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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">20428</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2018-14-6-502-508</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Thin Elastic Shells Theory</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Теория тонких упругих 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">Geometric modeling and linear static analysis of thin shells in the form of cylindroids</article-title><trans-title-group xml:lang="ru"><trans-title>Геометрическое моделирование и линейный статический расчет тонких оболочек в форме цилиндроидов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gil-oulbé</surname><given-names>Mathieu</given-names></name><name xml:lang="ru"><surname>Жиль-улбе</surname><given-names>Матье</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD in Technical Sciences, Associate Professor, Department of Civil Engineering, Engineering Academy</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент департамента строительства, Инженерная академия</p></bio><email>giloulbem@hotmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Qbaily</surname><given-names>Jaafar</given-names></name><name xml:lang="ru"><surname>Кбейли</surname><given-names>Джаафар</given-names></name></name-alternatives><bio xml:lang="en"><p>Master's degree student, Department of Civil Engineering, Engineering Academy</p></bio><bio xml:lang="ru"><p>магистрант департамента строительства, Инженерная академия</p></bio><email>jaafarqbaily@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples' Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2018-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2018</year></pub-date><volume>14</volume><issue>6</issue><issue-title xml:lang="en">VOL 14, NO6 (2018)</issue-title><issue-title xml:lang="ru">ТОМ 14, №6 (2018)</issue-title><fpage>502</fpage><lpage>508</lpage><history><date date-type="received" iso-8601-date="2019-01-29"><day>29</day><month>01</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2018, Gil-oulbé M., Qbaily J.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2018, Жиль-улбе М., Кбейли Д.</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="en">Gil-oulbé M., Qbaily J.</copyright-holder><copyright-holder xml:lang="ru">Жиль-улбе М., Кбейли Д.</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/20428">https://journals.rudn.ru/structural-mechanics/article/view/20428</self-uri><abstract xml:lang="en"><p>Aims. Thin shells in the form of cylindroids are fourth-degree ruled shells for which few works are devoted. In this paper, their geometric modeling is worked out and their middle surface are plotted, using the software MathCAD. Their stress-strain state are instigated with two building material: reinforcement concert and qualitative steel. Methods. This linear investigation is done for fixed and hinged supports and for various thicknesses in the software SCAD. The numerical values of their maximum and minimum displacements of their middle surfaces are given. Based on these displacements, conclusions are made for the whole paper. Results. The linear analysis for reinforced concrete and metallic shells, computed using the software SCAD gives the numerical and graphical results that are presented. Conclusions. The investigations of the stress-strain state are done for shells with the shape of cylindroid with two directrices ellipses and cylindroid Frazer. For the same thickness, loading and span, the reinforced concrete shells has minimum displacements. For thickness, 20 cm the steel shells have the same maximum displacements. For the thickness 30 cm the maximum displacement is more in steel shells. It is more optimal to use reinforced concrete shells than the one in steel. A large span (till 30 m) shells can be designed with reinforced concrete.</p></abstract><trans-abstract xml:lang="ru"><p>Цель. Тонкие оболочки в виде цилиндроидов представляют собой линейчатые оболочки. Их изучению посвящено несколько работ. В данной статье выработано геометрическое моделирование тонких оболочек в виде цилиндроидов и построены срединные поверхности с помощью программного обеспечения MathCAD. Напряженнодеформированное состояние исследовано для стальных и железобетонных оболочек в форме цилиндроидов. Методы. Линейное исследование выполнено для жестко защемленных и шарнирных опор, а также для различных толщин в программном комплексе SCAD. Приведены численные значения максимального и минимального перемещений их средних поверхностей, на основе которых сделаны выводы. Результаты. Данные, полученные путем линейного расчета железобетонных и металлических оболочек, выполненого с помощью программного обеспечения SCAD, представлены в числовом и графическом виде. Заключение. Исследования напряженно-деформированного состояния проведены для оболочек в форме цилиндроида с двумя прямыми эллипсами и цилиндроида Фрезера. При одинаковых толщине, нагрузке и пролете железобетонные оболочки имеют минимальные перемещения. Для толщины 20 см стальные оболочки имеют одинаковые максимальные перемещения. Для толщины 30 см максимальное перемещение больше в стальных оболочках. Оболочки большого пролета (до 30 м) могут быть спроектированы из железобетона.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cylindroid surfaces</kwd><kwd>linear investigation</kwd><kwd>geometric modeling</kwd><kwd>stress-strain state</kwd><kwd>displacements</kwd><kwd>middle surfaces</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>поверхности цилиндроидов</kwd><kwd>линейное исследование</kwd><kwd>геометрическое моделирование</kwd><kwd>напряженно-деформированное состояние</kwd><kwd>перемещение срединой поверхности</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">Wang Z.Z., Jiang L.Y. (2011). Analysis of Cylindroid Shell Subject to Internal Linearly-Increased Pressure. Advanced Materials Research, 239-242, 2584-2589.</mixed-citation><mixed-citation xml:lang="ru">Wang Z.Z., Jiang L.Y. 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