In this article considered the questions related to the strength of normal sections in reinforced concrete beams, in which steel reinforcement is completely or partially replaced by a fiberglass rod. It was established that the strength of such beams is less, but the strain is significantly higher compared to the traditional reinforced. Calculating with current standards dramatically overstates theoretical bearing capacity of these beams with composite reinforcement

Keywords: concrete, reinforced concrete, strength, normal sections, steel, fiberglass reinforcement GFRP, composite materials, research

In this article considered the questions related to how the deformability is influenced in concrete beams, in which steel reinforcement replaced with fiberglass GFRP or a combination (hybrid). The latter is very important, as the current standards do not account the increased in strength of composite reinforcement, whereas its elasticity modulus is lower than the elasticity modulus of steel reinforcement.

Keywords: concrete, reinforced concrete, strength, deformability, steel, fiberglass reinforcement GFRP, composite, the modulus of elasticity, deflection