Dynamic Response and Failure Mode of Reinforced Concrete Beams Subjected to Impact

The dynamic behavior of reinforced concrete (RC) beams under impact loads is highly complex. In this work, the failure modes, impact force, displacement, and internal force of RC beams under impact loads were studied in detail with different research parameters. Firstly, a numerical model of RC was established, and its reliability was verified through a series of tests. Then, seventeen groups of different parameters were designed and analyzed. These parameters included the shear–span ratio of the RC beams, the impact velocity of a drop hammer, concrete strength, and boundary conditions. The results indicate that the shear–span ratio and boundary condition of RC beams have no noticeable influence on the maximum impact forces. The maximum displacement, residual displacement, and vibration period of RC beams with fixed-oundary conditions are obviously less than those of supported RC beams. The negative moment of RC beams subjected to impact loads needs to be considered in design due to the many cracks near the supports caused by the negative moments. The shear force of RC beams with a fixed condition is greater at the support section, which requires detailed consideration.