Calculation residual strength of reinforced concrete beams with damages, which occurred during loading

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Abstract
The article presents the development of a method of experimental study of reinforced concrete beams with damaged steel reinforcement. In addition, the purpose is to conduct experimental tests of undamaged samples with steel reinforcement of 20- and 16-mm diameter. Also, the 20 mm steel bars were damaged to the area equal to 16 mm samples, experimental tests of such samples were performed and corresponding analysis and comparison of the results of both tests was conducted. According to the study program, 6 beam samples were tested. Two of them were undamaged control samples with single load bearing reinforcement of Ø20 mm diameter; 2 samples with Ø20 mm reinforcement had about 36% damages (which corresponds to area of the 16 mm diameter samples) and 2 samples with Ø16 mm single reinforcement, which corresponds to 36% load bearing reinforcement damage of control samples (the area of 36% damages of 20 mm samples corresponds to 16 mm diameter). The experimental study identified the strength and strain parameters of reinforced concrete beams with damages in the load bearing stretched reinforcement due to the action of the bending moment, which causes the exhaustion of the bearing capacity.

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