Abstract
The use ofFRPrebars has become in the last decades at the head technologies of internal reinforcement of concrete sections instead of normal steel bars for their lightweight, portability and have a high tensile strength in addition to their resistance to rust and corrosion.This paper presents the inelastic response of 4-story reinforced concrete framepartially reinforced with Carbon FRP rebars. Thisframe was analyzedunder actual blast loadusing high strength concrete.Two-dimensional Beam-Column Element has been used in representing the frame members. A computer program hasbeen developed (in Fortran-77) for analysis purposes.Lump plasticity model has also been used, which depends on the concept of plastic hinges that reflect the inelastic behavior of the element, assuming that inelastic action is lumped at both ends of the element as plastic hinges. An interaction diagram between axial forces and moments is determined; this diagram is considered as a Yield Surface which represents the limits of the ultimate strength of the element.A direct Systematic integration technique has been used depending on Newmark's Predictor-Corrector method to solve the equation of motion.Based on the results obtained, it can be seen that CFRP rebars have the ability to increase the flexural resistance of reinforced concrete sections, which contributed to the increase in their strengthsand their ductility;consequently, they reduce the number of plastic hinges formed in the frame, as well as delay in the time of their formation.
