<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">vestnikcstroy</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник НИЦ «Строительство»</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Science and Research Center of Construction</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2224-9494</issn><issn pub-type="epub">2782-3938</issn><publisher><publisher-name>АО «НИЦ «Строительство»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.37538/2224-9494-2025-3(46)-22-42</article-id><article-id custom-type="edn" pub-id-type="custom">FKKCEI</article-id><article-id custom-type="elpub" pub-id-type="custom">vestnikcstroy-551</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>СТРОИТЕЛЬНЫЕ КОНСТРУКЦИИ, ЗДАНИЯ И СООРУЖЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BUILDING CONSTRUCTIONS, BUILDINGS AND STRUCTURES</subject></subj-group></article-categories><title-group><article-title>Развитие инженерной методики расчета устойчивости плоской формы изгиба двутавровой балки</article-title><trans-title-group xml:lang="en"><trans-title>Development of engineering methodology for calculating the plane bending stability of an I-beam</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>Ильюшенков</surname><given-names>А. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Ilyushenkov</surname><given-names>A. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Александр Олегович Ильюшенков, инженер промышленного и гражданского строительства, АО «Территориальный проектный институт «Хабаровскпромпроект», Хабаровск</p><p>ул. Уссурийский бульвар, д. 2, г. Хабаровск, 680000, Российская Федерация</p><p>e-mail: revivaltree@gmail.com</p></bio><bio xml:lang="en"><p>Alexander O. Ilyushenkov, Civil and Industrial Engineer, Territorial Design Institute Khabarovskpromproekt JSC, Khabarovsk</p><p>Ussuriysky Blvd., 2, Khabarovsk, 680000, Russian Federation</p><p>e-mail: revivaltree@gmail.com</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>АО «Территориальный проектный институт «Хабаровскпромпроект»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Territorial Design Institute Khabarovskpromproekt JSC</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>22</day><month>09</month><year>2025</year></pub-date><volume>46</volume><issue>3</issue><fpage>22</fpage><lpage>42</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ильюшенков А.О., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ильюшенков А.О.</copyright-holder><copyright-holder xml:lang="en">Ilyushenkov A.O.</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://vestnik.cstroy.ru/jour/article/view/551">https://vestnik.cstroy.ru/jour/article/view/551</self-uri><abstract><sec><title>Введение</title><p>Введение. Нет сомнений в том, что методика расчета устойчивости плоской формы изгиба балки является одним из самых слабых мест в текущем своде правил по стальным конструкциям. Из-за ограничений метода результаты расчета часто не согласуются с численными расчетами и исследованиями. Нормативный метод расчета основан на трехфакторной формуле и позволяет рассчитывать только простые случаи. В то время как применение стальных зданий для различных нужд растет, нормы проектирования отстают от сегодняшних потребностей и часто оказываются неспособными следовать за расчетами и давать достаточные ответы на вопросы. Как кажется, причина кроется в том, что в области теории устойчивости нет современных разработок. Мы никак не пересматриваем наши предыдущие результаты и даже не пытаемся улучшить текущую теорию. А в случае с теорией балок похоже, что мы завели ее в тупик.</p></sec><sec><title>Цель</title><p>Цель. Создание современного подхода в разрешении вопроса изгибно-крутильной потери устойчивости балки. Создание единого уравнения коэффициента устойчивости при изгибе.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Переработка бифуркационной задачи по теории В.З. Власова для тонкостенных стержней и разработка формулы в деформационной теории на основании формулы Мерчанта, показательной и степенной функций.</p></sec><sec><title>Результаты</title><p>Результаты. По результатам работы предлагается усовершенствованная методика расчета устойчивости плоской формы изгиба балки, а также новый набор коэффициентов и уравнений для решения задачи. Предложенные решения дополняют и расширяют СП 16.13330.2017.</p></sec><sec><title>Выводы</title><p>Выводы. Показывается возможность расширения методов и норм расчета стальных конструкций в части общей устойчивости балок.