عنوان مقاله [English]
Concrete shear walls are major systems resisting lateral loads due to earthquakes in high rise buildings. Nevertheless, structural damage and early code shortcomings have effectively harmed the function of existing structural walls against earthquakes. In recent years, Fiber Reinforced Polymer (FRP) materials have been used extensively in the strengthening and retrofitting of structural elements. The excellent features of FRP materials, such as very high tensile strength, high tensile modulus, low density, and corrosion resistance, set them as the first alternative in strengthening projects. However, a review on previous studies shows that, so far, very limited analytical and/or experimental studies have been conducted on the FRP strengthening of slender RC shear walls under monotonic loading. In this study, the effect of FRP confinement of boundary elements in slender RC shear walls on the overall behavior of boundary elements is investigated. The finite element software is calibrated and verified using available experimental data. Nonlinear finite element analysis of reinforced concrete walls is performed using a damage plasticity model and tension stiffening effects. Results show that longitudinal strengthening plays a major role in the wall load carrying capacity, while transverse strengthening for confinement considerably affects wall displacement and ductility. Furthermore, increasing the number of FRP layers has a significant effect on overall wall behavior. In addition, results show that in the wall strengthening layout, it is sufficient to emphasize boundary elements only in the plastic hinge region.