2019
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Browsing 2019 by Author "Bannikov, Dmytro O."
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Item Outlooks of Using DBN B.2.6-161:2017 «Wooden Structures» in Design Practice(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Bannikov, Dmytro O.EN: Purpose. From 01.02.2018, the new state standards DBN B.2.6-161:2017 were introduced into the wooden structures design practice. They replace the recently prepared codes DBN B.2.6-161:2010, which, in turn, were elaborated to replace the SNiP II-25-80. The author of this publication would like to draw the attention of develop-ers and potential users of the codes DBN B.2.6-161:2017 to the points that are not entirely clear, which at first read-ing caused him certain difficulties in terms of their practical use. Methodology. The practical experience accumu-lated by the author in the use of normative literature in educational practice, as well as the available experience dur-ing laboratory studies with students, made it possible to estimate the recently introduced codes DBN B.2.6-161:2017 from a practical point of view. Findings. In general, the new codes, recently introduced into design practice, are progressive both in their content and in terms of their use in construction practice. However, the existing problem areas in these standards, which are considered in this publication, in our opinion, can significantly limit the possibil-ity of their wide practical application. Originality. The analysis of recently introduced new standard was carried out by the author of the publication not only in terms of assessing quality requirements and recommendations, but also in terms of the quantitative aspect of the issue. Practical value. The author’s experience in calculating simple ele-ments and basic types of connections according to the new codes DBN B.2.6-161:2017 indicates that the bearing capacity determined for various cases is lower on average by 1.5 – 3 times than according to the previous codes SNiP II-25-80. From a practical point of view, this revealed discrepancy means that the already constructed struc-tures may require some reinforcement or reconstruction, and new designed structures should have large bearing sec-tions of the elements and, accordingly, large bearing capacity and weight.Item Rational Design of Short-Span Industrial Building Roof for Reconstruction Conditions(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Kruhlikova, Nadija G.; Bannikov, Dmytro O.EN: Purpose. Recently, the demand for reuse of industrial buildings that have not been in operation for some time has been increasing in Ukraine. Herewith, quite often the design of their roof requires the complete replacement and renovation by using modern roofing materials to meet the requirements of new government standards. Therefore, the choice and justification of the rational design of steel roof on the example of a short-span industrial building (18-24 m span), which is planned to be returned to exploitation after idle time, is the main goal of this publication. The object of the analysis is an unheated building equipped with bridge cranes of a small capacity (up to 10 tons). Methodology. To achieve this purpose, the comparison of structural variants of a roof steel collar tie was per-formed. Such variants include two types of collar tie cross-section – a lattice truss and a solid I-girder. The first type was analyzed for four possible types of section of elements – double angles, a roll-welded square profile, an electric-welded round tube and a rolled round tube. The second type was analyzed for two possible types of section – rolled I-section made of normal strength steel and fabricated sections of thin-gage high-strength steel. The design variants were compared on the basis of a numerical analysis of their work using the finite element method based on the soft-ware complex SCAD for Windows. Findings. According to the research results it should be stated that for the con-ditions of the city of Dnipro the most cost-effective variant of the steel collar tie cross section for the short-span in-dustrial building is the truss made of electric-welded round tubes. Also the construction of collar tie made of roll-welded square profiles or fabricated section of thin-gage high-strength steel is considered quite effective. Originality. The research presented in the publication allows estimating the possibility and economic efficiency of usage for various types of cross-sections for the collar tie of a steel non-insulated roof of the industrial building for the reconstruction conditions in the Dnipro-city. Practical value. A practical estimation of mass and cost parameters for steel collar ties of various types has been carried out, and the methodology for conducting such estimation has been substantiated.