Volodymyr Vasylev, Andrei Mironov, Anna Bezushko
Stress-Strain State of a Structural Construction with Allowance for Fastening elements
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article presents the results of the calculation of the nodal connection of the spatial block of the structural covering of an industrial building. A detailed technique for performing the calculation of a junction connection in a spatial setting using the Lira software is described. The stages of checking the adequacy of the design scheme for the real constructive form of the node are given. Based on the results of the calculations, conclusions were drawn and the goals and objectives of the experimental study of the nodal connection of the structural coating were determined. Adequacy (mathematics) is the correspondence, the coincidence of any parameters, satisfactory from the point of view of certain goals.
Keywords: structural coating, nodal connection, shape, stress-deformable state.
Yaroslav Huk, Ivan Naybauer, Elvira Novak, Aleksandr Huk
Method of Calculation of Maximum Snow Loads on the Horizontal Area on the Territory of the Transcarpathian Region by Rendered Forms
Uzhgorod National University
Abstract. The domestic scientists at the early stage of research revealed that maximum snow loads for the territory of the Transcarpathian region were determined only by the initial data of the snow cover of the III climatic zone, and later, by separate observations on the meteorological stations, in recent years, by observations in 1948–2015 at 9 meteorological stations of the Transcarpathian region and 23 directions between meteorological stations and transition stations with application of altitude and altitude-logarithmic coefficients. In this publication 8 directions were used (for maximum snow densities), 16 directions (for maximum snow cover heights) between 8 meteorological stations with elevations above the Baltic Sea level: Beregovo – 113 m, Uzhhorod – 114.6 m, Great Berezny – 209 m, Rakhiv – 438 m, Mizhhirya – 456 m, Lower Gate – 500 m, Lower Studeny – 615 m and the ultimate meteorological station of Plai – 1 330 m, high-altitude coefficients, horizontal topographic maps in intervals of 100 m. Based on the above data, simplified formulas for maximum snow parameters were derived: snow cover heights, snow densities of maximum snow loads on a horizontal plane.
Keywords: meteorological stations, maximum height and density of snow cover, maximum snow load on a horizontal plane, simplified formulas of maximum snow parameters, horizontal topographic maps.
Anatoliy Yugov, Anna Ihno, Andrei Mironov, Sergey Titkov
Modeling of the Stress-Strain State of Metal Structures of the Glass Melting Furnace in Transitional States when it is Put into Operation
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article presents modeling of the stress-strain state of furnace strapping frame. It was described the method of constructing the design scheme of the bathroom glass melting furnace at its commissioning. Spatial calculation model is as close as possible to the real structure of the object. It was designed the algorithm of collecting loads in a system framework implementation data in a computer system. A feature of the estimated model is non-stationary mode and technological methods in the operation of a real object, the increased temperature of operation of structures, including the joint work of the metal framework and the refractory lining of the furnace when it is significant shrinkage. Estimated combinations of loads are made for each of the stages of the furnace introduction into operation. Numerical values of the actual stress-strain state of the metal frame of the furnace during the commissioning are obtained. On the basis of the experimental data, a comparative analysis of the obtained values with the values of the analytical calculation of the furnace model in the LIRA-CAD PC was made. The technique of entering into the calculation scheme for the dissolution of strings of the furnace roof was developed.
Keywords: design model, metal frame, glass furnace, loads, calculated combinations, stress-strain state, cross-section deformation, torsion.
Alexey Solohnenko, Igor Romensky
The Choice of Rational Parameters of Frames of Variable Rigidity, While Using Genetic Algorithm Optimization
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article deals with the use of the genetic optimization algorithm for selecting rational parameters of variable-rigidity metal frames (variable cross-section). An example of the simplest genetic algorithm on the block diagram has been given. The essence of this algorithm, its conceptual apparatus, the operating principle and the main problems of its use has been described. An example of the implementation of the simplest algorithm for finding the optimal solution for a variable-rigidity frame with a span of 9 variable parameters has been given.
Keywords: optimization, genetic algorithm, metal frame variable rigidity, iteration, optimum, generation, vector of variable parameters.