Study On The Application Of Steel Plate-Rubber Concrete Composite Layer In Anti-collision Of Bridge Piers

With the development of science and economy,the beam bridge has been applied more and more generally.As the substructure of bridge,the pier bears the self-weight of bridge as well suffers the potential threat of car crash.Therefore,it is significant to study the dynamic responses of the pier under impact load and its anti-collision strategies.In this paper,the corrugated steel plate-rubber concrete,the plane steel plate-rubber concrete and the rubber concrete was applied as anti-collision layer for model piers.The impact force and dynamic responses of piers were tested by pendulum test,then the anti-collision abilities of the three different layers was investigated.In addition,with the combination of MSE method and ABAQUS/Explicit,the additional damping ratios of the model pier with different layer types were calculated,which verified the feasibility of FEM simulation in collision problem.Based on the above,the detailed conclusions can be obtained as follows:(1)For the model piers with corrugated steel plate-rubber concrete layer(PC),plane steel plate-rubber concrete layer(PP)and rubber concrete layer(PR),the displacement period at the pier top increases slightly with the growing height of hammer.(2)With the same height of hammer,the displacement at the pier top is in a descending order as PR,PP and PC.(3)The increasing law of impact force for the model piers with different layers are different.The impact force of PC can be suppressed as the result of local deformation in corrugated steel plates.(4)For PC and PP,the concrete strains are affected by local deformation in steel plates and energy dissipation in rubber concrete.The local deformation in steel plates is domainate firstly,while the energy dissipation of inner rubber concrete is highlighted after the local deformation in steel plates develops to ultimate.(5)The concrete strain of concrete surface,displacement at the pier top and accelerations of the FEM models are consistent with practical pier models,while the peak values of the former are slightly higher than the latter,which declares that it’s feasible to explore the dynamic responses of the pier under impact load with ABAQUS.For the perspective of the security of pier,the FEM simulation is conservative.(6)The steel plates serve as formworks and improving the lateral stiffness of pier.Especially for PC,the vertical corrugation increases the mechanical interlocking between the steel plates and rubber concrete as well enhancing the lateral performance.Therefore,it is satisfying to combine the corrugated steel plates or plane steel plates with rubber concrete as the anti-collision layer on pier.