A probabilistic approach to quality control and assessing initial reliability precast reinforced constructions

The study aims to improve methods for assessing the serviceability of prefabricated reinforced concrete structures based on an integral estimation of their reliability following the operational monitoring of individual parameters. The serviceability criteria of the investigated structures are set on a probabilistic basis, addressing the main methodology for their field tests according to GOST 8829-94. The proposed non-destructive testing of output is computerised and is carried out every shift together with the versatility of technological factors. The calculation results on the reliability assessment program are a basis for the acceptance of a batch according to the required strength, stiffness, cracking resistance. To develop a probabilistic algorithm for assessing the reliability of works, an optimal calculation model accurately describing stress-strain behaviour (SSB) under loading is necessary. It is strated that a calculation based on design standards and a model with account non-linear nature of deformation occurring in reinforced concrete as elastoplastic material can be used. The reliability and adequacy of the selected models were confirmed by comparing the theoretical data with the results of work field tests performed at the Bratskzhelezobeton plant. As an example, a calculation model for the SSB assessment in load-bearing wall panels with applied combined stress (biaxial bending) was substantiated. A methodology and regulations for automated every-shift quality control of precast reinforced constructions were developed following the versatility of technological factors. Introducing the proposed quality control system to factories manufacturing reinforced concrete products allows the number of structure field tests to be reduced by 6-10 times and the cost of manufactured products by approximately 2.5%.

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