Abstract: The numerical model of steel-reinforced concrete-filled steel tubular composite members under transverse impact load was established in ABAQUS, and the correctness of the model was verified through previous transverse impact tests. The effect of three different profiled steel on the transverse impact performance of concrete-filled steel tubular (CFST) members were compared. The mid-span deflection, impact force and sectional moment of the composite members during impact were analyzed, and the influence of parameters of profiled steel on the impact resistance of specimens was discussed. The results demonstrate that the overall deformation of the CFST members under the transverse impact load can be reduced by reinforcing the section steel, and impact resistance of the membersincreases. When the profiled steel ratio is same, the composite specimens with I-shaped profiled steel have the best impact resistance. The profiled section form has a significant influence on the bending moment distribution of composite members. When the profiled steel ratio remains constant, the impact resistance of the specimen gradually increases with the increase of the profiled steel web height, and the outspread section form of the profiled steel is more favorable for impact resistance. The distribution position of the angle steel has a certain influence on the impact resistance of the specimen, and the impact resistance increase with the profiled steel ratio.

Key words: steel-reinforced concrete-filled steel tube, transverse impact, finite element analysis, impact process, parametric analysis