Structural Mechanics of Engineering Constructions and BuildingsStructural Mechanics of Engineering Constructions and BuildingsСтроительная механика инженерных конструкций и сооружений1815-52352587-8700Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)2071510.22363/1815-5235-2019-15-1-25-32Analysis and design of building structuresРасчет и проектирование строительных конструкцийResearch ArticleA comparative study of beam design curves against lateral torsional buckling using AISC, EC and SPСравнение расчетных кривых балки с боковым крутильным изгибом с использованием AISC, EC и СПGalishnikovaVera VГалишниковаВера Владимировна

Associate Professor, Director of the Department of Civil Engineering, Engineering Academy

доктор технических наук, директор департамента cтроительства Инженерной академии

galishni@gmail.comGebreTesfaldet HГебреТесфалдет Хадгембес

PhD student of the Department of Civil Engineering, Engineering Academy

аспирант департамента строительства Инженерной академии

tesfaldethg@gmail.comPeoples' Friendship University of Russia (RUDN University)Российский университет дружбы народов15122019151VOL 15, NO1 (2019)ТОМ 15, №1 (2019)253213032019Copyright ©; 2019, Galishnikova V.V., Gebre T.H.Copyright ©; 2019, Галишникова В.В., Гебре Т.Х.2019Galishnikova V.V., Gebre T.H.Галишникова В.В., Гебре Т.Х.http://creativecommons.org/licenses/by/4.0https://journals.rudn.ru/structural-mechanics/article/view/20715

Introduction. Structural stability is an essential part of design process for steel structures and checking the overall stability is very important for the determination of the optimum steel beams section. Lateral torsional buckling (LTB) normally associated with beams subject to vertical loading, buckling out of the plane of the applied loads and it is a primary consideration in the design of steel structures, consequently it may reduce the load currying capacity. Methods. There are several national codes to verify the steel beam against LTB. All specifications have different approach for the treatment of LTB and this paper is concentrated on three different methods: America Institute of Steel Construction (AISC), Eurocode (EC) and Russian Code (SP). The attention is focused to the methods of developing LTB curves and their characteristics. Results. AISC specification identifies three regimes of buckling depending on the unbraced length of the member ( Lb ). However, EC and SP utilize a reduction factor (χ LT ) to treat lateral torsional buckling problem. In general, flexural capacities according to AISC are higher than those of EC and SP for non-compact sections.

Цель исследования. Расчет на устойчивость является неотъемлемой частью проектирования стальных конструкций. Он очень важен для определения оптимального поперечного сечения стальных балок. Поперечное боковое выпучивание обычно происходит у балок, которые подвержены вертикальной нагрузке и теряют устойчивость из плоскости приложения нагрузок. Это является основным фактором при проектировании стальных конструкций и может привести к снижению несущей способности. Методы. Существуют различные методы расчета стальной балки на поперечное боковое выпучивание. Все нормы расчета по-разному подходят к исследованию поперечное-бокового выпучивания, в данной статье внимание сконцентрировано на трех из них. Первый метод предложен Американским институтом стальных конструкций (AISC), второй описан в Еврокоде (ЕС), третий приводится в российских строительных правилах (СП). Особое внимание уделено методам построения кривых для поперечного бокового выпучивания и определения их характеристик. Результаты. Нормы, разработанные Американским институтом стальных конструкций, рекомендуют рассматривать три режима потери устойчивости, зависящие от длины элементов ( Lb ). Однако ЕC и СП дают уменьшение XLT и предохраняют конструкцию от поперечного бокового выпучивания. В основном изгибная жесткость для поперечных сечений с высокими стенками согласно AISC выше, чем в ЕС и СП.

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