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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">32740</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2022-18-4-297-306</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">Deformation of reinforced concrete frames of multi-storey buildings in extreme conditions under special influences</article-title><trans-title-group xml:lang="ru"><trans-title>Деформирование железобетонных каркасов многоэтажных зданий в запредельных состояниях при особых воздействиях</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5290-3429</contrib-id><name-alternatives><name xml:lang="en"><surname>Kolchunov</surname><given-names>Vitaly I.</given-names></name><name xml:lang="ru"><surname>Колчунов</surname><given-names>Виталий Иванович</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor, Full Member of the Russian Academy of Architecture and Construction Sciences, Head of the Department of Unique Buildings and Structures, Faculty of Construction and Architecture, Southwest State University; Professor of the Department of Reinforced Concrete and Stone Structures, Moscow State University of Civil Engineering (National Research University)</p></bio><bio xml:lang="ru"><p>действительный член Российской академии архитектуры и строительных наук, доктор технических наук, профессор, заведующий кафедрой уникальных зданий и сооружений, факультет строительства и архитектуры, Юго-Западный государственный университет; профессор кафедры железобетонных и каменных конструкций, Национальный исследовательский Московский государственный строительный университет</p></bio><email>asiorel@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8748-5933</contrib-id><name-alternatives><name xml:lang="en"><surname>Bushova</surname><given-names>Olesya B.</given-names></name><name xml:lang="ru"><surname>Бушова</surname><given-names>Олеся Борисовна</given-names></name></name-alternatives><bio xml:lang="en"><p>postgraduate student, Department of Reinforced Concrete and Stone Structures</p></bio><bio xml:lang="ru"><p>аспирант, кафедра железобетонных и каменных конструкций</p></bio><email>bushova96@mail.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><aff-alternatives id="aff2"><aff><institution xml:lang="en">Southwest State University</institution></aff><aff><institution xml:lang="ru">Юго-Западный государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-11-30" publication-format="electronic"><day>30</day><month>11</month><year>2022</year></pub-date><volume>18</volume><issue>4</issue><issue-title xml:lang="en">VOL 18, NO4 (2022)</issue-title><issue-title xml:lang="ru">ТОМ 18, №4 (2022)</issue-title><fpage>297</fpage><lpage>306</lpage><history><date date-type="received" iso-8601-date="2022-11-30"><day>30</day><month>11</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Kolchunov V.I., Bushova O.B.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Колчунов В.И., Бушова О.Б.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Kolchunov V.I., Bushova O.B.</copyright-holder><copyright-holder xml:lang="ru">Колчунов В.И., Бушова О.Б.</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/32740">https://journals.rudn.ru/structural-mechanics/article/view/32740</self-uri><abstract xml:lang="en"><p style="text-align: justify;">In order to increase plasticity during destruction along inclined sections and to protect against progressive collapse of reinforced concrete frames of multi-storey buildings, a variant of cross reinforcement of crossbars in such frames is proposed. The results of a numerical study of the reinforced concrete frame of a multi-storey building with a special impact in the form of an extraordinary hypothetical removal from the work of one of the columns are presented. The modeling of the deformation of the frame is carried out in three versions: the frame of the entire building in the rod setting, a fragment of the building in the column removal zone and a fragment of crossbars adjacent to the column being removed using volumetric finite elements. The obtained results showed the effectiveness of the proposed variant of cross-reinforcement of crossbars to protect a multi-storey frame building from progressive collapse, as well as the effectiveness of using the proposed variant of three-level models for calculating the parameters of static-dynamic deformation of the carcasses of multi-storey buildings under the considered special impacts.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">С целью повышения пластичности при разрушении по наклонным сечениям и защиты от прогрессирующего обрушения железобетонных каркасов многоэтажных зданий предложен вариант перекрестного армирования ригелей в таких каркасах. Приведены результаты численного исследования железобетонного каркаса многоэтажного здания при особом воздействии в виде внезапного гипотетического удаления из работы одной из колонн. Моделирование деформирования каркаса выполнено в трех вариантах: каркас всего здания в стержневой постановке, фрагмент здания в зоне удаления колонны и фрагмент зоны возможного локального разрушения, примыкающей к удаляемой колонне с применением объемных конечных элементов. Полученные результаты показали эффективность предложенного варианта перекрестного армирования ригелей для защиты многоэтажного каркасного здания от прогрессирующего обрушения, а также эффективность использования предложенного варианта уровневых моделей для расчета параметров статико-динамического деформирования каркасов многоэтажных зданий при рассматриваемых особых воздействиях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>reinforced concrete frame</kwd><kwd>building</kwd><kwd>progressive collapse</kwd><kwd>reinforcement</kwd><kwd>inclined rods</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>железобетонный каркас</kwd><kwd>здание</kwd><kwd>прогрессирующее обрушение</kwd><kwd>армирование</kwd><kwd>наклонные стержни</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Almazov V.O., Kao Zui Khoi. Dynamics of progressive destruction of monolithic multi-storey frames. 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