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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">39220</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2024-20-2-146-158</article-id><article-id pub-id-type="edn">DSRDSR</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Analysis of thin elastic shells</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Расчет 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 Investigation of Three Thin Shells with Ruled Middle Surfaces with the Same Main Frame</article-title><trans-title-group xml:lang="ru"><trans-title>Геометрическое исследование трех оболочек с линейчатыми срединными поверхностями с одинаковым главным каркасом</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8557-1392</contrib-id><name-alternatives><name xml:lang="en"><surname>Gbaguidi Aisse</surname><given-names>Gerard L.</given-names></name><name xml:lang="ru"><surname>Гбагуиди Аиссе</surname><given-names>Жерар Леопольд</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD of Technical Sciences, Director</p></bio><bio xml:lang="ru"><p>доктор наук, директор</p></bio><email>gbaguidi.gerard@yahoo.fr</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8832-6790</contrib-id><contrib-id contrib-id-type="spin">6004-2422</contrib-id><name-alternatives><name xml:lang="en"><surname>Aleshina</surname><given-names>Olga O.</given-names></name><name xml:lang="ru"><surname>Алёшина</surname><given-names>Ольга Олеговна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Assistant of the Department of Civil Engineering, Engineering Academy</p></bio><bio xml:lang="ru"><p>кандидат технических наук, ассистент департамента строительства инженерной академии</p></bio><email>xiaofeng@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7798-7187</contrib-id><contrib-id contrib-id-type="spin">3632-0177</contrib-id><name-alternatives><name xml:lang="en"><surname>Mamieva</surname><given-names>Iraida A.</given-names></name><name xml:lang="ru"><surname>Мамиева</surname><given-names>Ираида Ахсарбеговна</given-names></name></name-alternatives><bio xml:lang="en"><p>Assistant of the Department of Civil Engineering, Academy of Engineering</p></bio><bio xml:lang="ru"><p>ассистент департамента строительства инженерной академии</p></bio><email>i_mamieva@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Verechaguine AK School of Civil Engineering</institution></aff><aff><institution xml:lang="ru">Высшая школа гражданского строительства им. А.К. Верещагина</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">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="2024-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2024</year></pub-date><volume>20</volume><issue>2</issue><issue-title xml:lang="en">VOL 20, NO2 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 20, №2 (2024)</issue-title><fpage>146</fpage><lpage>158</lpage><history><date date-type="received" iso-8601-date="2024-05-21"><day>21</day><month>05</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Gbaguidi Aisse G.L., Aleshina O.O., Mamieva I.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Гбагуиди Аиссе Ж.Л., Алёшина О.О., Мамиева И.А.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Gbaguidi Aisse G.L., Aleshina O.O., Mamieva I.A.</copyright-holder><copyright-holder xml:lang="ru">Гбагуиди Аиссе Ж.Л., Алёшина О.О., Мамиева И.А.</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/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/39220">https://journals.rudn.ru/structural-mechanics/article/view/39220</self-uri><abstract xml:lang="en"><p style="text-align: justify;">It is proved and illustrated that by taking the main frame of the surface, consisting of three plane curves placed in three coordinate planes, three different algebraic surfaces with the same rigid frame can be designed. For the first time, one three of new ruled surfaces in a family of five threes of ruled surfaces, formed on the basis of some shapes of hulls of river and see ships, which, in turn, are projected in the form of algebraic surfaces with a main frame of three superellipses or of three other plane curves, is under consideration in detail with a standpoint of differential geometry. The geometrical properties of the ruled surfaces taken as the middle surfaces of thin shells for industrial and civil engineering are presented. Analytical formulas for determination of force resultants with using the approximate momentless theory of shells of zero Gaussian curvature given by non-orthogonal conjugate curvilinear coordinates are offered for the first time. The results derived using these formulae will help to correct the results obtained by numerical methods.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Показано и проиллюстрировано, что, взяв каркас поверхности, состоящий из трех плоских кривых, расположенных в трех координатных плоскостях, можно спроектировать три различные алгебраические поверхности с одним и тем же жестким каркасом. Рассмотрена одна тройка новых линейчатых поверхностей в семействе из пяти троек линейчатых поверхностей, сформированных на основе некоторых форм корпусов речных и морских судов, которые, в свою очередь, проецируются в виде алгебраических поверхностей с основным каркасом из трех суперэллипсов или из трех других плоские кривые подробно рассматриваются с точки зрения дифференциальной геометрии. Приводятся геометрические свойства линейчатых поверхностей, взятых в качестве средних поверхностей тонких оболочек для промышленного и гражданского строительства. Предложены аналитические формулы для определения результирующих сил с использованием приближенной безмоментной теории оболочек нулевой гауссовой кривизны, заданных неортогональными сопряженными криволинейными координатами. Результаты, полученные с использованием этих формул, помогут скорректировать результаты, полученные численными методами.</p></trans-abstract><kwd-group xml:lang="en"><kwd>thin shell</kwd><kwd>ruled surface</kwd><kwd>algebraic surface</kwd><kwd>main frame of the surface</kwd><kwd>superellipse</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>тонкая оболочка</kwd><kwd>линейчатая поверхность</kwd><kwd>алгебраическая поверхность</kwd><kwd>главный каркас поверхности</kwd><kwd>суперэллипс</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Krivoshapko S.N. Tangential developable and hydrodynamic surfaces for early stage of ship shape design. 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