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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Structural Mechanics of Engineering Constructions and Buildings</journal-id><journal-title-group><journal-title xml:lang="en">Structural Mechanics of Engineering Constructions and Buildings</journal-title><trans-title-group xml:lang="ru"><trans-title>Строительная механика инженерных конструкций и сооружений</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1815-5235</issn><issn publication-format="electronic">2587-8700</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">30916</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2021-17-6-608-616</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Numerical methods of shell analysis</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Численные методы расчета оболочек</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Numerical analysis of cylindrical shell stability interacting with inhomogeneous soil</article-title><trans-title-group xml:lang="ru"><trans-title>Численный анализ устойчивости цилиндрической оболочки, взаимодействующей с неоднородным окружающим основанием</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3241-0683</contrib-id><name-alternatives><name xml:lang="en"><surname>Kosytsyn</surname><given-names>Sergey B.</given-names></name><name xml:lang="ru"><surname>Косицын</surname><given-names>Сергей Борисович</given-names></name></name-alternatives><bio xml:lang="en"><p>adviser of the Russian Academy of Architecture and Construction Sciences, D.Sc. in Engineering, Professor of the Department of Theoretical Mechanics</p></bio><bio xml:lang="ru"><p>советник РААСН, доктор технических наук, профессор, заведующий кафедрой теоретической механики</p></bio><email>kositsyn-s@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9467-5791</contrib-id><name-alternatives><name xml:lang="en"><surname>Akulich</surname><given-names>Vladimir Yu.</given-names></name><name xml:lang="ru"><surname>Акулич</surname><given-names>Владимир Юрьевич</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD student, Department of Theoretical Mechanics</p></bio><bio xml:lang="ru"><p>аспирант кафедры теоретической механики</p></bio><email>vladimir.akulich@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Russian University of Transport</institution></aff><aff><institution xml:lang="ru">Российский университет транспорта</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-30" publication-format="electronic"><day>30</day><month>12</month><year>2021</year></pub-date><volume>17</volume><issue>6</issue><issue-title xml:lang="en">Prospects for the application of shell structures and thin shells in the first half of the 21st century</issue-title><issue-title xml:lang="ru">Перспективы применения оболочечных структур и тонких оболочек в первой половине XXI в.</issue-title><fpage>608</fpage><lpage>616</lpage><history><date date-type="received" iso-8601-date="2022-04-28"><day>28</day><month>04</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Kosytsyn S.B., Akulich V.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Косицын С.Б., Акулич В.Ю.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Kosytsyn S.B., Akulich V.Y.</copyright-holder><copyright-holder xml:lang="ru">Косицын С.Б., Акулич В.Ю.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/30916">https://journals.rudn.ru/structural-mechanics/article/view/30916</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The research is aimed at determining the critical buckling load of the spatial model “shell - soil” system in the case of inhomogeneous physical and mechanical soil properties along the longitudinal axis of the cylindrical shell in a nonlinear formulations of the task. Methods. The task is solved by a numerical method using a finite element complex ANSYS. Two calculated cases of the spatial model “shell - soil” system are compiled. The soil is divided into two equal parts with different physical and mechanical properties. The problem was solved in geometrically, physically and constructively nonlinear statement. Nonlinearity is due to the need to find the contact zone through an iterative process and determine the time-varying position of the shell. The soil is modeled by volumetric elements, each consisting of twenty nodes. The shell is modeled by flat elements, each consisting of four nodes. Contact elements of one-side action are used. Critical buckling load are determined relative to the actual load of its own weight. Results. Critical loads are obtained from two calculated cases of the spatial model “shell - soil” system. There is a comparative analysis of the results. An assessment of the stability margin of the shell relative to the actual load is given.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Цель исследования - определить критическую нагрузку пространственной модели системы «оболочка - основание» в случае неоднородных физико-механических свойств основания вдоль продольной оси цилиндрической оболочки в нелинейной постановке задачи. Методы . Задача решена численным методом с использованием программного конечно-элементного комплекса ANSYS. Выполнено два расчетных случая пространственной модели системы «оболочка - основание» с учетом и без учета коэффициента трения между оболочкой и окружающим основанием. Окружающее основание разделено на два равных массива с разными физико-механическими свойствами. Расчет проведен в геометрически, физически и конструктивно нелинейных постановках. Нелинейность обусловлена необходимостью посредством итерационного процесса отыскания зоны контакта элементов (область отлипания оболочки от основания) и определения изменяющегося во времени положения оболочки. Расчетная модель составлена из двумерных плоских четырехузловых элементов оболочки и трехмерных тетраэдральных десятиузловых элементов окружающего основания. Применены односторонние контактные элементы. Критические нагрузки установлены относительно действующей нагрузки от собственного веса. Результаты. Получены критические нагрузки от двух расчетных случаев пространственной модели системы «оболочка - основание». Произведен сравнительный анализ результатов. Дана оценка запаса устойчивости оболочки относительно действующей нагрузки.</p></trans-abstract><kwd-group xml:lang="en"><kwd>shell stability</kwd><kwd>stability margin</kwd><kwd>contact interaction</kwd><kwd>finite elements</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>устойчивость оболочки</kwd><kwd>запас устойчивости</kwd><kwd>контактное взаимодействие</kwd><kwd>конечные элементы</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Lalin V.V., Dmitriev A.N., Diakov S.F. Nonlinear deformation and stability of geometrically exact elastic arches. Magazine of Civil Engineering. 2019;5(89):39–51. http://dx.doi.org/10.18720/MCE.89.4</mixed-citation><mixed-citation xml:lang="ru">Lalin V.V., Dmitriev A.N., Diakov S.F. Nonlinear deformation and stability of geometrically exact elastic arches // Magazine of Civil Engineering. 2019. Vol. 5. No. 89. 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