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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">mirtr</journal-id><journal-title-group><journal-title xml:lang="ru">Мир транспорта</journal-title><trans-title-group xml:lang="en"><trans-title>World of Transport and Transportation</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1992-3252</issn><publisher><publisher-name>Russian University of Transport (RUT)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.30932/1992-3252-2024-22-4-5</article-id><article-id custom-type="elpub" pub-id-type="custom">mirtr-2761</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>НАУКА И ТЕХНИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SCIENCE AND ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Метод определения долговечности пролётного строения моста</article-title><trans-title-group xml:lang="en"><trans-title>Method for Determining Durability of a Bridge Superstructure</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5183-7420</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Огурцов</surname><given-names>Г. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Ogurtsov</surname><given-names>G. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Огурцов Глеб Леонидович – ассистент.</p><p>Санкт-Петербург</p><p>Web of Science Researcher ID AFI-6310-2022; Scopus Author ID 57939891300; РИНЦ Author ID 957338</p></bio><bio xml:lang="en"><p>Gleb L. Ogurtsov - Assistant Lecturer at the Higher School of Industrial, Civil and Road Construction, Peter the Great St. Petersburg Polytechnic University.</p><p>St. Petersburg</p><p>Researcher ID AFI-6310–2022; Scopus Author ID 57939891300; Russian Science Citation Index Author ID 957338</p></bio><email xlink:type="simple">ogurtsov_gl@spbstu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0367-5375</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ермошин</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ermoshin</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ермошин Николай Алексеевич – доктор военных наук, профессор.</p><p>Санкт-Петербург</p><p>Web of Science Researcher ID ABA-1133-2020; Scopus Author ID 57215847497; РИНЦ Author ID 735873</p></bio><bio xml:lang="en"><p>Nikolay A. Ermoshin - D.Sc. (Mil. Sc.), Professor at the Higher School of Industrial, Civil and Road Construction, Peter the Great St. Petersburg Polytechnic University.</p><p>St. Petersburg</p><p>Web of Science Researcher ID ABA-1133–2020; Scopus Author ID 57215847497; Russian Science Citation Index Author ID 735873</p></bio><email xlink:type="simple">ermoshin_na@spbstu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Высшая школа промышленно-гражданского и дорожного строительства, Санкт-Петербургского политехнического университета Петра Великого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Higher School of Industrial, Civil and Road Construction, Peter the Great St. Petersburg Polytechnic University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>21</day><month>12</month><year>2025</year></pub-date><volume>22</volume><issue>4</issue><fpage>33</fpage><lpage>42</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Огурцов Г.Л., Ермошин Н.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Огурцов Г.Л., Ермошин Н.А.</copyright-holder><copyright-holder xml:lang="en">Ogurtsov G.I., Ermoshin N.A.</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://mirtr.elpub.ru/jour/article/view/2761">https://mirtr.elpub.ru/jour/article/view/2761</self-uri><abstract><p>Целью исследования является разработка метода определения долговечности железобетонной балки пролётного строения при воздействии агрессивных сред.</p><p>Научное обоснование метода выполнено на основе законов установления среди гомогенных частей железобетона равномерного распределения концентраций атмосферных газов и определения глубины их диффузии. Для описания скорости проникновения применены аналитические уравнения определения глубины диффузии атмосферных газов в бетон. При достижении продуктами диффузии рабочей арматуры начинаются процессы коррозии, что вызывает снижение эффективной площади, и, как следствие, потерю несущей способности балки пролётного строения во время эксплуатации мостового сооружения.</p><p>На основании предложенного метода расчёта сформирована регрессионная модель оценки долговечности железобетонных конструкций в зависимости от диффузии агрессивных сред и разного количества дней в году с осадками. Анализ полученных результатов показал, что при достижении продуктов диффузии атмосферных газов рабочей арматуры начинаются процессы необратимых изменений (необратимого снижения) несущей способности пролётного строения. Установлено, что срок службы до отказа при воздействии галогенов и галогенводородных кислот может составить не более 30 лет. Применение метода позволяет определять остаточный срок службы пролётного строения на основании оценки ресурса несущей способности и разрабатывать нормативные документы по срокам выполнения ремонтных работ.</p></abstract><trans-abstract xml:lang="en"><p>The objective of the study is to develop a method for determining the durability of a reinforced concrete girder of a superstructure when exposed to aggressive environments.</p><p>The scientific substantiation of the method is based on the laws of establishing a uniform distribution of atmospheric gas concentrations among homogeneous parts of reinforced concrete and determining the depth of their diffusion. To describe the penetration rate, analytical equations are applied to determine the depth of diffusion of atmospheric gases into concrete. When the diffusion products reach the main reinforcement, corrosion processes start, which cause a decrease in the effective area, and, therefore, a loss of the bearing capacity of the girder of the superstructure during operation of the bridgework.</p><p>The proposed calculation method has allowed to build a regression model for assessing durability of reinforced concrete structures depending on the diffusion of aggressive environments and on a variable number of days per year with precipitation. Analysis of the obtained results has shown that when the diffusion products of atmospheric gases reach the main reinforcement, processes of irreversible changes (irreversible decrease) in the bearing capacity of the superstructure begin. It has been established that the service life before failure when exposed to halogens and hydrohalic acids may not exceed 30 years. The application of the method makes it possible to determine the residual service life of the superstructure based on assessment of the bearing capacity resource and to develop regulatory documents on timing of repair work.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>транспортное строительство</kwd><kwd>долговечность</kwd><kwd>срок службы</kwd><kwd>несущая способность</kwd><kwd>пролётное строение</kwd><kwd>мостовое сооружение</kwd><kwd>коррозия арматуры</kwd><kwd>агрессивные среды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>transport construction</kwd><kwd>durability</kwd><kwd>service life</kwd><kwd>bearing capacity</kwd><kwd>superstructure</kwd><kwd>bridgework</kwd><kwd>reinforcement corrosion</kwd><kwd>aggressive environment</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">Гулицкая Л. В., Шиманская О. С. 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