Authors : Hayder H. Alkhudery, Oday M. Albuthbahak and Haider A.A. Al-Katib
Abstract: Fiber Reinforced Material (FPR) has become an effective alternative reinforcement for concrete constructions owing to their higher ultimate strength in tension and strongly anticorrosive properties. However, the low ductility behaviour of FRP Reinforcing Concrete structure (FRP-RC) is appeared comparing to high ductility of conventional Steel Reinforcing Concrete structures (S-RC). Successfully hybridization of reinforcement by combining FRP and steel rebar presents effective solution to migrate corrosion of steel rebar in steel reinforcing concrete constructions and advanced ductility of FRP-RC structures. Also, a good improvement is achieved in structural performances of concrete beams in terms of ultimate strength, central deflection, number cracks and crack width. In this study, a theoretical prediction analysis model of Hybrid Reinforcing Concrete (H-RC) members reinforced by FRP and steel rebar presents. The moment-curvature relationship is predicted to achieve load-deflection curve and bending moment capacity of beams. A good agreement has been indicated from verification between results of predicted theoretical model and 19 experimental results of other researcher. The hybrid reinforcement in HRC section can be replaced by equivalent steel ratio to conduct limitations of reinforcement ratio. The ductility index of H-RC members is measured to reference S-RC member while the ultimate strength index is measured to reference FPRC member. A critical limitations of (Af /As) ratio is found for H-RC members for specified mechanical properties of concrete, steel and FRP rebar also, this limitations are affected by the equivalent steel ratio of hybrid concrete section. A parametric study of different parameters specially that influencing the amount of hybridization reinforcing ratio (Af /As) is involved to explore the critical margin of (Af /As) ratio utilizing the ductility and ultimate strength requirements. Also, various modes of failure were conducted to the corresponding area of reinforcing FRP and steel rebar.
Hayder H. Alkhudery, Oday M. Albuthbahak and Haider A.A. Al-Katib, 2018. Investigation of Effective Hybrid FRP and Steel Reinforcement Ratio for Concrete Members. Journal of Engineering and Applied Sciences, 13: 5150-5161.