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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Structural Mechanics of Engineering Constructions and Buildings</journal-id><journal-title-group><journal-title xml:lang="en">Structural Mechanics of Engineering Constructions and Buildings</journal-title><trans-title-group xml:lang="ru"><trans-title>Строительная механика инженерных конструкций и сооружений</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1815-5235</issn><issn publication-format="electronic">2587-8700</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">46936</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2025-21-4-321-333</article-id><article-id pub-id-type="edn">CGZOGJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Analysis and design of building structures</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Расчет и проектирование строительных конструкций</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Stages of Resistance of Reinforced Concrete Frames in Accidental Design Situation</article-title><trans-title-group xml:lang="ru"><trans-title>Стадии напряженно-деформированного состояния железобетонных каркасов зданий в аварийной расчетной ситуации</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6697-3388</contrib-id><contrib-id contrib-id-type="spin">1301-4838</contrib-id><name-alternatives><name xml:lang="en"><surname>Savin</surname><given-names>Sergei Yu.</given-names></name><name xml:lang="ru"><surname>Савин</surname><given-names>Сергей Юрьевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Reinforced Concrete and Masonry Structures</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры железобетонных и каменных конструкций</p></bio><email>suwin@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Moscow State University of Civil Engineering (National Research University)</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Московский государственный строительный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-11-05" publication-format="electronic"><day>05</day><month>11</month><year>2025</year></pub-date><volume>21</volume><issue>4</issue><issue-title xml:lang="en">VOL 21, NO4 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 21, №4 (2025)</issue-title><fpage>321</fpage><lpage>333</lpage><history><date date-type="received" iso-8601-date="2025-11-05"><day>05</day><month>11</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Savin S.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Савин С.Ю.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Savin S.Y.</copyright-holder><copyright-holder xml:lang="ru">Савин С.Ю.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/46936">https://journals.rudn.ru/structural-mechanics/article/view/46936</self-uri><abstract xml:lang="en"><p>The study addresses the stress-strain state stages of reinforced concrete frames in zones of potential local collapse due to failure of a vertical element, such as a column or pylon. The paper provides initial assumptions about the mechanisms of secondary failure propagation in multi-storey reinforced concrete building frames, depending on the initial local collapse scenario. Based on these assumptions, the paper formulates force and deformation criteria for the stress-strain state stages of reinforced concrete building frames in the zone of potential local collapse. Using energy balance conditions, simplified relations were developed to estimate the ultimate static load for compressive arch and catenary actions of floor slab structures. The calculated force and deformation criteria values were compared with the experimental values. These comparisons demonstrate that the accuracy of the proposed relations is acceptable for engineering calculations.</p></abstract><trans-abstract xml:lang="ru"><p>Исследованы стадии напряженно-деформированного состояния железобетонных рамных конструкций каркасов зданий в зоне возможного локального разрушения при потере несущей способности одного из вертикальных элементов (колонны, пилона). Приведены исходные предпосылки о механизмах распространения вторичных разрушений в железобетонных многоэтажных каркасах зданий в зависимости от сценария начального локального разрушения. На основе этого сформулированы силовые и деформационные критерии стадий напряженно-деформированного состояния железобетонных рамных конструкций каркасов зданий в зоне возможного локального разрушения. С использованием положений энергетического баланса построены упрощенные зависимости для оценки предельной статической нагрузки для арочной и цепной стадий напряженно-деформированного состояния конструкций перекрытий. Приведены результаты сопоставления расчетных значений силовых и деформационных критериев с экспериментальными данными. Продемонстрирована приемлемая для инженерных расчетов точность предложенных в работе зависимостей.</p></trans-abstract><kwd-group xml:lang="en"><kwd>compressive arch action</kwd><kwd>catenary action</kwd><kwd>reinforced concrete frame</kwd><kwd>structure</kwd><kwd>progressive collapse</kwd><kwd>robustness</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>арочная стадия</kwd><kwd>цепная стадия</kwd><kwd>железобетонная рама</kwd><kwd>каркас</kwd><kwd>прогрессирующее обрушение</kwd><kwd>живучесть</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 24-49-10010, https://rscf.ru//project/24-49-10010/</institution></institution-wrap><institution-wrap><institution xml:lang="en">The research was carried out with the support of the grant of the Russian Science Foundation No. 24-49-10010, https://rscf.ru//project/24-49-10010/</institution></institution-wrap></funding-source></award-group></funding-group></article-meta><fn-group/></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Pham A.T., Tan K.H. 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