The use of metal structures as load-bearing elements of building frames is incredibly extensive. They are used in all areas, from the construction of bridges to the construction of airports and other equally important facilities. Based on this, it is necessary to design such structures extremely accurately, take into account all possible effects on the elements of the building and lay the necessary safety margins. In turn, fire, as one of the extraordinary loads, must be investigated in all its aspects. From the study of the development of a fire, to the structural analysis of elements exposed to fire. This article is devoted to determining the fire resistance of steel beams by two approaches - analytical and numerical, as well as comparing the results. After testing the beam with two methods, it was concluded that the maximum value of the deflection rate in the analysis is 32.6 mm/min, which exceeds the limit value. Since only one limit condition is exceeded, the beam is considered to meet the R30 fire resistance requirement. To increase the fire resistance of the structure, it is necessary to apply various methods of protecting the beam section.

Keywords: metal structures, load-bearing element, extreme load, structural analysis, fire impact, fire resistance

The possibilities of using advanced software for effective analysis and design of building structures are currently being explored. Rapid assessment of the state during design, assessment of the ability to resist any of the loading environments. The finite element method possesses these qualities. In this article, a nonlinear FE analysis of cold rolled steel beams Z-profile under bending load using ANSYS software. The bending resistance of two types of beams is compared, a Z-beam with hollow flanges and a Z-beam with solid flanges. A beam with hollow flanges exhibits better deformation characteristics than a solid one. Based on the analysis, the following conclusions are drawn: The proposed hollow flanged element shows better resistance towards deformation; Since the hollow section follows a single profiled failure pattern the point of failure is extended; The stiffness of hollow flanged Z section is nearly four times greater than that of solid flanged Z section.

Keywords: efficient analysis, finite element method, Z-profile, deformation characteristics, nonlinear FE analysis

Assessment of flexural strength is important in the design of steel beams. In this paper, analytical studies have been carried out to determine the flexural strength of conventional steel I-beams and steel corrugated beams. An experimental program was analyzed for four beams with a simple support and different web configurations (flat or corrugated) and different flange thicknesses (thin or thick). In the course of experimental work, the effect of a decrease in the bending capacity of a beam due to a corrugated web was determined. To simulate the tested samples and check the results of the experimental part of the work, a nonlinear finite element technique was used. After receiving the results, the following conclusions were made. First, the bending capacity of the corrugated steel beam is less than that of the conventional steel I-beam, in the range of 10 to 20%. Second, the flexure of the flat-web steel beam showed local buckling of the flange followed by local buckling of the web, in contrast to the steel girder with a corrugated web, which previously showed only local buckling of the flange. And third, the finite element model can simulate the behavior of steel beams, especially in the elastic stage, with an acceptable degree of accuracy.

Keywords: steel beam design, flexural strength, corrugated web, flange thickness, bending capacity, finite element technique, web configuration

Storage of volatile and flammable liquids is carried out, as a rule, in vertical steel tanks. In total storage, they make up more than 80%. That is why research in this area is important in industry. The issue of reducing the cost of manufacturing tanks and reducing material costs during construction is extremely relevant. Based on the dependences of the optimal diameter, height and mass of the hull on the volume of the vessel, calculations were made for the existing TVS-10.000. In this paper, we considered a method for optimizing the size of a tank from the condition of minimum material consumption of the housing.The main dependencies and formulas were derived, on the basis of which the calculation was performed. When making calculations, the effect of static load was taken into account without the influence of dynamic factors. Thus, there was a decrease in material costs by about half for the cylindrical wall, cover and bottom.

Keywords: vertical steel tank, important in industry, reducing manufacturing costs, reducing material costs, optimizing sizes, method of optimizing sizes, minimal material consumption