Timchenko R. The interaction of bed plates with irregularly-deformed basement under complex loading.

The object of the study is the process of bed plates - irregularly-deformed basement interaction under complex loading. The study is aimed at scientific grounding and method development for analyzing bed plates which interact with irregularly-deformed basement considering inelastic deformations of reinforced concrete and soil under complex loading. Research methods: experimental methods to research materials, constructions and structures in laboratory, stand and on-location conditions; mathematical statistics methods for experimental data processing; mathematical modeling of influence of different factors on bed plates; comparative analysis of modeling experimental data and existing solutions; finite elements method, classical method of structural mechanics; rigidity coefficient method. Practical and theoretical significance of the data obtained consist in: creating and testing of the methodology, experimental equipments mechanisms used at modeling and on-location testing of bed plates which interact with irregularly-deformed basement; developing the program of modeling on the basis of the comprehensive approach to determining constructive solutions for bed plates. The scientific novelty of the data obtained consists in the fact that it is fur the first time that basic principles of designing bed plates on an irregularly-deformed basement have been stated; comprehend approach to determining parameters of bed plate contractures under irregularly deformations of basements considering non-linear work of soil and materials under complex loading; experimental dependencies "load - set" at loading and relieving full-size plates on the natural bed have been obtained; regularities of bed plates - irregularly-deformed basement interaction at the state of relief have been determined for the first time; the dependency for calculating a variable rigidity coefficient at the stage of relief has been obtained for the first time; deformation criteria of limiting states have been received on the basis of analyzing non-linear work of constructions and basements at the stage close to destruction; regularities that enable to determine constructions' resistance to overturning at irregular deformations of basements and to take into account change of rigidity characteristics in fully loaded and relieved zones at its additional deformations have been obtained for the first time. The results of the author's research have been used in developing recommendations on calculating and designing basements of building and construction in complex geotechnical conditions and in designing basements for various building and constructions. The results are recommended for introducing by production and design organizations.