In the past various researchers conducted numerous experimental studies, in which different rehabilitation techniques were developed. Among them, use of fiber reinforced polymers (FRPs) was found to be an effective alternative with rapid retrofit time and providing substantial increases in strength with limited ductility. In order to design and detail FRPs based on the results of experiments, analysis and design procedures need to be established. The objective of this study is to fill this gap and propose analysis guidelines for FRP strengthened infill walls for use in seismic evaluation methods. For this purpose, a diagonal compression-strut and tension-tic model is presented to model the strengthened infill wall that is integrated to the boundary frame members. The comparisons of test results with estimated load-deformation curves show that model is capable of estimating stiffness, strength and deformation capacity of FRP strengthened reinforced concrete frames with sufficient accuracy. The outcome of this research is believed to enable the structural engineers to perform retrofit design of deficient infilled reinforced concrete frames with FRPs.