concconcЖелезобетонные конструкцииReinforced concrete structures2949-16222949-1614Национальный исследовательский Московский государственный строительный университет10.22227/2949-1622.2024.3.12-23concconc-55Research ArticleТЕОРИЯ БЕТОНА И ЖЕЛЕЗОБЕТОНАTHEORY OF CONCRETE AND REINFORCED CONCRETEУстойчивость железобетонных колонн, подверженных сжатию с кручением в особой расчетной ситуацииStability of Reinforced Concrete Columns Subjected to Compression with Torsion under Accidental Actionhttps://orcid.org/0000-0001-5290-3429КолчуновВ. И.KolchunovV. I.

Виталий Иванович Колчунов, академик РААСН, профессор, доктор технических наук, профессор кафедры железобетонных и каменных конструкций

129337, г. Москва, Ярославское шоссе, д. 26

Scopus: 55534147800, ResearcherID: J-9152-2013

Vitaly I. Kolchunov, Full Member of RAACS, Professor, Doctor of Technical Sciences, Professor of the Department of Reinforced Concrete and Masonry Structures

26 Yaroslavskoe shosse, Moscow, 129337

Scopus: 55534147800, ResearcherID: J-9152-2013

asiorel@mail.ruhttps://orcid.org/0000-0002-6697-3388СавинС. Ю.SavinS. Yu.

Сергей Юрьевич Савин, кандидат технических наук, доцент, доцент кафедры железобетонных и каменных конструкций

129337, г. Москва, Ярославское шоссе, д. 26

Scopus: 57052453700, ResearcherID: M-8375-2016

Sergei Yu. Savin, Candidate of Technical Sciences, Associate Professor, Associate Professor of the Department of Reinforced Concrete and Masonry Structures

26 Yaroslavskoe shosse, Moscow, 129337

Scopus: 57052453700, ResearcherID: M-8375-2016

suwin@yandex.ruАмелинаМ. А.AmelinaM. A.

Маргарита Андреевна Амелина, аспирант кафедры железобетонных и каменных конструкций

129337, г. Москва, Ярославское шоссе, д. 26

Margarita A. Amelina, postgraduate student of the Department of Reinforced Concrete and Masonry Structures

26 Yaroslavskoe shosse, Moscow, 129337

margo.dremova@mail.ruНациональный исследовательский Московский государственный строительный университет (НИУ МГСУ)РоссияMoscow State University of Civil Engineering (National Research University) (MGSU)Russian Federation202427092024731223Copyright © Колчунов В.И., Савин С.Ю., Амелина М.А., 20242024Колчунов В.И., Савин С.Ю., Амелина М.А.Kolchunov V.I., Savin S.Y., Amelina M.A.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.g-b-k.ru/jour/article/view/55

Изучено влияние процента армирования и класса прочности бетона по сжатию на устойчивость железобетонных элементов при различных соотношениях продольной силы и крутящего момента. Для целей исследования использовано численно-аналитическое решение для стержневых железобетонных элементов, учитывающее изменение жесткости при комбинированном действии продольной сжимающей силы и крутящего момента с учетом нелинейной связи между напряжениями и деформациями по Model Code и изменения прочности и деформативности бетона при сложном напряженно-деформированном состоянии по модели Г.А. Гениева. Для исследуемых железобетонных элементов построены границы области устойчивости при комбинированном действии продольной сжимающей силы и крутящего момента. Показано, что при комбинированном нагружении продольной силой и крутящим моментом для малых значений продольной силы N следует ожидать разрушение от потери прочности сечений при действии крутящего момента Mt. Для подверженных сжатию с кручением элементов из бетонов разных классов прочности по сжатию, но с близкими значениями эффективного процента армирования αs, установлено снижение безразмерной продольной силы αn и безразмерного крутящего момента αm по мере роста класса прочности бетона.

The effect of reinforcement ratio and compressive strength of concrete on the stability of reinforced concrete elements at different ratios of longitudinal force to torque is examined. For the purposes of the study, an analytical solution is used for reinforced concrete bars, which takes into account the change in stiff-ness under the combined action of axial compressive force and torque, considering the nonlinear relationship between stresses and strains according to Model Code and the change in strength and deformability of concrete under complex stress-strain state according to the model of G.A. Geniev. For the reinforced concrete elements considered in the study, the stability region boundaries for the combined action of the axial compressive force and torque are plotted. It is shown that at combined loading by axial force and torque for small values of axial force N one should expect failure due to loss of strength of sections under the action of torque Mt. For elements made of concrete of different compressive strength classes, but with close values of effective reinforcement ratio αs, the dimensionless axial force αn and dimensionless torque αm decrease as the concrete strength class increases.

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