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KINASH, R. I. Inverse problem of reliability for reinforced concrete constructions. In: CONGRESSO INTERNACIONAL SOBRE O COMPORTAMENTO DE ESTRUTURAS DANIFICADAS, 1998, Rio de Janeiro. Anais... Rio de Janeiro, 1998.
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Abstract

The problem of finding tolerance for industrial parameters of reinforced concrete designs is considered which should have predetermined guaranteed provision. All the mentioned elements are changeable, nevertheless inconstancy of only some of them can be stated, whereas inconstancy of others can be affected in the process of manufacturing. Yes, at the stage of a factory design compression resistance of reinforcement cannot be affected, as it is delivered from the factory prefabricated. We also take into account that concrete is produced in some other place as well, and its resistance can be measured only on the basis of examination of previous products. The area of cross section of reinforcement is changeable as well, and it is impossible to direct it at the level of the area of an individual bar. The case of not delivering cores or their excess is, in our opinion, a gross mistake and it won't be considered. The only element that can be affected at the stage of final manufacturing of a column is its cross section. Thus it is experimentally proved that the inconstancy of the size of column or beam cross section in the direction of formwork is insignificant, whereas the height of the formation varies to a great extent. Therefore the task was reduced to finding tolerance for the height of formation of concrete in the form. For any higher level of provision maximum requirements to the depth of section of concrete requirements are higher, and they lay below design value. It means that real beam has considerable additional tolerance.
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