Abstract
The paper discusses the use of lightweight thin-walled structures which make it possible to save resources in steel construction. The highlighted challenges that this industry face in the Russian Federation involve insufficient development of the domestic standards. A thin-walled sigma-profile element with 300 mm in a section height has been studied. The element, its design diagram and loading have been chosen taking into account the structural performance of the columns and girders involved in CFS frameworks. The paper presents analysis technique for a thin-walled profile which performs under axial compression and axial bending compression. The structures have been calculated taking into account their main feature - the initial geometric imperfections. The analysis of the changed effective characteristics and stresses in the cross-section has revealed the significant influence of the initial geometric imperfections of the profiles and location of the extra eccentricity against the element’s initial curvatures. The elastic-plastic behaviour of material occurs when the stresses in the full cross-section achieve 0.71 Ryignoring the initial geometric imperfections, and 0.58 Ry– with regard to them. The paper substantiates the need to consider unevenness of the mechanical properties of steel distributed over the cross-section of the profile. Based on the experimental data obtained, conclusions have been drawn on the necessary adaptation of the indirect method for evaluating the strength characteristics of thin-walled samples.
Highlights
IntroductionRational consumption of non-renewable energy resources is challenging. energy efficiency and energy-savings are the priorities for technological development of the Russian economy
At present, rational consumption of non-renewable energy resources is challenging
The urgency of the study is due to the inefficiency of the state economy, i.e. energy intensity of the gross domestic product (GDP). It is shown in the Energy Savings and Energy Efficiency Program of the Russian Federation for the period until 2020 as 2.5 times higher than the average world level
Summary
Rational consumption of non-renewable energy resources is challenging. energy efficiency and energy-savings are the priorities for technological development of the Russian economy. The Energy Savings Program is a set of measures aimed at reducing energy consumption at all stages of the building life cycle These measures include development of effective design and technical solutions and life support systems, use of alternative energy sources, improvement of the rules and regulations, as well as a number of other resourcesaving measures. Applicability of less resource-demanding structures and the most efficient production technology is one of the ways to reduce energy consumption in the construction industry. Low specific weight of the framework results in reduction of energy consumption for its production This factor makes it possible to significantly reduce the load on the foundation being erected, and the cost of its construction is reduced. Applicability of CFS structures in steel construction is substantiated as a necessary measure that ensures energy savings in this industry
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