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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">sibadi</journal-id><journal-title-group><journal-title xml:lang="ru">Научный рецензируемый журнал "Вестник СибАДИ"</journal-title><trans-title-group xml:lang="en"><trans-title>The Russian Automobile and Highway Industry Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2071-7296</issn><issn pub-type="epub">2658-5626</issn><publisher><publisher-name>The Siberian State Automobile and Highway University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26518/2071-7296-2025-22-5-844-857</article-id><article-id custom-type="edn" pub-id-type="custom">VCASDS</article-id><article-id custom-type="elpub" pub-id-type="custom">sibadi-2090</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>СТРОИТЕЛЬСТВО И АРХИТЕКТУРА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CONSTRUCTION AND ARCHITECTURE</subject></subj-group></article-categories><title-group><article-title>Учёт жёсткости опорных узлов в расчётах тонкостенных стержней симметричного сечения при поперечном изгибе с кручением</article-title><trans-title-group xml:lang="en"><trans-title>Bearing joint rigidity in designing thin-walled beams with two axes of symmetry when bending with torsion</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9892-150X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ступин</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Stupin</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ступин Михаил Александрович, ведущий ин­женер </p><p>298313, г. Керчь, ул. Танкистов, 4</p><p> </p></bio><bio xml:lang="en"><p>Stupin Mikhail A., Leading Engineer</p><p>4, Tankistov Str., Kerch, 298313</p></bio><email xlink:type="simple">misha.stupin2014@yandex.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/0000-0002-2915-982X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макеев</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Makeev</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Макеев Сергей Александрович, д-р техн. наук</p><p>644050, г. Омск, просп. Мира, 5</p><p>Author ID: 374540</p></bio><bio xml:lang="en"><p>Makeev Sergey A., Doctor of Technical Science, Associate Professor</p><p>5, Ave. Mira, Omsk, 644050</p></bio><email xlink:type="simple">makeev608079@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6919-3686</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Комлев</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Komlev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Комлев Андрей Александрович, канд. техн. наук, доц. </p><p>644050, г. Омск, просп. Мира, 5</p></bio><bio xml:lang="en"><p>Komlev Andrey A., PhD in Engineering, Associate Professor</p><p>5, Ave. Mira, Omsk, 644050</p></bio><email xlink:type="simple">komlev-12@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">АО «Судостроительный завод им. Б.Е. Бутомы»<country>Россия</country></aff><aff xml:lang="en">B.E.Butoma Shipbuilding Plant JSC<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Сибирский государственный автомобильно-дорожный университет (СибАДИ)<country>Россия</country></aff><aff xml:lang="en">The Siberian State Automobile and Highway University (SibADI)<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>11</day><month>11</month><year>2025</year></pub-date><volume>22</volume><issue>5</issue><fpage>844</fpage><lpage>857</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ступин М.А., Макеев С.А., Комлев А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ступин М.А., Макеев С.А., Комлев А.А.</copyright-holder><copyright-holder xml:lang="en">Stupin M.A., Makeev S.A., Komlev A.A.</copyright-holder><license 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.sibadi.org/jour/article/view/2090">https://vestnik.sibadi.org/jour/article/view/2090</self-uri><abstract><p>Статья посвящена вопросам механики тонкостенных стержней. В статье приводится решение уравнения В.З. Власова для изгиба с кручением тонкостенного стержня с двумя осями симметрии, учитывающее влияние жёсткости (податливости) опорных узлов.</p><sec><title>Введение</title><p>Введение. Описывается текущее состояние вопроса расчётов тонкостенных стержней при поперечном изгибе с кручением.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Приводится решение системы дифференциальных уравнений устойчивости плоской формы изгиба В.З. Власова для тонкостенных стержней при поперечном изгибе с кручением с учётом влияния жёсткости (податливости) опорных узлов. Исходные уравнения В.