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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">mgssuvest</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник МГСУ</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik MGSU</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-0935</issn><issn pub-type="epub">2304-6600</issn><publisher><publisher-name>Moscow State University of Civil Engineering (National Research University) (MGSU)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22227/1997-0935.2026.6.885-897</article-id><article-id custom-type="elpub" pub-id-type="custom">mgssuvest-1060</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>Проектирование и конструирование строительных систем. Строительная механика. Основания и фундаменты, подземные сооружения</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Construction system design and layout planning. Construction mechanics. Bases and foundations, underground structures</subject></subj-group></article-categories><title-group><article-title>Расчетная длина центрально-сжатой двутавровой колонны с линейно изменяющейся высотой стенки</article-title><trans-title-group xml:lang="en"><trans-title>Effective length of web-tapered pinned I-section column</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, ведущий инженер архитектурно-строительного отдела</p><p>680000, г. Хабаровск, Уссурийский бульвар, д. 2</p></bio><bio xml:lang="en"><p>Alexander O. Ilyushenkov — industrial and civil construction engineer, leading engineer of the Architectural and Construction Department</p><p>2 Ussuriysky boulevard, Khabarovsk, 680000</p></bio><email xlink:type="simple">revivaltree@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Территориальный проектный институт «Хабаровскпромпроект» (ТПИ «Хабаровскпромпроект»)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Territorial Design Institute “Khabarovskpromproekt”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>30</day><month>06</month><year>2026</year></pub-date><volume>21</volume><issue>6</issue><fpage>885</fpage><lpage>897</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ильюшенков А.О., 2026</copyright-statement><copyright-year>2026</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://www.vestnikmgsu.ru/jour/article/view/1060">https://www.vestnikmgsu.ru/jour/article/view/1060</self-uri><abstract><sec><title>Введение</title><p>Введение. Представлен комплексный аналитический анализ потери устойчивости двутавровых колонн c линейно изменяющейся высотой стенки по длине. Решения получены в замкнутом виде с помощью аналитического метода Бубнова – Галеркина и прямого интегрирования дифференциального уравнения изогнутой оси стержня. Проверяется эффективность метода Бубнова – Галеркина для решения задачи о нахождении коэффициента расчетной длины шарнирно-опертой центрально-сжатой колонны переменной жесткости. Также предлагаются альтернативный взгляд на проблему потери устойчивости колонны переменной жесткости и дополнение решения путем пересмотра базисной функции, основанной на параметре ψ1. Такой подход решения образует независимый взгляд на анализ задачи потери устойчивости двутавровых колонн с конической стенкой. Полученные значения коэффициента расчетной длины оказываются близкими друг к другу, а средняя относительная погрешность не превышает 5 %.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Использованы аналитический метод Бубнова – Галеркина и прямое интегрирование дифференциального уравнения.</p></sec><sec><title>Результаты</title><p>Результаты. На основе аналитических методов получены уравнения коэффициента расчетной длины двутавровой колонны переменной жесткости в замкнутой форме. Всего представлены три формулы для расчета. </p></sec><sec><title>Выводы</title><p>Выводы. Предлагаемые формулы коэффициента расчетной длины позволяют выполнить расчет шарнирно-опертой двутавровой колонны с линейно изменяющейся высотой стенки по длине на устойчивость. Результаты исследования также содержат дополнительную информацию о внецентренно-нагруженных двутавровых элементах с конической стенкой.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. This paper presents a comprehensive analytical study of the buckling of I-section columns with web depth varying linearly along the column length. Closed-form solutions were obtained using the analytical Bubnov – Galerkin method and direct integration of the differential equation of the deflected axis for the member. The effectiveness of the Bubnov – Galerkin method is assessed for determining the effective length factor of a pinned centrally compressed column with variable stiffness. An alternative view of the buckling problem for a variable-stiffness column is also proposed, and the solution is supplemented by reconsidering the basis function based on parameter ψ1. This approach provides an independent analysis of the buckling problem of I-section columns with a tapered web. The obtained values of the effective length factor are close to each other, and the mean relative error does not exceed 5 %.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The analytical Bubnov – Galerkin method and direct integration of the differential equation were used.</p></sec><sec><title>Results</title><p>Results. Using analytical methods, closed-form equations for the effective length factor of an I-section column with variable stiffness were obtained. In total, three calculation formulas are presented.</p></sec><sec><title>Conclusions</title><p>Conclusions. The proposed formulas for the effective length factor make it possible to perform a stability calculation of a pinned I-section column with linearly varying web depth along its length. The study also provides additional information on eccentrically loaded I-section members with a tapered web.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>упругая потеря устойчивости</kwd><kwd>элемент переменной жесткости</kwd><kwd>двутавровая колонна</kwd><kwd>параметр высоты</kwd><kwd>базисная функция</kwd><kwd>метод Бубнова – Галеркина</kwd><kwd>коэффициент расчетной длины</kwd></kwd-group><kwd-group xml:lang="en"><kwd>elastic buckling</kwd><kwd>variable-stiffness member</kwd><kwd>I-section column</kwd><kwd>depth parameter</kwd><kwd>basis function</kwd><kwd>Bubnov – Galerkin method</kwd><kwd>effective length factor</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">Динник А.Н. 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