Otrosh Y. Technical condition of reinforced concrete structures under strength and high temperature influences

The object of research is the process of deformation and destruction of the exploited reinforced concrete structures of buildings and structures under force and high temperature influences; the purpose of the research is to develop a methodology for evaluation, forecast and regulation of the technical condition of the exploited reinforced concrete constructions, buildings and structures as a whole under force and high-temperature influences on the basis of direct and differentiated factors that characterize their stress-strain state; research methods ─ methods of diagnostics of the technical condition of building structures with determination of their controlled parameters; methods of mathematical statistics and probability theory for processing research results; experimental methods of research of building structures under different influences, which are based on advanced methods of research of structures at tests and examinations of the damaged constructions of buildings and structures during operation with the involvement of modern devices and equipments; calculation methods of building structures for both groups of boundary states; methods of mathematical modeling of operating processes; results ─ development of a comprehensive approach to determine the technical condition and the possibility of further exploitation of building structures of buildings and structures after fires and other high-temperature impacts; a model has been developed that takes into account additional factors - increase of power loads and high temperature influences; a model for predicting the state of a structure if it is subjected to high-temperature effects is developed; an approach to the design of structures in the combined action of power and high-temperature influences is proposed, which allows in advance to take into account possible changes of controlled parameters in the design; experimental researches of building structures, fragments of buildings and structures under combined action of power and high-temperature influences have been developed and conducted; the methods of regulation of the technical condition of building structures, as well as the method of monitoring of building structures are proposed; implemented ─ to the design practice of NSIBC (Kyiv), Ukrainian engineering company CBMFORUM (Kyiv), LLC "Global Project" (Kyiv), GORMASH Scientific and Production Company (Kryvyi Rih) ), Slavsant Pipe Plant (Pavlograd), methods of calculation of structures which damaged during operation from power and high temperature influences, which allow to develop recommendations for predicting the technical condition of structures during their operation and to reasonably determine the life of structures, as well as in the educational process of National University of Civil Defence of Ukraine for bachelors and masters in disciplines "Buildings and structures and their behavior in emergency situations" and "System for providing protection of population and territories in emergency situations"