Otrosh Y. Determination of the controlled parameters of reinforcement of in-situ concrete structures by the method of local destruction

Dissertation is devoted to development of associate measures on determination of the controlled parameters of reinforcement of concrete structures at the united action of different factors with the subsequent use of findings for the ground of possibility of extension of term of maintenance or necessity of repair (replacements) of members. The experimental method of determination of the controlled parameters is improved, that had allowed to conduct experimental researches and to set dependence of the strength of reinforcing rods from the efforts of the destruction of the thread (screw-thread). Simulation of the work of reinforcing steel with the destruction of the thread was done by the method of finite elements. For the three-dimensional finite element it was adopted by the diagram, whose parameters were obtained by standard tests. This has allowed taking into account the nonlinear work of steel in the finite-element model. On the basis of the conducted research the methods of determination of the controlled parameters and estimation of the technical state are developed, calculation of the tensely-deformed state and ground of subsequent reliable maintenance of building constructions and buildings after power and high temperature influences. The developed methods allow to take into account properties of material of constructions, and also possibility of change of descriptions of materials after high temperature influences, and applied at the decision of practical tasks. Keywords: on-the-road reinforced-concrete structures, cored reinforcement, local destruction, descriptions of durability.