Al-Rafidain Engineering Journal (AREJ)

The technique of using carbon polymer fibers to strengthen and rehabilitate structural beams considered one of the modern techniques that have proven its effectiveness in various civil engineering projects. From this point of view, this review came to clarify the practical benefit of using this technology to inform researchers and workers in the construction sector about it and to provide modern sources for those wishing to conduct More researches in the field of strengthening and rehabilitating concrete, iron and composite structural beams and highlighting the studies that dealt with flexural, shear and torsion resistance of beams and reinforced with carbon polymer fibers externally or internally . 

The use of Carbon Fiber Reinforced Polymers CFRP in strengthening and rehabilitating structural members is one of the modern techniques which proved to be effective in different civil engineering applications. This review aims to provide the researchers and construction specialists with a detailed description on the practical application of External or Internal  Carbon Fiber Reinforced Polymers in strengthening and rehabilitating concrete, steel, and composite members in flexure and shear.

Abstract This paper reports experimental data on the behavior and strength of high-strength concrete deep beams reinforced with shear reinforcement. Tests were conducted on eight reinforced concrete deep beams with stirrups in different type and positions using high-strength concrete (compressive strength of about 85.0 MPa). The beams measured 1400 mm long, 100 mm wide and 300 mm deep, and were tested under two point loads. The test variables were type and position of web reinforcements [Shear stress of vertical stirrups (vfy), Shear stress of horizontal stirrups (hfy) and Shear stress of inclined stirrups (αfy)] within shear span, within middle span(between two point loads) and along the beam. Conventional steel bars were used as longitudinal reinforcement in this investigation. The test results indicated that beams with vertical and inclined shear reinforcement within the shear span (B4) resisting the ultimate load of about 417.90kN. While beams with horizontal shear reinforcement (B3), shear reinforcement between two point loads (B7), and the beam without shear reinforcement (B8) resisting, 255.77, 260.18 and 250.55kN respectively. All the beams failed in shear and the optimum position of stirrups is the shear span for high strength concrete deep beams and with combination of vertical and inclined stirrups.
Keywords: Concrete; Deep beams; High strength; Position; Shear; Stirrups.