Andrey Alyokhin, Anton Burdel
Comparative Analysis of the Calculation of an I-Beam Cross-Section Beam According to Eurocode 3 and SNiP II-23-81*
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article presents a comparative analysis of the beams of the I-beam cross-section according to Eurocode 3: “Steel structures” [1] and SNiP II-23-81* “Steel structures” [6]. The object of investigation was a beam of an I-section of 17.5 m in a frame-bonded frame. Based on the maximum effort received (Mmax = 2130 kNm, Qmax = 690 kN, Nmax = -147 kN) [14], the beam heights from 1090 to 1690 mm were accepted with walls from 4 to 8 mm thick according to the existing grade of metal roll GOST 19903- 74* “Rolled hot-rolled sheet” [8] and GOST 82-70* “Rolled steel hot-rolled broadband universal” [9]. Comparison of beam calculation methods is carried out. The boundary conditions determining the staging of the wall operation are considered. According to the calculation results, the metal capacities of the beams are determined depending on the height and wall thickness, and also the step of the transverse stiffeners according to [1] and [6]. The optimum thickness and height of the beam wall, as well as the required step of the transverse stiffeners, are determined. The analysis of the obtained values is carried out and the main factors influencing metal intensity of the beam are determined.
Keywords: Beam of overlap, 4 class of section, beam with flexible wall, effective area, local stability, transverse stiffeners, yield point, I-section, elastic work of the material.
Viktor Iarkin, Tatyana Morozova, Kateryna Bryzhata
Influence of Forced Displacement of Earth Surface in Undermining Area on the Stress-Strain State of Multistoried Frame Building
Donbas National Academy of Civil Engineering and Architecture
Abstract. In the article the analysis by the influence of forced displacement of earth surface in an undermining area to additional forces distribution in the elements of multistoried frame building with different rigidity of base and different construction solution of the frame of building is done. The method of clarifying the forced displacements of earth surface by the results of geodesic monitoring is considered. Recommendations are given for changing rigidity of base during the process of use of a building to reduce the additional forces in the frame elements caused by underworking.
Keywords: undermining area, base rigidity index, forced displacements of earth surface, additional forces.
Andrei Myronov, Igor Garanja, Sergey Osipov
Determination of the Stress Concentration Coefficient in the Anchor’s Area of Composite Span Structures of the Road Bridges
Donbas National Academy of Civil Engineering and Architecture
Abstract. The article presents the results of analysis of the tensely-deformed state of a five-span steel-reinforced concrete structure of a road bridge, made on a beam unbroken circuit. The calculation is performed in the LIRA computational complex under the elastic work of materials on the action of shearing and tearing forces. The main purpose of the work was to determine the coefficient of stress concentration in the zone of rigid stops for concrete slabs of the roadway. For this purpose, a section of a plate with a metal beam and unifying elements was modeled, broken down into small volumetric and lamellar bodies. This allowed us to analyze in detail the nature of the distribution of normal stresses along the height and length of the span structure. The obtained coefficient can be used when calculating the existing designs for endurance and strength, and also when determining the residual life of bridge structures to predict their service life.
Keywords: span structures of road bridges, steel structures, concentration of tensions, hard support, normal tensions.
Volodymyr Mushchanov, Hanna Zubenko, Andrey Drozdov
Investigation of Aerodynamic Coefficients of Sagging Membrane Coatings of Engineering Structures
Donbas National Academy of Civil Engineering and Architecture
Abstract. The publication examines the results of scientific research and regulatory documents on the impact of wind load on structures with a circular cylindrical surface, namely, vertical cylindrical tanks of large volumes. Using the example of a reservoir with a volume of 20 thousand m3, the aerodynamic coefficients for the concave membrane roof of the reservoir for the model at a scale of 1: 320 were obtained. By purging in the DonNACA MAT wind tunnel, verification calculations for the model in the Solid Works Flow Simulation software package were performed. Aerodynamic coefficients for a 1: 1 scale reservoir in Solid Works for an isolated reservoir and for a reservoir in a group of 4 objects were obtained.
Keywords: wind tunnel, aerodynamic coefficient, vertical cylindrical tank.