Abstract
The problems of the fracture mechanics hypotheses development are formulated with reference to the calculation of reinforced concrete structures in the presence of cracks. The main aspects of fracture mechanics are given. They focus on the features of the predestruction zone, as well as the hypotheses and assumptions underlying the calculation of reinforced concrete structures for the second group of limit states. It is described the features of cutting a two-cantilever element including a crack for constructing an effective instrument of calculation for reinforced concrete with allowance for physical nonlinearity, cracking processes, bond of reinforcement with concrete, and the effect of discontinuity. It is obtained a new solution to the problem of the stressed-strained state of the reinforced concrete element in the zone immediately adjacent to the crack.
Highlights
The main characteristic feature of reinforced concrete is the presence of cracks in resisting its force and deformation effects
It is a problem that is investigated by the fracture mechanics, actively developing in recent years [01-04]
It should be borne in mind that for concrete as an elastoplastic material, laws of linear fracture mechanics are not applicable
Summary
The main characteristic feature of reinforced concrete is the presence of cracks in resisting its force and deformation effects. The main aspects of fracture mechanics emphasizing the features of predestruction zone of and communications between key parameters of КI, I with the localized deformation of in this zone. It follows from their analysis [01, 03, 05, etc.] that: 1) the two surfaces of the crack should close smoothly, in order to avoid an unreasonable increase in stresses in the end zone to infinity; 2) due to the large curvatures of the closing surfaces in the prefracture zone, surface tension forces that newly crimping the formed crack surface to each other; 3) according to the Barenblatt’s postulate [9], the measure of the interaction forces in the. Is shown, based on the noted aspects and their analysis, the development of hypotheses of fracture mechanics in relation to reinforced concrete structures was carried out
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