Numerical simulation of hollow-core FRP-concrete-steel column subjected to the combined collision and blast loads

Hollow-core fiber-reinforced polymer-concrete-steel (HC-FCS) column is emerging as a viable option as the bridge pier that has excellent structural performance and superior corrosion resistance. Although the HC-FCS column exhibits superb resilience under the separate collision or blast load, its behavior under the combined collision and blast (C-C-B) loads has not been studied. In this study, extensive numerical studies were performed to investigate the dynamic behavior of HC-FCS column against the C-C-B loads. Refined numerical models were established and their accuracies were validated against the existing test data. Afterwards, the dynamic responses of HC-FCS column against the separate collision, separate blast, as well as the C-C-B loads were studied. The damage patterns, the impact force (F) and deflection (D)-time histories, the bending moment (BM) and shear force (SF)-time histories were recorded and analyzed. The simulation results indicate that the HC-FCS column experiences more severe damage and larger residual deflection when subjected to the C-C-B loads, but it still exhibits in a highly ductile manner. Furthermore, the influences of main variables on the dynamic responses of HC-FCS column subjected to the C-C-B loads were investigated through parametric studies. Finally, the damage of HC-FCS column with different loading scenarios were quantitively evaluated and discussed.