Work number - M 44 AWARDED
Maslii O.А., Zyma О.E., Chursa Yu.V., Avramenko Yu.О.
Presented by Poltava National Technical Yuri Kondratyuk University.
The aim of the work is to solve the problem of fuctional reliability maintenance of complex building systems with the usage of new high-tech and resource-saving methods and structures on safety improvement principles.
The basic conceptual principles of the emergence, manifestation and influence of threats to the security of the national economy and complex building systems in its composition, from causes and factors identification that violate its balanced state, stability, development, to the characteristic of threats negative signs that manifest themselves in the initial security parameters was formed. A structural model of the emergence, spread and impact of threats to the national economy security was proposed. That model, contrast to the situational response, enables to take into account the stages of the threat life cycle and to carry out their neutralization at the starting point initial stage.
Practical method of reliability probabilistic calculation of the steel main pipeline linear part is developed in the work. The developed method for determining the quantitative reliability indices large linear systems, taking into account the time factor, enables to design structures with a given reliability level and theoretically substantiate the optimal frequency of large linear systems current repairs on the example of main pipelines, as well as to predict the terms for their overhaul repairs.
The results of experimental and theoretical studies key connections were carried out and summarized. The recommendations for their safe and reliable design were provided. As a result of the study, the possibility of the variation method usage, based on the concrete plasticity theory, to calculate the strength of element’s key connections of structural building systems was confirmed and recommendations for improving the key connections of the constructive systems "KUB-2,5" and "ARCOS" were provided.
The influence of a concrete component working in conjunction with a thin-walled steel plate, different geometric characteristics of the selected materials and boundary conditions on the bearing capacity of the steel reinforced concrete element was investigated. In the work, using theoretical and numerical analysis, the dependencies characterizing the stress-strain state and the conditions of the combination of thin-walled concrete structures with concrete were revealed. Experimental researches revealed a some structures work peculiarities.
The main results of the research were highlighted in 157 publications, including 3 monographs, 1 textbook, 1 manual, 106 articles (16 in foreign journals). According to the Scopus database, the total number of references to authors' publications, presented in the work, is 18, h-index – 1; according to the Google Scholar database, the total number of references is 116, the h-index – 4. According to the subject of the work, 4 PhD's theses were defended. Novelty and competitiveness of technical solutions were protected by 3 patents for utility model and 1 certificate of registration for work copyright, and also widely applied in construction practice