Abstract:In order to study the influence of wall thickness on the dynamic splitting tensile properties of concrete-filled FRP tubes, a 74 diameter split Hopkinson pressure bar system was used to carry out a dynamic impact test of concrete-filled FRP tubes. The dynamic characteristics of concrete-filled FRP tubes under different loading rates were obtained by changing the impact pressure. At the same time, the wall thickness of 2mm, 3mm, 4mm, 5mm was set, and the longitudinal analysis under the variable was carried out. The results show that under the confinement of the FRP tube, the dynamic stress-strain curve appears "double peak", and the second peak is higher than the first. Through the SHPB test, it is found that with the increase of wall thickness, the slope of dynamic strength impact velocity fitting line decreases, and the strain rate effect weakens. In the aspect of failure mode, there is only one through crack under the impact pressure of 0.4 ~0.5 MPa. With the increase of impact pressure, the local fracture of the loading surface begins to appear, but the specimen still presents complete shape.