LAUSR

The residual load-bearing capacity of a reinforced concrete (RC) beam with collision damage was studied based on the loading test and theoretical analysis of the damaged beam to determine whether the damaged RC beam bridge after truck collision, could continue to be used and reveal the mechanical properties of the damaged beam. First, an experiment was conducted on the RC beam after truck collision to obtain material parameters. The nonlinear finite element models of two experimental beams were then corrected according to experimental results, based on which the experimental schemes of the damaged beam were designed and its loading test was performed. Finally, according to the experimental and finite element calculation results, the concept of damage coefficient was adopted and the calculation methods for the flexural capacity of the damaged beam were proposed. Research results indicate that the normal section failure at the midspan of the damaged RC beam arises from the edge position of the damaged region. The upper concrete on the section of the damaged part is crushed under the failure. The normal section bearing capacity of the damaged beam is slightly lower than that of the undamaged beam. The short-term flexural capacity of the damaged beam can be determined by the 5% decreasing bearing capacity of the undamaged beam only when the concrete in the tensile region is damaged after collision. The bearing capacities of the damage beam may be determined by the calculation formula for rebar damage when they are cracked. This research provides the theoretical and experimental foundations for the evaluation of the technical state of the RC bridges after collision.