Vatulia G. Calculation and design of combined and steel concrete structures

Subject - steel concrete structures with external steel sheet or rolled shape reinforcement under bending, axial and eccentric loading; aim - solution of a problem of calculation and design of steel concrete and composite structures under force and temperature influence together with their volume, cost and mass minimization; methods - methods of building mechanics; theory of elasticity and plasticity; finite difference method were used during the theoretical investigations; methods of test planning and math statistics were used during the experimental researches and data analysis; finite element method were used during the structural behavior numerical simulation; novelty - It has been developed analytical methods of calculation of steel concrete structures under force and temperature influence considering nonlinearity of concrete deformations, flexibility of contact between steel and concrete, non-stationary heat and humid environment with a flexible evaporation line while considering changes in physical and mechanical characteristics of materials in heating. New experimental data regarding operational state and deterioration of steel concrete structures at various carrying conditions and support, influence of an anchor spacing and types of anchor supports on combined effect of concrete and steel; concrete steadiness and width of external reinforcement of carrying capacity have been obtained. Basics of theoretical research of an effective combined construction according to the first and second limit conditions have been proposed. The finite element models for assessment of stress-strained state of steel concrete structures for heat power effects have been designed; results - The proposed methodologies of structure formation and calculation ensure the new effective steel concrete structure creation able to bear bending and compression loading; helps to provide the structures design with decreasing of cross section parameters, construction cost and materials consumption. Utilization efficiency of modern fire-resistant coverings to protect steel concrete structures has been substantiated; field of application - are construction and reconstruction of industrial buildings and structures.