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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">10.22227/2949-1622.2024.1.3-14</article-id><article-id custom-type="elpub" pub-id-type="custom">concconc-39</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>Исследование влияния местной низкой прочности бетона на несущую способность изгибаемых железобетонных балок</article-title><trans-title-group xml:lang="en"><trans-title>Investigation of the Influence of Local Low Strength Concrete on the Bearing Capacity of Bending Reinforced Concrete Beams</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0569-4788</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тамразян</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Tamrazyan</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ашот Георгиевич Тамразян, чл.-корр. РААСН, д-р техн. наук, профессор, заведующий кафедрой железобетонных и каменных конструкций</p><p>129337, г. Москва, Ярославское шоссе, д. 26</p><p>Scopus: 55975413900, ResearcherID: T-1253-2017</p></bio><bio xml:lang="en"><p>Ashot G. Tamrazyan, Corresponding member of RAACS, Doctor of Technical Sciences, Professor, Неad of the Department of Reinforced Concrete and Masonry Structures</p><p>26 Yaroslavskoe shosse, Moscow, 129337</p><p>Scopus: 55975413900, ResearcherID: T-1253-2017</p></bio><email xlink:type="simple">tamrazian@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Национальный исследовательский Московский государственный строительный университет (НИУ МГСУ)<country>Россия</country></aff><aff xml:lang="en">Moscow State University of Civil Engineering (National Research University) (MGSU)<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>08</day><month>02</month><year>2024</year></pub-date><volume>5</volume><issue>1</issue><fpage>3</fpage><lpage>14</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Тамразян А.Г., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Тамразян А.Г.</copyright-holder><copyright-holder xml:lang="en">Tamrazyan A.G.</copyright-holder><license 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/39">https://www.g-b-k.ru/jour/article/view/39</self-uri><abstract><p>В железобетонных балках может возникать местная низкая прочность бетона при определенных условиях, например, плохая практика строительства может вызвать такие проблемы как пустоты в бетоне, образование полостей на поверхности, образование трещин в блоках, появление поверхностных раковин и создать участки с низкой прочностью бетона. В этом исследовании представлена реакция изгибаемых шарнирно опертых железобетонных балок с различными местными участками низкой прочности бетона вдоль пролета. Для описания свойств бетона приняты модифицированные модели, а для свойств стали -идеальная упругопластическая модель. Балка разделена на три основные части: одна чувствительна к изгибающему моменту, вторая чувствительна к сдвигу, а третья чувствительна к сцеплению. Переменные включали два типа прочности бетона и один диаметр арматуры. Результаты исследования показывают, что наиболее критическая область с низкой прочностью бетона вдоль пролета балки представляет собой зону вблизи опор, что отражается на пластичности кривых нагрузка-прогиб. Разработана новая обобщенная эмпирическая модель для предсказания эффекта снижения несущей способности от местного низкопрочного бетона.</p></abstract><trans-abstract xml:lang="en"><p>Reinforced concrete beams can experience local low concrete strength under certain conditions, for example, poor construction practices can cause problems such as concrete voids, surface cavities, block cracking, surface sinks and create areas of low concrete strength. This study presents the response of flexural hinge-supported reinforced concrete beams with different local areas of low concrete strength along the span. </p><p>Modified models are adopted to describe the concrete properties and an ideal elastic-plastic model is adopted for the steel properties. The beam was divided into three main parts: one sensitive to bending moment, the second sensitive to shear, and the third sensitive to bond. The variables included two types of concrete strength and one reinforcement diameter. The results show that the most critical region with low concrete strength along the span of the beam is the confluence zone near the supports, which is reflected in the ductility of the load-deflection curves. A new generalized empirical model is developed to predict the effect of bearing capacity reduction from local low-strength concrete.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>железобетонная балка</kwd><kwd>низкопрочный бетон</kwd><kwd>нелинейный анализ</kwd><kwd>диаграмма нагрузка–прогиб</kwd><kwd>изгибающий момент</kwd><kwd>сдвиг</kwd><kwd>сцепление</kwd></kwd-group><kwd-group xml:lang="en"><kwd>reinforced concrete beam</kwd><kwd>low-strength concrete</kwd><kwd>nonlinear analysis</kwd><kwd>load-deflection diagram</kwd><kwd>bending moment</kwd><kwd>shear</kwd><kwd>bond</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">Scott B.D.,Park R., Priestley M.J.N. 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