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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">concconc</journal-id><journal-title-group><journal-title xml:lang="ru">Железобетонные конструкции</journal-title><trans-title-group xml:lang="en"><trans-title>Reinforced concrete structures</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2949-1622</issn><issn pub-type="epub">2949-1614</issn><publisher><publisher-name>Национальный исследовательский Московский государственный строительный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22227/2949-1622.2023.3.49-61</article-id><article-id custom-type="elpub" pub-id-type="custom">concconc-23</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 БЕТОНА И ЖЕЛЕЗОБЕТОНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>THEORY OF CONCRETE AND REINFORCED CONCRETE</subject></subj-group></article-categories><title-group><article-title>Влияние уровня нагрузки усиления на несущую способность железобетонных балок, внешне армированных углепластиком</article-title><trans-title-group xml:lang="en"><trans-title>Influence of Reinforcement Load Level on Bearing Capacity of RC Beams Externally Reinforced with СFRP</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2182-2049</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Смоляго</surname><given-names>Геннадий Алексеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Smolyago</surname><given-names>Gennadiy A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>советник РААСН, д-р техн. наук, профессор, профессор кафедры СиГХ</p></bio><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor, Professor of the Department of Constraction and Urban Economics</p></bio><email xlink:type="simple">tpk-psv@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>Жданов</surname><given-names>Александр Егорович</given-names></name><name name-style="western" xml:lang="en"><surname>Zhdanov</surname><given-names>Alexander E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., доц., ведущий конструктор</p></bio><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor, Lead Engineer</p></bio><email xlink:type="simple">zd-54@list.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5294-3586</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Обернихина</surname><given-names>Яна Леонидовна</given-names></name><name name-style="western" xml:lang="en"><surname>Obernikhina</surname><given-names>Yana L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ст. пр. кафедры СиГХ</p></bio><bio xml:lang="en"><p>Senior Lecturer of the Department of Constraction and Urban Economics</p></bio><email xlink:type="simple">yana.ishuk@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белгородский государственный технологический университет им. В.Г. Шухова (БГТУ им. В.Г. Шухова)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Belgorod State Technological University named after V.G. Shukhov</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ООО Строительная экспертиза</institution><country>Россия</country></aff><aff xml:lang="en"><institution>OOO Stroitelnaya ekspertiza</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>19</day><month>07</month><year>2023</year></pub-date><volume>3</volume><issue>3</issue><fpage>49</fpage><lpage>61</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Смоляго Г.А., Жданов А.Е., Обернихина Я.Л., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Смоляго Г.А., Жданов А.Е., Обернихина Я.Л.</copyright-holder><copyright-holder xml:lang="en">Smolyago G.A., Zhdanov A.E., Obernikhina Y.L.</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://www.g-b-k.ru/jour/article/view/23">https://www.g-b-k.ru/jour/article/view/23</self-uri><abstract><p>В большинстве экспериментальных исследований, посвященных изучению НДС изгибаемых железобетонных элементов, усиленных полимеркомпозитными материалами на основе углеволокна, рассматриваются лишь ненагруженные или не имеющие предварительных трещин балки. Однако усиление реальных несущих конструкций чаще всего выполняют под нагрузкой и с учетом ранее возникших дефектов. В то же время систематических исследований влияния предварительной нагрузки на несущую способность железобетонных балок, усиленных углепластиком, ограниченное количество. В данной статье представлена методика оценки влияния уровня НДС усиления на несущую способность и другие параметры сечений изгибаемых железобетонных элементов, усиленных углепластиком, с учетом физической нелинейности бетона и используя реальные диаграммы деформирования, в том числе стальной арматуры и углепластика. На основе разработанной методики выполнены численные исследования работы железобетонных сечений, усиленных на различных этапах НДС. Проведя анализ полученных данных, можно сделать вывод о существенном влиянии уровня нагрузки усиления на деформативность, жесткость и прочность нормальных сечений железобетонных балок и необходимости учета данного фактора при расчете изгибаемых железобетонных элементов.</p></abstract><trans-abstract xml:lang="en"><p>Most of the experimental investigations devoted to the study of the stress-strain state of bent reinforced concrete elements reinforced with carbon fiber-based polymer-composite materials have examined only unloaded beams or beams without preliminary cracks. However, reinforcement of real load-bearing structures is most often performed under load and taking into account previously occurring defects. At the same time, there are a limited number of systematic studies of the effect of preload on the bearing capacity of reinforced concrete beams reinforced with carbon fiber. This article presents a methodology for assessing the effect of the stress-strain state level of reinforcement on the bearing capacity and other parameters of the sections of bent reinforced concrete elements reinforced with carbon fiber, taking into account the physical nonlinearity of concrete and using real deformation diagrams, including reinforcement and reinforcement systems. On the basis of the developed method, numerical studies of the operation of reinforced concrete sections reinforced at various stages of SSS were performed. After analyzing the obtained data, we can conclude that the level of reinforcement load has a significant effect on the deformability, rigidity and strength of normal sections of reinforced concrete beams and the need to take this factor into account when calculating bending reinforced concrete elements. After analyzing the data obtained, we can conclude that the influence of the reinforcement load level on the deformability, rigidity and strength of normal sections of reinforced concrete beams and the need to take this factor into account when calculating bending reinforced concrete elements.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>железобетонная балка</kwd><kwd>нагрузка усиления</kwd><kwd>внешнее армирование</kwd><kwd>углепластик</kwd><kwd>напряженнодеформированное состояние</kwd></kwd-group><kwd-group xml:lang="en"><kwd>RC beams</kwd><kwd>reinforcement load</kwd><kwd>external reinforcement</kwd><kwd>СFRP</kwd><kwd>stress-strain state</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Овчинников И.И., Овчинников И.Г., Чесноков Г.В., Михалдыкин Е.С. Анализ экспериментальных исследований по усилению железобетонных конструкций полимерными композитными материалами. 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