Numerical Modeling of Reinforced Concrete Strengthened Columns Under Cyclic Loading

摘要

Although many numerical investigations are available on external strengthening of reinforced concrete columns using fiber-reinforced polymer jackets, there are few numerical investigations presented on rectangular/square reinforced concrete columns subjected to cyclic lateral loading. In the present work, numerical analyses on square reinforced concrete columns strengthened using fiber-reinforced polymer and steel bars were carried out. This paper is divided into two parts. In the first part, two numerical models were presented to predict the cyclic behavior of the columns strengthened using either glass fiber-reinforced polymer or steel bars. The results of the first part showed a good accordance between the numerical modeling and the experimental laboratory tests. The second part reports a numerical investigation that evaluates the comparative behavior of reinforced concrete columns strengthened with glass fiber-reinforced polymer subjected to cyclic lateral loading, in which a parametric study related to the amount of the glass fiber-reinforced polymer material wrapping with 1-3 layers was performed. The results of the parametric study revealed that although the general behaviors of the columns are slightly similar in terms of load capacity and maximal displacement, the solicitations at the glass fiber-reinforced polymer material scale and the values of the cracks corresponding to the maximum load are different. The main objectives of this numerical modeling were to provide a comparison between the numerical models and the experimental tests and to show the necessity to perform more complex numerical simulation to describe the behavior of strengthened materials in finer scale.