Reinforcement slip model considering corrosion effects

A new bar slip model is developed to account for the contribution of reinforcement anchorage slip to the total displacement of corroded reinforced concrete (RC) members. An analytical procedure is proposed to model the distribution of the reduced bond stress along the corroded steel bar to predict the reinforcement slip in the anchorage area. The reinforcement slip is formulated using an existing model and by new governing equations defined for different bond regions. The possibility of having an insufficient embedment length is also considered, and a corresponding failure criterion is defined. The bar model is validated by comparing the available data from single bar pullout experiments and an existing bar force-slip model. The proposed column model is implemented using a fiber element model to capture both the monotonic and cyclic behavior of corroded columns. Pseudo-static test data from corroded column specimens are used to validate the proposed column model. Overall, the proposed model captures the slip of a single corroded bar reasonably well to accurately simulate the total lateral displacement of columns with corrosion damage.