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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">10.33979/2073-7416-2023-109-5-45-53</article-id><article-id custom-type="elpub" pub-id-type="custom">construction-656</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>БЕЗОПАСНОСТЬ ЗДАНИЙ И СООРУЖЕНИЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BUILDING AND STRUCTURE SAFETY</subject></subj-group></article-categories><title-group><article-title>Функция надежности предварительно напряженной корродированной железобетонной балки при нелинейном распространении коррозии</article-title><trans-title-group xml:lang="en"><trans-title>Reliability function of a prestressed corroded reinforced concrete beam with nonlinear corrosion propagation</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>Мацеевич</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Matseevich</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мацеевич Татьяна Анатольевна, доктор физико-математических наук, доцент, профессор кафедры высшей математики</p><p>г. Москва</p></bio><bio xml:lang="en"><p>Matseevich Tatyana A., doctor of physical and mathematical sciences, associate professor, professor of the department of Higher Mathematics</p><p>Moscow</p></bio><email xlink:type="simple">MatseevichTA@mgsu.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>Андреев</surname><given-names>И. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Andreev</surname><given-names>I. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Андреев Илья Федорович, аспирант кафедры железобетонных и каменных конструкций</p><p>г. Москва</p></bio><bio xml:lang="en"><p>Andreev Ilya F., postgraduate student of the department of Reinforced Concrete and Stone Structures</p><p>Moscow</p></bio><email xlink:type="simple">yfyf@gmx.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет» (НИУ МГСУ)</institution></aff><aff xml:lang="en"><institution>National Research Moscow State University of Civil Engineering (NRU MGSU)</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>08</day><month>11</month><year>2023</year></pub-date><volume>0</volume><issue>5</issue><fpage>45</fpage><lpage>53</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мацеевич Т.А., Андреев И.Ф., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Мацеевич Т.А., Андреев И.Ф.</copyright-holder><copyright-holder xml:lang="en">Matseevich T.A., Andreev I.F.</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/656">https://construction.elpub.ru/jour/article/view/656</self-uri><abstract><p>В статье рассматривается функция предельного состояния в контексте анализа надежности корродированных балок. Обсуждаются методы определения предельной нагрузки для балок, подверженных коррозии. Рассматриваются различные подходы к определению функции предельного состояния, в том числе базирующиеся на статистических данных о коррозии и моделировании напряжений в железобетонной балке. Общая модель оценки надежности железобетонных конструкций должна включать распространение коррозии. Большинство предыдущих исследований были сосредоточены на проблемах одномерной диффузии с предполагаемой постоянной скоростью коррозии. Нелинейная модель скорости коррозии, в отличие от линейных моделей, рассматривает плотность тока коррозии не постоянной в течение срока службы железобетонной конструкции. Разработан подход к анализу надежности вместе с нелинейной моделью роста коррозии. В данной статье рассмотрены основные проблемы, связанные с надежностью при нелинейной модели коррозии преднапряженного арматурного каната железобетонных балок. Представлена функция уменьшения диаметра стержня арматуры от времени. Проведен анализ чувствительности для определения влияния параметров роста коррозии на индекс надежности железобетонной тавровой балки. Нелинейная модель роста коррозии вместе с другими соответствующими вероятностными моделями, используемыми для описания случайных переменных, была применена для анализа надежности железобетонной подкрановой балки. Выражение плотности тока коррозии показывает, что скорость коррозии увеличивается экспоненциально при увеличении значения расчетного параметра модели. Для дальнейшей оценки влияния предложенной модели роста коррозии по времени на надежность железобетонной балки рассматриваются два конкретных случая. Первый - с фиксированной плотностью тока коррозии, второй - с фиксированным ростом коррозии в заданное время.</p></abstract><trans-abstract xml:lang="en"><p>The paper considers the limit state function in the context of reliability analysis of corroded beams. Methods for determining the ultimate load limit for corroded beams are discussed. Various approaches to the determination of the limit state function are considered, including those based on statistical data on corrosion and modelling of stresses in a reinforced concrete beam. A general reliability assessment model for reinforced concrete structures should include corrosion propagation. Most previous studies have focused on one-dimensional diffusion problems with an assumed constant corrosion rate. A nonlinear corrosion rate model, unlike linear models, considers the corrosion current density not constant over the service life of a reinforced concrete structure. An approach to reliability analysis together with a nonlinear corrosion growth model is developed. In this paper, the main problems related to reliability under a nonlinear model of prestressed reinforcement rope corrosion of reinforced concrete beams are discussed. A function for the reduction of reinforcing bar diameter from time is presented. Sensitivity analysis is performed to determine the effect of corrosion growth parameters on the reliability index of reinforced concrete T-beam. The nonlinear corrosion growth model, together with other relevant probabilistic models used to describe random variables, was applied to analyze the reliability of a reinforced concrete crane girder. The expression of corrosion current density shows that the corrosion rate increases exponentially as the value of the design parameter of the model increases. To further evaluate the effect of the proposed time corrosion growth model on the reliability of reinforced concrete beam, two specific cases are considered. The first one is with fixed corrosion current density, and the second one is with fixed corrosion growth at a given time.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>функция надежности</kwd><kwd>плотность тока</kwd><kwd>нелинейное распространение коррозии</kwd><kwd>надежность</kwd><kwd>предельное состояние</kwd></kwd-group><kwd-group xml:lang="en"><kwd>reliability function</kwd><kwd>current density</kwd><kwd>non-linear corrosion propagation</kwd><kwd>reliability</kwd><kwd>limit 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">Меркулов С.И. Развитие теории конструктивной безопасности объектов в условиях коррозионных воздействий // Вестник БГТУ им. В.Г. Шухова. 2014. № 3. С. 44-46.</mixed-citation><mixed-citation xml:lang="en">Merkulov S.I. 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