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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">34424</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2023-19-1-73-83</article-id><article-id pub-id-type="edn">FYSMCV</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Analytical and numerical methods of analysis of structures</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Аналитические и численные методы расчета 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">Statics and dynamics of curved rods based on Bernoulli hypotheses and relations for a rectilinear rod</article-title><trans-title-group xml:lang="ru"><trans-title>Статика и динамика криволинейных стержней на основе гипотез Бернулли и соотношений для прямолинейного стержня</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7222-1935</contrib-id><contrib-id contrib-id-type="spin">9043-5123</contrib-id><name-alternatives><name xml:lang="en"><surname>Serazutdinov</surname><given-names>Murat N.</given-names></name><name xml:lang="ru"><surname>Серазутдинов</surname><given-names>Мурат Нуриевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Physical and Mathematical Sciences, Professor of the Department of Fundamentals of Design and Applied Mechanics</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор кафедры основ проектирования и прикладной механики</p></bio><email>serazmn@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazan National Research Technological University</institution></aff><aff><institution xml:lang="ru">Казанский национальный исследовательский технологический университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-30" publication-format="electronic"><day>30</day><month>03</month><year>2023</year></pub-date><volume>19</volume><issue>1</issue><issue-title xml:lang="en">VOL 19, NO1 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 19, №1 (2023)</issue-title><fpage>73</fpage><lpage>83</lpage><history><date date-type="received" iso-8601-date="2023-04-15"><day>15</day><month>04</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Serazutdinov M.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Серазутдинов М.Н.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Serazutdinov M.N.</copyright-holder><copyright-holder xml:lang="ru">Серазутдинов М.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/34424">https://journals.rudn.ru/structural-mechanics/article/view/34424</self-uri><abstract xml:lang="en"><p style="text-align: justify;">Method for calculating the statics and dynamics of curved rods, based on the equations for a rectilinear rod, is described and justified in detail. Bernoulli's hypotheses and the variational method are applied. The main advantage and special feature of these formulas is that the simplest formulas that are valid for rectilinear rods are used for the calculations of curved rods. These formulas do not contain parameters characterizing the curvatures of the longitudinal axis of the rod. This feature is an essential factor in the calculation of curved rods, where the information about their longitudinal axis is given discretely, since no special methods of approximation of discretely given data are required, which enable to obtain information about the radius-vector of the rod longitudinal axis and its derivatives with the required high accuracy. Solutions of test static and dynamic problems are provided. Bending of a rod with a longitudinal axis in the form of a circle, a naturally twisted rod, and a spring fluctuation are considered. Comparison of the calculation results with the data published in the literature illustrates the reliability and high accuracy of the solutions obtained.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Описывается и подробно обосновывается метод расчета статики и динамики криволинейных стержней, основанный на соотношениях для прямолинейного стержня. Используются гипотезы Бернулли и вариационный метод. Основное достоинство и особенность используемых соотношений состоит в том, что для расчетов криволинейных стержней применяются простейшие формулы, справедливые для прямолинейных стержней. В эти формулы не входят параметры, характеризующие кривизны продольной оси стержня. Данная особенность является существенным фактором при расчете криволинейных стержней, информация о продольной оси которых задается дискретно, так как не требуется использование специальных методов аппроксимации дискретно заданных данных, позволяющих получать информацию о радиусе-векторе продольной оси стержня и его производных с требуемой высокой точностью. Представлены решения тестовых статических и динамической задач. Рассмотрены изгиб стержня с продольной осью в виде окружности, естественно закрученного стержня и колебания пружины. Сравнение результатов расчета с опубликованными в литературе данными иллюстрирует достоверность и высокую точность получаемых решений.</p></trans-abstract><kwd-group xml:lang="en"><kwd>curved rods</kwd><kwd>Bernoulli hypotheses</kwd><kwd>statics</kwd><kwd>dynamics</kwd><kwd>calculation method</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>криволинейные стержни</kwd><kwd>гипотезы Бернулли</kwd><kwd>статика</kwd><kwd>динамика</kwd><kwd>метод расчета</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">Shulkin Yu.B. Theory of elastic rod structures. Moscow: Nauka Publ.; 1984. (In Russ.)</mixed-citation><mixed-citation xml:lang="ru">Шулькин Ю.Б. Теория упругих стержневых конструкций: монография. М.: Наука, 1984. 271 с.</mixed-citation></citation-alternatives></ref><ref id="B2"><label>2.</label><citation-alternatives><mixed-citation xml:lang="en">Svetlitsky V.A. 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