Ignatenko A. Stress-Strained State of Steel-Concrete Structures under Thermal and Force Actions

The object - the investigation is concerned with steel and concrete constructions with the external sheet reinforcement working in bending; the aim - the purpose is to develop the design procedure of steel and concrete beams and slabs on the thermal and force exposure in moderate and high temperatures as well as the selection of an efficient variant of the fire barrier of such constructions in conditions of the "standard" fire; methods - the investigation techniques used are as follow is: structural mechanics; theories of elasticity and plasticity finite differences, mathematical statistic's; finite elements; the novelty lies in the fact that the design procedure of the stressed and deformed state of the two layer steel and concrete slab in force and temperature exposures has received the further advancement; the design procedure of the stressed and deformed state of a steel and concrete beam in the "standard" fire with regard to different conditions of its supporting has been improved; for the first time, computing models for the numerical research of the operative constructions with external sheet reinforcement (beams and slabs) in the thermal and force exposure have been devised; alternatives of the fire barrier of steel and concret construction in keeping with operative normative; results - the technique of calculation of steel-concrete constructions with external sheet reinforcement to thermal force action with fire protection's selection effective editions is proposed; scope of use - construction and reconstruction of the industrial service objects.