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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">21803</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2019-15-4-261-270</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Analysis and design of building structures</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Расчет и проектирование строительных конструкций</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">Theory of “dissolution” and “condensation” of the physical geometric characteristics of an arbitrary cross-section under the action of torsion with bending</article-title><trans-title-group xml:lang="ru"><trans-title>Теория «растворения» и «конденсации» физико-геометрических характеристик поперечного сечения произвольной формы при кручении стержней</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kolchunov</surname><given-names>Vladimir I.</given-names></name><name xml:lang="ru"><surname>Колчунов</surname><given-names>Владимир Иванович</given-names></name></name-alternatives><bio xml:lang="en"><p>DSc. in Technical Sciences, Professor of the Department of Unique Buildings and Structures</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор кафедры уникальных зданий и сооружений</p></bio><email>vlik52@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Demyanov</surname><given-names>Aleksej I.</given-names></name><name xml:lang="ru"><surname>Демьянов</surname><given-names>Алексей Иванович</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD in Technical Sciences, Associate Professor of the Department of Unique Buildings and Structures</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры уникальных зданий и сооружений.</p></bio><email>vlik52@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Naumov</surname><given-names>Nikolay V.</given-names></name><name xml:lang="ru"><surname>Наумов</surname><given-names>Николай Валерьевич</given-names></name></name-alternatives><bio xml:lang="en"><p>graduate student of the Department of Unique Buildings and Structures.</p></bio><bio xml:lang="ru"><p>аспирант кафедры уникальных зданий и сооружений</p></bio><email>vlik52@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">South-West State University</institution></aff><aff><institution xml:lang="ru">Юго-Западный государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>15</volume><issue>4</issue><issue-title xml:lang="en">VOL 15, NO4 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 15, №4 (2019)</issue-title><fpage>261</fpage><lpage>270</lpage><history><date date-type="received" iso-8601-date="2019-09-22"><day>22</day><month>09</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Kolchunov V.I., Demyanov A.I., Naumov N.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Колчунов В.И., Демьянов А.И., Наумов Н.В.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Kolchunov V.I., Demyanov A.I., Naumov N.V.</copyright-holder><copyright-holder xml:lang="ru">Колчунов В.И., Демьянов А.И., Наумов Н.В.</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/21803">https://journals.rudn.ru/structural-mechanics/article/view/21803</self-uri><abstract xml:lang="en"><p>Aim of research - to continue the development of methods for determining the stress-strain state of rods during torsion using materials resistance methods. Methods. A new approach for determining tangential torsional stresses for arbitrary cross sectional rods, based on simplified assumptions of material resistance, is proposed. The main feature of this approach is the approximation of rectangular or any complex cross section of reinforced concrete structures by describing a large circle around the cross section and splitting it into small squares with circles inscribed into them. Results. Three theorems have been formulated, the first of which relates the accumulation of tangential stresses (increments) from the edges of a rectangle to the middle of a rectangular section with the formula for determining tangent stresses for round sections. The second theorem allows to establish a connection between the tangential stresses calculated for each of the small squares-circles and the tangent stresses of the large circle through their increments. The third theorem makes it possible to find tangential stresses for each of the small square circles. The proposed approach allows to remove the need to use special tables for the calculation and not only in the elastic stage. It also makes it possible to separate the stress-strain state in the whole set of round cross-sections from the additional field caused by the deplanation of the rectangular cross-section. In addition, the proposed approach makes it possible to take into account the concentration of angular deformations in the incoming angles and other places with changing geometric parameters.</p></abstract><trans-abstract xml:lang="ru"><p>Цель исследования заключается в продолжении разработки методики определения напряженно-деформированного состояния стержней при кручении методами сопротивления материалов. Методы. Предложен новый подход определения касательных напряжений кручения для стержней произвольного поперечного сечения, базирующийся на упрощенных предпосылках сопротивления материалов. Особенность подхода заключается в аппроксимации прямоугольных и любых сложных поперечных сечений железобетонных конструкций путем описывания вокруг поперечного сечения большого круга с последующим его разбиением на малые квадраты с вписанными в них кругами. Результаты. Сформулированы три теоремы, первая из которых связывает накопление касательных напряжений (приращения) от граней прямоугольника до середины прямоугольного сечения с формулой определения касательных напряжений для круглых сечений. Вторая теорема позволяет установить связь между касательными напряжениями, вычисленными для каждого из малых квадратов-кругов, и касательными напряжениями большого круга через их приращение Третья теорема дает возможность найти касательные напряжения для каждого из малых квадратовкругов. Предложенный подход позволяет снять вопрос о необходимости использования специальных таблиц для расчета и не только в упругой стадии. Он также позволяет отделить напряженно-деформированное состояние в целом наборе круглых сечений от дополнительного поля, связанного с депланацией прямоугольного сечения. Помимо этого, представленные подходы дают возможность учитывать концентрацию угловых деформаций во входящих углах и других резко изменяющихся геометрических параметрах.</p></trans-abstract><kwd-group xml:lang="en"><kwd>calculation methodics</kwd><kwd>torsion</kwd><kwd>stress-strain state</kwd><kwd>resistance of materials</kwd><kwd>deplanation</kwd><kwd>concentration</kwd><kwd>dissolution</kwd><kwd>condensation</kwd><kwd>static geometric characteristics</kwd><kwd>reinforced concrete rods</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>методика расчета</kwd><kwd>кручение</kwd><kwd>напряженно-деформированное состояние</kwd><kwd>сопротивление материалов</kwd><kwd>депланация</kwd><kwd>концентрация</kwd><kwd>растворение</kwd><kwd>конденсация</kwd><kwd>статико-геометрические характеристики</kwd><kwd>железобетонные стержни</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">Golyshev A.B. 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