The article presents the evaluation results of load-bearing capacity exhaustion of steel-concrete slabs under concentrated and distributed short-term loading. The authors investigate the performance peculiarities of square, circular, and octagonal samples. The results of the experimental research were verified by comparison with the results of finite element modeling in the LIRA-SAPR software package. The obtained results proved the theoretical equations that allow to define the load-bearing capacity of steel-concrete slabs during their destruction over the cross-section and along the contact of sheet reinforcement with concrete. It is recommended to find the required intensity of sheet reinforcement anchoring from the condition of equality of ultimate loads. The authors provide further FEM analysis of square slabs to evaluate the impact of anchor spacing, the thickness of the steel sheet, and supporting conditions of slabs on their load-bearing capacity.

The authors proposed the results of fire resistance evaluation of steel-concrete beams with external sheet reinforcement at standard temperature range of fire in the room and justified specifications for flame-retardant coat due to design standards. In order to analyze fire resistance the three-dimensional computer models were developed taking into account the basic conditions of beams loading and bearing as well as non-linear "stress-strain" dependencies of concrete and external reinforcement.

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Вказано на неоднозначність у визначеннях категорій технічного стану будівельних конструкцій. Для залізобетонних конструкцій наведено уточнені формулювання категорій, в яких усунуто неоднозначність їх трактувань. Запропоновано додаткові класифікаційні ознаки технічного стану. На основі результатів дворівневого оцінювання несучої здатності

Abstract. Determination of critical load values of eccentrically loaded columns was subject of studies by such authors as Vatulia G. L., Galagurya E. I., Glazunov Y. V., Zhakin I. A., Opanasenko E. V., Storozhenko L. I., Timoshenko S. P., Trull B. A., Hoff N. D., Chikhladze E. D. and other researchers. However, those works have not studied properly work of statically determinable and statically indeterminable columns, compressed eccentrically at one end and being under the axial compression at the other one. The article deals with the problem of determining the critical load for the following design patterns: a column that is loaded at the ends by longitudinal forces by equal and singledirection eccentricities; a column that is rigidly clamped at the bottom, hinged at the top and loaded by longitudinal force at the upper end eccentrically; column rigidly clamped at the bottom, loaded at the free end of the longitudinal force eccentrically; a hinged column, loaded at the upper end of the longitudinal force eccentrically. Critical load of excentrically loaded columns with different types of bearing and load patterns can be determined using the obtained equations. Allowable deflection value according to the regulatory documents and geometric characteristics of the considered columns should be specified to solve these equations.