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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">10.33979/2073-7416-2023-106-2-4-24</article-id><article-id custom-type="elpub" pub-id-type="custom">construction-596</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>ТЕОРИЯ ИНЖЕНЕРНЫХ СООРУЖЕНИЙ. СТРОИТЕЛЬНЫЕ КОНСТРУКЦИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>THEORY OF ENGINEERING STRUCTURES. BUILDING UNITS</subject></subj-group></article-categories><title-group><article-title>КОМПЛЕКСНАЯ ОЦЕНКА ДЕФОРМАЦИОННОГО ПРОЦЕССА В УСИЛЕННЫХ УГЛЕПЛАСТИКОМ ЖЕЛЕЗОБЕТОННЫХ БАЛКАХ</article-title><trans-title-group xml:lang="en"><trans-title>COMPREHENSIVE ASSESSMENT OF THE DEFORMATION PROCESS OF RC BEAMS STRENGTHENED WITH CFRP SHEET</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>Быков</surname><given-names>Антон Алексеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Bykov</surname><given-names>Anton A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры строительных конструкций и вычислительной механики</p><p>г. Пермь</p></bio><bio xml:lang="en"><p>сandidate of technical science, associate professor of the department of building structures and computational mechanics</p><p>Perm</p></bio><email xlink:type="simple">violentharpy@yandex.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>Шардаков</surname><given-names>Игорь Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Shardakov</surname><given-names>Igor N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, заведующий лабораторией интеллектуального мониторинга</p><p>г. Пермь</p></bio><bio xml:lang="en"><p>doctor of physical and mathematical sciences, professor, head of the Intelligent Monitoring Laboratory</p><p>Perm</p></bio><email xlink:type="simple">shardakov@icmm.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шестаков</surname><given-names>Алексей Петрович</given-names></name><name name-style="western" xml:lang="en"><surname>Shestakov</surname><given-names>Aleksey P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук, научный сотрудник</p><p>г. Пермь</p></bio><bio xml:lang="en"><p>сandidate of physical and mathematical sciences, researcher</p><p>Perm</p></bio><email xlink:type="simple">shap@icmm.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Глот</surname><given-names>Ирина Олеговна</given-names></name><name name-style="western" xml:lang="en"><surname>Glot</surname><given-names>Irina O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук, старший научный сотрудник</p><p>г. Пермь</p></bio><bio xml:lang="en"><p>сandidate of physical and mathematical sciences, senior researcher</p><p>Perm</p></bio><email xlink:type="simple">glot@icmm.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГАОУ ВО «Пермский национальный исследовательский политехнический университет»</institution></aff><aff xml:lang="en"><institution>Perm National Research Polytechnic University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>«Институт механики сплошных сред Уральского отделения Российской академии наук» - филиал Федерального государственного  бюджетного учреждения науки Пермского федерального исследовательского центра Уральского отделения Российской академии наук</institution></aff><aff xml:lang="en"><institution>Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>29</day><month>06</month><year>2023</year></pub-date><volume>0</volume><issue>2</issue><fpage>4</fpage><lpage>24</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Быков А.А., Шардаков И.Н., Шестаков А.П., Глот И.О., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Быков А.А., Шардаков И.Н., Шестаков А.П., Глот И.О.</copyright-holder><copyright-holder xml:lang="en">Bykov A.A., Shardakov I.N., Shestakov A.P., Glot I.O.</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/596">https://construction.elpub.ru/jour/article/view/596</self-uri><abstract><p>В  статье  исследуется  поведение  железобетонных  балок,  усиленных углепластиком,  в  условиях  статического  нагружения.  В  эксперименте  участвовали 22 крупномасштабных  образца  – железобетонные  балки  размером  120х220х1290мм.  Часть образцов  были  усилены  углепластиком  до  нагружения,  часть  в  процессе  нагружения  после получения первых трещин в бетоне и их инъектирования. Нагружение балок производилось по схеме  4-х  точечного  изгиба.  Деформационное  состояние  балок  контролировалось  с  помощью тензометрии  и  прогибомера.  Отслоение  углепластика  оценивалось  методом  инфракрасной термографии непосредственно в процессе нагружения.</p><p>Оценено влияние углепластика на несущую способность и жесткость балок, усиленных до приложения нагрузки и в ходе нагружения. Продемонстрирована способность углепластика сдерживать раскрытие трещин и способность метода усиления углепластиком в сочетании с инъектированием  трещин  восстановить  жесткость  конструкции.  Представлена  картина трещинообразования  в  образцах.  Показано  влияние  качества  подготовки  поверхности  на характер  отслоения  углепластика  и,  как  следствие,  характер  трещинообразования  и разрушения. Определены параметры и особенности отслоения углепластика в зависимости от механизма отслоения. Сопоставлены параметры и интенсивность отслоения углепластика при нагружении  для  балок,  усиленных  в  ненагруженном  состоянии  и  под  нагрузкой.  Выполнено сравнение экспериментальных значений деформаций отслоения, с теоретическими значениями, определенными по 8-ми известным методикам.</p><p>Показано,  что  фактическая  деформация  отслоения  углепластика  на  15-75%  ниже значений,  вычисленных  по  формуле  СП  164.1325800.2014,  а  факт  отслоения  углепластика  не определяет  предельное  состояние  усиленной  железобетонной  балки  при  наличии  надежной анкеровки продольной полосы композита на опорах.</p></abstract><trans-abstract xml:lang="en"><p>The paper investigates the behavior of reinforced concrete beams reinforced with CFRP sheet under static loading. The experiment involved 22 large-scale samples – reinforced concrete beams with a size of 120х220х1290mm. One part of the specimens was reinforced with CFRP before loading, the other – under load after the appearance of the first cracks in concrete and their injection. The beams were loaded according to the 4-point bending scheme. The deformation state of the beams was assessed using strain gauge and deflection meter. The debonding of the carbon fiber sheet was evaluated by infrared thermography directly in the process of loading.</p><p>The effect of CFRP on the bearing capacity and stiffness of beams reinforced before and during loading is evaluated. The ability of CFRP to restrain the opening of a crack was demonstrated.</p><p>The effectiveness of the method of reinforcing beams with CFRP in combination with injection of cracks to restore the rigidity of the structure was evaluated. The pattern of crack formation in samples is presented. The influence of the quality of surface preparation on the nature of the debonding of carbon fiber and the features of cracking and destruction is shown. The parameters and features of CFRP debonding were determined for various debonding mechanisms. The parameters and intensity of CFRP debonding for beams reinforced in the unloaded state and under load are compared. The experimental values of debonding strains are compared with theoretical values determined by 8 known methods.</p><p>It is shown that the actual deformation of CFRP debonding is 15-75% lower than the values calculated in accordance with Russian Building Codes SP 164.1325800.2014, and the fact of CFRP debonding does not determine the limiting state of the reinforced concrete beam in the presence of reliable anchoring of the longitudinal strip of the composite on supports.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>железобетонная балка</kwd><kwd>углепластик</kwd><kwd>усиление железобетонной балки композитным материалом</kwd><kwd>отслоение</kwd><kwd>инфракрасная термография</kwd><kwd>инъектирование трещин</kwd></kwd-group><kwd-group xml:lang="en"><kwd>CFRP sheets</kwd><kwd>composite materials</kwd><kwd>load carrying capacity of RC beams</kwd><kwd>strengthening of RC beams</kwd><kwd>interfacial debonding</kwd><kwd>infrared thermography</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 22-19-00108, https://rscf.ru/project/22-19-00108/</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Esfahani M.R., Kianoush M.R., Tajari A.R. 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