Sovgyra V. Stress-deformed state and bearing capacity of eccentrically compressed short concrete columns

The object of research is the influence of significant factors on the intensity of the development of structural destruction, deformation and destruction of concrete in the process of axial and eccentrically compression on the general patterns of resistance of heavy concrete to the prism strength in the range fc,15 =22,2…65,6 MPa at "soft" and "hard" modes of short-term static load; the purpose of the study is to determine the quantitative and qualitative effects of such factors as: the strength of heavy concrete; its micro- and macrostructure; elastic-viscous properties; dimensions and height of sections; eccentricity and load modes on general patterns of concrete resistance with axial and eccentrically compression of geometrically similar concrete short columns with a "soft" and "hard" mode of short-term static load; methods - the collection, study and analysis of literary sources, the formulation of research tasks, the development of a method for performing on-the-spot experimental studies of monochromatic and nonuniform compressed geometrically similar concrete short columns with a "soft" and "hard" mode of short-term static loading in accordance with the requirements of current standards with the use of modern methods of strain gauging, optical microscopy, ultrasonic defectoscopy for measuring homogeneous and inhomogeneously compressed concrete deformations and mathematical methods statistic the processing and analysis of the results, mathematical and physical modeling of stress-strain state research items, compare calculation results with the experimental data, the formulation of key findings and recommendations on the implementation of research results into practice design; results - developed engineering methodology for determining the bearing capacity and deformability of nonuniform compressed geometrically similar concrete short columns with "soft" and "hard" modes of short-term static load, which takes into account the influence of the height of the section, the magnitude of the eccentricity and the strength of heavy concrete and provides the opportunity to get more reliable results; implemented in the educational process of the OSACA during the preparation of the masters of the construction profile, as well as in the design practice of the Center for the Architecture and Construction of the Academy of Construction of Ukraine and the practice of designing the construction and reconstruction of civil and industrial frame structures of reinforced concrete structures by the design organization LLC "Adept-Project".