Lenkiamos gelžbetoninės sijos įtempių tarp plyšių analizė
State of Stress of Bent Reinforced Beams in Areas Between Cracks

Summary/Abstract: Cracks in reinforced concrete structures occur in the process of production, transportation, assembling and usage. Experiments show that distances between usual cracks in the zone of pure bending of reinforced beams is practically the same. The number of cracks in the beam remains more or less constant till the start of flow of main reinforcement. On the assumption that there are no plastic strains between cracks in concrete blocks the problem of stress distribution by the means of methods used in elastic theory can be solved. The state of stress in concrete blocks of beams is determined by the means of the net method. The element with cracks is covered with a net so that the lines in the net coincided with the crack. The apex of the crack is to be on the spot of the net by all means. Calculations prove that the state of stress in cracked reinforced concrete beams changes in comparison with that in elastic stage. Vertical and horizontal normal stresses depend on the height of cracks and the distance between them.

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