Dynamic response of SRP-reinforced precast segmental bridge columns subjected to vehicle collision

In order to reduce the vehicle impact on the precast segmental columns，the steel reinforced polymer（SRP）was used to reinforce the precast segmental columns and perform intensive numerical simulations. A numerical model of the precast segmental columns was developed using LS-DYNA，and the accuracy of the numerical simulation method was validated comparing with existing experimental data. Under the same vehicle impact conditions，the time-history curves of the impact force，the lateral displacement and the column damage of the RC columns and the SRP reinforced columns were compared and analyzed. The SRP reinforced position，the number of SRP wrapping layers and the initial prestress level were taken as variables，and their influence on the impact force of the vehicle-column collision and the deformation of the columns were studied. The results show that using SRP to rationally strengthen the precast segmental columns can effectively reduce the impact force to the columns. The lateral displacement and damage of the columns are also reduced. The use of SRP reinforcement at the column bottom and the joints has a better protective effect on the columns. Increasing the number of SRP wrapping layers from 1 to 3 can limit the displacement deformation of the columns more effectively.