З. Власова для изгиба с кручением тонкостенного стержня с двумя осями симметрии преобразовываются в правую систему координат. Далее из двух дифференциальных уравнений В.З. Власова получается система из 12 уравнений для всех расчётных усилий и деформаций в тонкостенном стержне. Также получены граничные условия, учитывающие связь между усилиями и деформациями в опорном сечении. Далее в работе приведены результаты решения указанной системы уравнений методом Эйлера.</p></sec><sec><title>Результаты</title><p>Результаты. Получено решение системы уравнений В.З. Власова для устойчивости тонкостенных стержней при поперечном изгибе с учётом жёсткости (податливости) опорных узлов методом Эйлера и общий вид функции угла поворота поперечного сечения. Решение получено для стержней с любыми опорными узлами, от чистого шарнира до абсолютно жёстких узлов. В разделе приведены результаты численной верификации и сделаны выводы о точности полученного решения. При верификации рассмотрен частный случай балок различного сечения с абсолютно жёсткими опорными узлами. Разница между численным решением в ПК «ЛИРА-САПР» и решением, предлагаемым в статье, находится в пределах 12%.</p></sec><sec><title>Обсуждение и заключение</title><p>Обсуждение и заключение. Сделаны выводы о точности разработанной математической модели. Разница вызвана точностью определения моментов инерции сечения на чистое кручение и жёсткости опорных узлов.</p></sec></abstract><trans-abstract xml:lang="en"><p>The article is devoted to the mechanics of thin-walled beams. A solution to the Vlasov equation for bending with torsion of a thin-walled beam with two axes of symmetry is provided, the effect of bearing joint rigidity being taken into account.</p><sec><title>Introduction</title><p>Introduction. The current state of the issue of designing thin-walled beams subjected to transverse bending with torsion is described.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The solution of the system of differential equations of stability of the plane bending form of V.Z. Vlasov for thin-walled beams under transverse bending with torsion is presented, the effect of bearing joint rigidity being taken into account. The original equations of V.Z. Vlasov for bending and torsion of a thin-walled beam with two axes of symmetry are transformed into a right-hand coordinate system. Next, from two differential equations of V.Z. Vlasov, a system of 12 equations is obtained for all calculated forces and deformations in a thin­walled beam. Boundary conditions were also obtained that take into account the relationship between forces and deformations in the support section. The results of solving the specified system of equations using the Euler method are presented.</p></sec><sec><title>Results</title><p>Results. The solution of Vlasov system of equations for the stability of thin-walled beams under transverse bending is obtained, taking into account the rigidity (malleability) of the support nodes by the Euler method and the general form of the function of the angle of rotation of the cross section. The solution is obtained for beams with any support nodes, from a pure hinge to absolutely rigid nodes. The paper presents the results of numerical verification and draws conclusions on the accuracy of the obtained solution. During verification, a special case of beams of various cross-sections with absolutely rigid support units was considered. The difference between the numerical solution in the LIRA-CAD PC and the solution proposed in the article is within 12 per cent.</p><p>Discussion and conclusions. Conclusions have been drawn on the accuracy of the developed mathematical model. The difference is caused by the accuracy in determining the moments of inertia of the section for pure torsion and the stiffness of the support units.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>общая устойчивость</kwd><kwd>механика тонкостенных стержней</kwd><kwd>математическое моделирование</kwd><kwd>общая устойчивость балок</kwd><kwd>расчёт балок</kwd><kwd>изгиб с кручением</kwd></kwd-group><kwd-group xml:lang="en"><kwd>general stability</kwd><kwd>thin-walled beam mechanics</kwd><kwd>mathematical modeling</kwd><kwd>general stability of beams</kwd><kwd>beam calculation</kwd><kwd>bending with torsion</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">Йордановска Д., Смирнов О.М. Расчет коэффициентов потери общей устойчивости стальных холодногнутых профилей методом конечных элементов // Инженерный вестник Дона. 2023. № 10 (106). 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