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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">construction</journal-id><journal-title-group><journal-title xml:lang="ru">Строительство и реконструкция</journal-title><trans-title-group xml:lang="en"><trans-title>Building and Reconstruction</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-7416</issn><publisher><publisher-name>Орловский государственный университет имени И.С. Тургенева</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.33979/2073-7416-2025-122-6-2</article-id><article-id custom-type="elpub" pub-id-type="custom">construction-980</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>БЕЗОПАСНОСТЬ ЗДАНИЙ И СООРУЖЕНИЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BUILDING AND STRUCTURE SAFETY</subject></subj-group></article-categories><title-group><article-title>Деформирование приопорных зон ригелей железобетонных рамных каркасов в запредельных состояниях</article-title><trans-title-group xml:lang="en"><trans-title>Multi-stage deformation of plastic hinges in RC frame beams at accidental actions</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Савин</surname><given-names>С. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Savin</surname><given-names>S. Y.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Савин Сергей Юрьевич, кандидат технических наук, доцент, доцент кафедры железобетонных и каменных конструкций</p><p>г. Москва</p></bio><bio xml:lang="en"><p>Savin Sergey Yu., Сandidate of Tech. Sc., associate professor of the department of Reinforced Concrete and Masonry Structures</p><p>Moscow</p></bio><email xlink:type="simple">savinsyu@mgsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лизогуб</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Lizahub</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лизогуб Александр Александрович, м.т.н., младший научный сотрудник ОЛ «НИЦИС»</p><p>г. Брест</p></bio><bio xml:lang="en"><p>Aliaksandr Al. Lizahub, master of eng. science, junior research fellow of BL «RCIC»</p><p>Brest </p></bio><email xlink:type="simple">p_332_14lizogub@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет»</institution></aff><aff xml:lang="en"><institution>National Research Moscow State University of Civil Engineering</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Брестский государственный технический университет</institution></aff><aff xml:lang="en"><institution>Brest State Technical University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>15</day><month>12</month><year>2025</year></pub-date><volume>0</volume><issue>6</issue><fpage>36</fpage><lpage>46</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Савин С.Ю., Лизогуб А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Савин С.Ю., Лизогуб А.А.</copyright-holder><copyright-holder xml:lang="en">Savin S.Y., Lizahub A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://construction.elpub.ru/jour/article/view/980">https://construction.elpub.ru/jour/article/view/980</self-uri><abstract><p>В современных условиях возрастает риск аварийных воздействий на здания, что делает традиционные стратегии проектирования, основанные на исключении таких воздействий или проектировании ключевых элементов, недостаточно эффективными и экономически неоправданными. Наиболее перспективным подходом является обеспечение живучести конструкций путем ограничения масштабов обрушения после начального локального разрушения. Целью исследования является разработка расчетной модели сопротивления приопорного участка ригеля железобетонного рамного каркаса здания при многоуровневом деформировании в запредельном состоянии, возникающем в результате аварийной ситуации. Приводится обоснование выбора физической модели сопротивления в виде конструктивного узла с приопорными участками ригелей и колонн. Разработана расчетная модель сопротивления приопорных участков ригелей железобетонного рамного каркаса здания при многоуровневом деформировании в запредельном состоянии, возникающем в результате аварийной ситуации. Получены аналитические выражения для характерных точек диаграммы «Момент – угол поворота в пластическом шарнире» при работе конструкций перекрытия над местом начального локального разрушения по изгибной и арочной схемам, а также диаграммы «Продольная сила – удлинение» при работе по цепной схеме. Предложенный подход позволяет оценить несущую способность железобетонных каркасов в запредельных состояниях, возникающих после аварийного воздействия. Полученные результаты могут быть использованы для практического расчета и проектирования конструкций, направленного на повышение их живучести.</p></abstract><trans-abstract xml:lang="en"><p>The risk of accidental damage to buildings is currently increasing. This makes traditional design strategies, which focus on eliminating such impacts or designing key elements, ineffective and economically unreasonable. The most promising approach is to ensure the robustness of structures by limiting the extent of collapse after initial local failure. The goal of this study is to develop a calculation model for the resistance of a beam support section of a reinforced concrete frame under multi-level deformation in an accidental situation. The rationale for selecting a physical resistance model in the form of a structural node with support sections of beams and columns is explained. A calculation model has been developed to determine the resistance of support sections of beams in a reinforced concrete frame building under multi-level deformation in an extreme state resulting from an accidental situation. Analytical expressions have been obtained for the characteristic points of the "moment-rotation angle in a plastic hinge" diagram for flexural and compressive arch action, as well as for the "axial force-elongation" diagram for tensile catenary action. The proposed approach enables the evaluation of the load-bearing capacity of reinforced concrete frames under extreme conditions resulting from accidental events. The results of the study can be used to design structures that are more robust.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>живучесть</kwd><kwd>прогрессирующее обрушение</kwd><kwd>арочная стадия</kwd><kwd>цепная стадия</kwd><kwd>железобетон</kwd><kwd>каркас</kwd><kwd>узел</kwd></kwd-group><kwd-group xml:lang="en"><kwd>robustness</kwd><kwd>progressive collapse</kwd><kwd>compressive arch action</kwd><kwd>tensile catenary action</kwd><kwd>reinforced concrete</kwd><kwd>frame</kwd><kwd>joint</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 24-49-10010,  https://rscf.ru//project/24-49-10010/  Исследование выполнено в рамках гранта Белорусского республиканского фонда фундаментальных исследований № Т23РНФМ-060.</funding-statement><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation grant No. 24-49-10010, https://rscf.ru//project/24-49-10010/. 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