steel tubular columns with different axial compression ratios were calculated. The results show that the axial compression ratio has a significant effect on the lateral impact resistance of concrete-filled steel tubes. When the axial compression ratio is less than 0.7, the axial force increases the lateral impact resistance of concrete-filled steel tubular members; when the axial compression ratio is greater than 0.7, the axial force decreases the lateral impact resistance of concrete-filled steel tubular members.