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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">firesmi</journal-id><journal-title-group><journal-title xml:lang="ru">Пожаровзрывобезопасность/Fire and Explosion Safety</journal-title><trans-title-group xml:lang="en"><trans-title>Pozharovzryvobezopasnost/Fire and Explosion Safety</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0869-7493</issn><issn pub-type="epub">2587-6201</issn><publisher><publisher-name>ФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18322/PVB.2019.28.06.29-34</article-id><article-id custom-type="elpub" pub-id-type="custom">firesmi-805</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, СООРУЖЕНИЙ, ОБЪЕКТОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SAFETY OF BUILDINGS, STRUCTURES, OBJECTS</subject></subj-group></article-categories><title-group><article-title>Расчет фактического предела огнестойкости незащищенных стальных конструкций при различных температурных режимах пожара</article-title><trans-title-group xml:lang="en"><trans-title>An evaluation of an actual fire resistance limit of non-protected steel structures for different temperature regimes of fires</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1916-2547</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шебеко</surname><given-names>Ю. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Shebeko</surname><given-names>Yu. N.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">yn_shebeko@mail.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/0000-0002-7799-2058</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зубань</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zuban</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">avzuban@mail.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/0000-0002-5771-2127</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шебеко</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Shebeko</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">ay_shebeko@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт противопожарной обороны МЧС России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>All-Russian Research Institute for Fire Protection of Emercom of Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>18</day><month>01</month><year>2020</year></pub-date><volume>28</volume><issue>6</issue><fpage>29</fpage><lpage>34</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шебеко Ю.Н., Зубань А.В., Шебеко А.Ю., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Шебеко Ю.Н., Зубань А.В., Шебеко А.Ю.</copyright-holder><copyright-holder xml:lang="en">Shebeko Y.N., Zuban A.V., Shebeko A.Y.</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.fire-smi.ru/jour/article/view/805">https://www.fire-smi.ru/jour/article/view/805</self-uri><abstract><sec><title>Введение</title><p>Введение. В соответствии с требованиями СП 2.13130.2012 (п. 5.4.3) допускается применение незащищенных стальных конструкций, если требуемый предел их огнестойкости составляет R15 (RE15, REI15). Однако фактический предел огнестойкости зависит как от приведенной толщины конструкции, так и от температурного режима пожара (“целлюлозный” или углеводородный). Работа посвящена расчетной оценке фактического предела огнестойкости незащищенных стальных конструкций для температурных режимов, соответствующих стандартным “целлюлозному” и углеводородному пожарам, в зависимости от приведенной толщины конструкций.</p><p>Методика расчета и полученные результаты. Численное моделирование прогрева конструкций проводили с помощью программного комплекса FDS 6. Рассматривались стальные незащищенные конструкции с приведенной толщиной δкр от 3 до 60 мм. Предел огнестойкости устанавливали по достижении конструкцией температуры 500 °С. Получены зависимости фактического предела огнестойкости конструкции от ее приведенной толщины δкр, который для углеводородного режима пожара оказался существенно ниже, чем для “целлюлозного”. Найдена зависимость отношения пределов огнестойкости для углеводородного и “целлюлозного” пожаров от приведенной толщины строительной конструкции.</p></sec><sec><title>Заключение</title><p>Заключение. Результаты работы подтверждают обоснованность требований СП 2.13130.2012 (п. 5.4.3) в части возможности применения незащищенных стальных конструкций, если требуемый предел огнестойкости составляет R15 (RE15, REI15) для “целлюлозного” пожара. В то же время для углеводородного режима пожара данное требование неприменимо.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. A normative document Set of Rules 2.13130.2012 (item 5.4.3) states that if an required fire resistance limit of structures is equal to R15 (RE15, REI15) an application of non-protected steel structures is possible. But an actual fire resistance limit depends both on a reduced thickness of the structure and a temperature regime of a fire (for example “cellulose” or hydrocarbon regime). This study is aimed on a numerical evaluation of the actual fire resistance limit of the non-protected steel structures for the standard “cellulose” and hydrocarbon temperature regimes of fires at various reduced thickness of the structures.</p></sec><sec><title>Methodology and results</title><p>Methodology and results. A numerical modeling of a heating of the structures was carried out using the software FDS 6. The non-protected steel structures having the reduced thickness δcr from 3 to 60 mm were considered. The fire resistance limits were determined as a time interval from a beginning of the fire to the time moment when the temperature of the structure reaches a value of 500 °C. Dependences of the actual fire resistance limits on δcr were obtained. These limits for the hydrocarbon fire were substantially lower than for “cellulose” one. A dependence of a ratio of the fire resistance limits for the hydrocarbon and “cellulose” fires on the reduced thickness of the structure was found.</p></sec><sec><title>Conclusion</title><p>Conclusion. The results of this study confirm the requirement of the normative document Set of Rules 2.13130.2012 (item 5.4.3) concerning a possibility of the application of the non-protected steel structures in the case when the required fire resistance limit is equal to R15 (RE15, REI15), but only for the “cellulose” fire. But this requirement is not valid for the hydrocarbon fire.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>“целлюлозный” пожар</kwd><kwd>углеводородный пожар</kwd><kwd>приведенная толщина конструкции</kwd><kwd>FDS 6</kwd><kwd>прогрев конструкции</kwd></kwd-group><kwd-group xml:lang="en"><kwd>“cellulose” fire</kwd><kwd>hydrocarbon fire</kwd><kwd>reduced thickness of a structure</kwd><kwd>software FDS 6</kwd><kwd>temperatures of steel structures</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">Молчадский И. С. Пожар в помещении. — М. : ВНИИПО, 2005. — 456 с.</mixed-citation><mixed-citation xml:lang="en">I. S. Molchadskiy. Pozhar v pomeshchenii [Fire in a room]. Moscow, VNIIPO Publ., 2005. 456 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Голованов В. И., Павлов В. 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