Study on Impact Resistance of Corroded Concrete Beams

To study the mechanical properties and failure modes of corroded RC beams under impact, this paper verifies the accuracy of finite element model established by finite element software ANSYS/LS-DYNA through impact test of concrete beams conducted by Fujikake et al. Based on the verified finite element model, the influence of corrosion rate of reinforcement on the impact resistance of concrete beams was researched. The finite element analysis shows that the concrete spalling degree of concrete member under impact effect increases with the increase of steel corrosion rate. The higher the degree of steel corrosion, the more serious the concrete spalling. All the corroded RC beams at different impact heights exhibit flexural failure characteristics. Steel corrosion has a certain influence on the impact resistance of reinforced concrete members. At the same drop hammer impact height, the peak impact force decreases and the mid-span displacement increases with the increase of steel corrosion rate. When the height of impact is 2.4 m, the peak value of impact force decreases to 29.0%. when corrosion rate is 30.0%, and the mid-span displacement increases to 15.7% when it is not corroded.