The questions related to the study of various varying factors on the strength of normal sections in beams. Here's a program of research by one methodology designed to study the effect of the type and content of steel reinforcement and externally composite on the strength of normal sections that have not previously been investigated.

Keywords: Concrete, reinforced concrete, the percentage of reinforcement, carbon frp sheets, fiberglass, laminates

It was provided some information about the character of crack formation and failure of prototypes, which strengthened by three deferent type of composite materials. It was fixed some increased in the crack’s number in beams which reinforced with glass fiber canvas, and 6 deferent mode of failure in strengthened beams.

Keywords: concrete, steel, anchor, composite materials, prototypes, failure modes, load level

Some information was provided about the experimental values ​​of crack width in reinforced concrete beams, which strengthened by three deferent types of glass and carbon fiber reinforced plastics. It was found that, when the strength and modulus of composite are increased, to the width in normal cracks is reduced. Having U-shaped clamps, anchors at the ends of the composite caused a greater reducing in their development. These factors should be considered in theoretical matters.

Keywords: Concrete, reinforced concrete, the reference beams, prototypes, cracks, crack width, the level of the composite reinforcement

An information, is given about the method of strengthening the tested samples by the general requirements of plant’s manufacturer for three types of composite materials. It was presented a dates about the application stages and control of the load intensity  

Keywords: Concrete, cement grout, notching, primer, putty, glue composition, stages of loading, the load level indicator, graduation

Provides information about the strength of the concrete, the size of the cross section of experienced beams, the options of their reinforcing and strengthening with various types of composite materials. Provides a scheme of testing with short-term load  

Keywords: Steel, concrete, reinforced concrete, strengthening, anchors, span , percentage of steel and composite reinforcement, load, failure