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. In the ongoing code of practice for steel structures, the methodology for calculating the plane bending stability of beams is undoubtedly regarded as its’ weak point. Due to the limitations of the method, the calculation results often do not agree with numerical calculations and studies. The normative calculation method uses a three-factor formula, thus providing for the calculation of simple cases only. While the use of steel structures for various needs is increasing, design codes remain behind the present demands thereby often failing to follow the calculations and provide sufficient answers to questions. Apparently, the reason lies in the fact that there are no modern developments in the field of stability theory. No previous results are revised and no attempt is made to improve the current theory. Moreover, in the case of beam theory, a dead end seems to have been reached.</p></sec><sec><title>Aim</title><p>Aim. To develop a more advanced approach in resolving the bending-torsional loss of beam stability, as well as to make a unified equation of bending stability coefficient.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The bifurcation problem in V.Z. Vlasov theory for thin-walled rods was revised, and a formula in deformation theory was developed based on Merchant’s formula, exponential and degree functions.</p></sec><sec><title>Results</title><p>Results. An improved methodology for calculating the stability of the plane bending form of a beam, as well as a new set of coefficients and equations for solving the problem are proposed. These solutions complement and extend SP 16.13330.2017.</p></sec><sec><title>Conclusions</title><p>Conclusions. The methods and standards for the calculation of steel structures in terms of the overall stability of beams can be extended to comply with contemporary requirements.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>устойчивость</kwd><kwd>изгибно-крутильная устойчивость</kwd><kwd>дифференциальное уравнение</kwd><kwd>двутавровая балка</kwd><kwd>формула Мерчанта</kwd><kwd>бифуркационная теория</kwd><kwd>деформационная теория</kwd><kwd>показательная функция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>stability</kwd><kwd>bending-torsional stability</kwd><kwd>differential equation</kwd><kwd>I-beam</kwd><kwd>Merchant’s formula</kwd><kwd>bifurcation theory</kwd><kwd>deformation theory</kwd><kwd>exponential function</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">&lt;i&gt;Власов В.З.&lt;/i&gt; Тонкостенные упругие стержни. Москва: Физматгиз; 1959.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Vlasov V.Z.&lt;/i&gt; Thin-Walled Elastic Rods. Moscow: Fizmatgiz Publ.; 1959. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Броуде Б.М.&lt;/i&gt; Предельные состояния стальных балок. Москва: Стройиздат; 1953.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Broude B.M.&lt;/i&gt; Limit States of Steel Beams. Moscow: Stroiizdat Publ.; 1953. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Ильин В.П.&lt;/i&gt; Численные методы решения задач строительной механики. Минск: Вышэйшая школа; 1990.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Ilyin V.P.&lt;/i&gt; Numerical methods for solving problems of structural mechanics. Minsk.: Vischeischiya schkola Publ.; 1990. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">СП 16.13330.2017. Стальные конструкции. Актуализированная редакция СНиП II-23-81*. Москва: Минстрой России; 2017.</mixed-citation><mixed-citation xml:lang="en">SP 16.13330.2017. Steel structures. Updated version of SNiP II-23-81*. Moscow: Ministry of Construction, Housing and Utilities of the Russian Federation; 2017. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">СП 294.1325800.2017. Конструкции стальные. Правила проектирования. Москва: Минстрой России; 2017.</mixed-citation><mixed-citation xml:lang="en">SP 294.1325800.2017. The construction of steel. Design rules. Moscow: Ministry of Construction, Housing and Utilities of the Russian Federation; 2017. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Градштейн И.С.&lt;/i&gt; Таблицы интегралов. Москва: Физмат; 1963.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Gradstein I.S.&lt;/i&gt; Table of integrals. Moscow: Fizmat Publ.; 1963. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Алексеев П.И.&lt;/i&gt; Устойчивость стержней и балок. Киев: Будивельник; 1964.