Nonlinear Finite Element Analysis of Bonding Behavior of Corroded Mortar Anchor under Dynamic Load

The connection between reinforcement and mortar was established through the surface-to-surface contact method. The transient dynamic Full method was adopted for dynamic loading solution. The numerical analysis model for the bonding performance of corroded mortar bolts under dynamic load was established. The numerical analysis results were compared with the test results for verification. The bond properties of the anchorage interface under the conditions of different mortar protection thickness, anchorage length and corrosion rate were analyzed. The results show that the numerical simulation results are in good agreement with the test results. The numerical model can analyze the bonding performance of the corroded mortar bolts. Within a certain limit, the bond stress is positively correlated with the thickness of the mortar protective layer.The larger the anchorage length is, the greater the bonding stress at the loading end will be, and the more uneven the distribution of bonding stress in the anchorage segment will be. However, when the anchorage length reaches a certain value, the continuous increase of anchorage length will have no obvious effect on the improvement of its bonding performance, so there is an optimal anchorage length. With the increase of the corrosion ratio, the bonding stress peck decreased gradually.