constructionСтроительство и реконструкцияBuilding and Reconstruction2073-7416Орловский государственный университет имени И.С. Тургенева10.33979/2073-7416-2024-114-4-75-89construction-776Research ArticleБЕЗОПАСНОСТЬ ЗДАНИЙ И СООРУЖЕНИЙBUILDING AND STRUCTURE SAFETYУстойчивость сжатых металлических элементов при комбинированных температурных и сейсмических воздействияхStability of compressed metal elements under combined temperature and seismic effectsМацеевичТ. А.MatseevichT. A.

Мацеевич Татьяна Анатольевна, доктор физико-математических наук, профессор кафедры железобетонных и каменных конструкций; ведущий научный сотрудник

Москва

Tatyana A. Matseevich, Doctor of Physical and Mathematical Sciences, Associate Professor, Professor of the Department of Reinforced Concrete and Stone Structures; Leading Researcher

Moscow

MatseevichTA@mgsu.ruШкарповаО. Г.ShkarpovaO. G.

Шкарпова Ольга Геннадьевна, магистр

Москва

Olga G. Shkarpova, Master's graduate

Moscow

olya.shkarpova@yandex.ruСаиянС. Г.SaiyanS. G.

Саиян Сергей Гургенович, аспирант кафедры сопротивления материалов; младший научный сотрудник

Москва

Sergey G. Saiyan, postgraduate student of the Department of Resistance of Materials; Junior Researcher

Moscow

Berformert@gmail.comФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет» (НИУ МГСУ); Институт проблем механики им. А.Ю. Ишлинского Российской академии наук (ИПМех РАН)National Research Moscow State University of Civil Engineering (NRU MGSU); Ishlinsky Institute for Problems in Mechanics of the Russian Academy of SciencesФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет» (НИУ МГСУ)National Research Moscow State University of Civil Engineering (NRU MGSU)202401092024047589Copyright © Мацеевич Т.А., Шкарпова О.Г., Саиян С.Г., 20242024Мацеевич Т.А., Шкарпова О.Г., Саиян С.Г.Matseevich T.A., Shkarpova O.G., Saiyan S.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://construction.elpub.ru/jour/article/view/776

Землетрясения вызывают горизонтальные и вертикальные ускорения земной поверхности, что может привести к повороту и изгибу конструкций. Колонны, как элементы строительных конструкций, подвержены воздействию сейсмических сил, что может вызывать их кручение. Также при землетрясениях одной из наиболее серьезных угроз для зданий и сооружений является возможность возникновения пожаров. Поэтому вопросы исследования устойчивости сжатых металлических элементов с кручением при температурном воздействии являются весьма важными для сейсмических районов. В работе получены методики аналитического и численного расчета для определения устойчивости сжатых металлических элементов с кручением при температурном воздействии.

Расчетный анализ проводится на основе методов численного моделирования в программном комплексе ANSYS Mechanical. В качестве испытуемой конструкции разработана модель стальной колонны из двутавра, выполненной из стали С355. Для проведения теплового расчета использовался модуль "Transient Thermal" посредством приложения к обогреваемым поверхностям температурного нагружения, изменяющегося по времени. Нагрев колонны производится по стандартной температурной кривой газовой среды в условиях пожара. Для выполнения аналитического расчета разработаны программы для расчетов в ПК Matlab. Алгоритм аналитического расчета потери устойчивости сжатого элемента при температурном воздействии основан на определении коэффициента снижения модуля упругости и температуры нагрева, соответствующие подобранному промежуточному значению температурного коэффициента снижения предела текучести.

Приведены сравнительные графики изменения критической температуры от действия нагрузки при численном и аналитическом расчете и диаграммы понижения критической силы при температурном воздействии.

Разработаны методики численного и аналитического расчета устойчивости сжатого элемента с кручением при огневом воздействии в ПК Ansys и Matlab.

Аrthquakes cause horizontal and vertical accelerations of the earth's surface, which can lead to the rotation and bending of structures. Columns, as elements of building structures, are subject to seismic forces, which can cause them to twist.

Additionally, one of the most serious threats to buildings and structures during earthquakes is the possibility of fires. Therefore, the issues of studying the stability of compressed metal elements with torsion under temperature effects are very important for seismic regions. The study presents methodologies for analytical and numerical calculations to determine the stability of compressed steel elements and compressed steel elements with torsion under temperature effects.

The calculation analysis is carried out based on numerical simulation methods in the software complex ANSYS Mechanical. A model of a steel column made of S355 steel, designed as a double T-beam, was developed as the test construction. A "Transient Thermal" module type was used for conducting the thermal analysis by applying temperature loading those changes over time to the heated surfaces. The heating of the column is performed according to the standard temperature curve of the gas environment in fire conditions. For analytical calculations, programs were developed for calculations in the PC Matlab. The algorithm for analytically calculating the loss of stability of a compressed element under temperature effects is based on determining the coefficient of reduction of the modulus of elasticity and the heating temperature corresponding to the selected intermediate value of the temperature coefficient of reduced yield strength.

Comparative graphs showing the change in critical temperature due to load action in numerical and analytical calculations, as well as diagrams depicting the decrease in critical force under temperature effects, are provided.

Methodologies for numerical and analytical calculations of the stability of a compressed element with torsion under fire exposure in ANSYS and Matlab have been developed.

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The authors declare that there are no conflicts of interest present.