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Alekseev P.I.&lt;/i&gt; Stability of rods and beams. Kiev: Budivelnik Publ.; 1964. (In Russian).</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Uzun E.T.&lt;/i&gt; Lateral torsional buckling of doubly symmetric I-shaped steel members under linear moment. Pamukkale University Journal of Engineering Sciences. 2019;25(6):635–642. https://doi.org/10.5505/pajes.2018.46656.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Uzun E.T.&lt;/i&gt; Lateral torsional buckling of doubly symmetric I-shaped steel members under linear moment. Pamukkale University Journal of Engineering Sciences. 2019;25(6):635–642. https://doi.org/10.5505/pajes.2018.46656.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Fukumoto Y.&lt;/i&gt; Lateral-torsional buckling strength of steel beams from test data. Proceedings of the Japan Society of Civil Engineers. 1984;1984(341):137–146. https://doi.org/10.2208/jscej1969.1984.137.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Fukumoto Y.&lt;/i&gt; Lateral-torsional buckling strength of steel beams from test data. Proceedings of the Japan Society of Civil Engineers. 1984;1984(341):137–146. https://doi.org/10.2208/jscej1969.1984.137.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Itoh Y.&lt;/i&gt; Experimental and numerical analysis database on structural stability. Engineering Structures. 1996;18(10):812–820. https://doi.org/10.1016/0141-0296(96)00010-7.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Itoh Y.&lt;/i&gt; Experimental and numerical analysis database on structural stability. Engineering Structures. 1996;18(10):812–820. https://doi.org/10.1016/0141-0296(96)00010-7.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Kubo M.&lt;/i&gt; Effects of moment distribution on lateral-torsional buckling strength of rolled steel I-beams. Doboku Gakkai Ronbunshu.1986;1986(368):255–263. https://doi.org/10.2208/jscej.1986.368_255.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Kubo M.&lt;/i&gt; Effects of moment distribution on lateral-torsional buckling strength of rolled steel I-beams. Doboku Gakkai Ronbunshu.1986;1986(368):255–263. https://doi.org/10.2208/jscej.1986.368_255.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Kubo M., Fukumoto Y.&lt;/i&gt; Lateral-torsional buckling of thin-walled I-beams. Journal of Structural Engineering. 1988;114(4):841–855. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:4(841).</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Kubo M., Fukumoto Y.&lt;/i&gt; Lateral-torsional buckling of thin-walled I-beams. Journal of Structural Engineering. 1988;114(4):841–855. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:4(841).</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Tide R.H.R.&lt;/i&gt; Reasonable Column Design Equations. In: Conference Proceedings, Annual Technical Session of Structural Stability Research Council, April 16–17, Cleveland, Ohio, Lehigh University, Bethlehem, PA, 1985. Available at: https://www.aisc.org/globalassets/aisc/manual/15th-ed-ref-list/reasonable-column-design-equations.pdf.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Tide R.H.R.&lt;/i&gt; Reasonable Column Design Equations. In: Conference Proceedings, Annual Technical Session of Structural Stability Research Council, April 16–17, Cleveland, Ohio, Lehigh University, Bethlehem, PA, 1985. Available at: https://www.aisc.org/globalassets/aisc/manual/15th-ed-ref-list/reasonable-columndesign-equations.pdf.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">&lt;i&gt;Bjorhovde R., Tall L.&lt;/i&gt; Development of Multiple Column Curves. IABSE reports of the working commissions. 1975;23:378–384.</mixed-citation><mixed-citation xml:lang="en">&lt;i&gt;Bjorhovde R., Tall L.&lt;/i&gt; Development of Multiple Column Curves. IABSE reports of the working commissions. 1975;23:378–384.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">ANSI/AISC 360-22. Specification for Structural Steel Buildings [internet]. American Institute of Steel Construction; 2022. Available at: https://www.aisc.org/globalassets/product-files-not-searched/publications/standards/a360-22w.pdf.</mixed-citation><mixed-citation xml:lang="en">ANSI/AISC 360-22. Specification for Structural Steel Buildings [internet]. American Institute of Steel Construction; 2022. Available at: https://www.aisc.org/globalassets/product-files-not-searched/publications/standards/a360-22w.pdf.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
