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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">48303</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2025-21-5-377-388</article-id><article-id pub-id-type="edn">DQGYSO</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">Construction of Developable Surfaces with Two Director Curves</article-title><trans-title-group xml:lang="ru"><trans-title>Построение торсовых поверхностей на двух направляющих кривых</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9385-3699</contrib-id><contrib-id contrib-id-type="spin">2021-6966</contrib-id><name-alternatives><name xml:lang="en"><surname>Krivoshapko</surname><given-names>Sergey N.</given-names></name><name xml:lang="ru"><surname>Кривошапко</surname><given-names>Сергей Николаевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Consulting Professor of the Department of Construction Technology and Structural Materials, Academy of Engineering</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор-косультант кафедры технологий строительства и конструкционных материалов, инженерная академия</p></bio><email>sn_krivoshapko@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><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="2025-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2025</year></pub-date><volume>21</volume><issue>5</issue><issue-title xml:lang="en">VOL 21, NO5 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 21, №5 (2025)</issue-title><fpage>377</fpage><lpage>388</lpage><history><date date-type="received" iso-8601-date="2026-01-31"><day>31</day><month>01</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Krivoshapko S.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Кривошапко С.Н.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Krivoshapko S.N.</copyright-holder><copyright-holder xml:lang="ru">Кривошапко С.Н.</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/48303">https://journals.rudn.ru/structural-mechanics/article/view/48303</self-uri><abstract xml:lang="en"><p>An analysis of a number of published materials regarding four types of developable surfaces with two director (supporting) algebraic curves of the second order lying in parallel or in intersecting planes has been conducted. Three types of developable surfaces are shortly described with references to sources, and visualizations of each type of developable surface are presented. For the developable surfaces with two supporting curves with intersecting axes in intersecting planes, the construction technique and the method of obtaining parametric equations are given. This method is illustrated with three examples. It is established that to date, there are no studies on the strength of thin shells in the form of the presented developable surfaces defined in curvilinear conjugate non-orthogonal coordinates that coincide with the external contour of the shells. It is shown that there are suggestions of application of the studied surfaces in architecture, shipbuilding, and agricultural machine engineering.</p></abstract><trans-abstract xml:lang="ru"><p>Проведен анализ ряда опубликованных материалов по четырем типам торсовых поверхностей с двумя направляющими (опорными) алгебраическими кривыми второго порядка, лежащими в параллельных или пересекающихся плоскостях. Три типа торсов описаны кратко со ссылками на источники и приведены графические иллюстрации для каждого типа торсов, а для торсовых поверхностей с двумя опорными кривыми с пересекающимися осями в пересекающихся плоскостях представлен порядок построения этой поверхности и методика получения параметрических уравнений. Методика проиллюстрирована на трех примерах. Установлено, что до настоящего времени нет ни одного исследования напряженно-деформированного состояния предложенных тонких торсовых оболочек, заданных в криволинейных неортогональных сопряженных координатах, которые совпадают с внешним контуром торсовых оболочек. Показано, что есть предложения по применению предложенных поверхностей в архитектуре, судостроении и сельскохозяйственном машиностроении.</p></trans-abstract><kwd-group xml:lang="en"><kwd>parallel vectors</kwd><kwd>vector coplanarity</kwd><kwd>second-order algebraic curves</kwd><kwd>developable surface with two director curves</kwd><kwd>surface modelling</kwd><kwd>computer graphics</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>параллельность векторов</kwd><kwd>компланарность векторов</kwd><kwd>алгебраические кривые второго порядка</kwd><kwd>торс с двумя направляющими кривыми</kwd><kwd>моделирование поверхностей</kwd><kwd>компьютерная графика</kwd></kwd-group><funding-group/></article-meta><fn-group/></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Krivoshapko S.N. Torse surfaces on a rectangular plan with two plane curves on the opposite ends. Building and Reconstruction. 2025;1(117):3–15. 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