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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">46935</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2025-21-4-307-320</article-id><article-id pub-id-type="edn">CFFLUI</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">Stress-Strain State of an Orthotropic Rectangular Plate Simply Supported on All Sides</article-title><trans-title-group xml:lang="ru"><trans-title>Напряженно-деформированное состояние ортотропной прямоугольной пластинки, свободно опертой по всем сторонам</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-6962-9355</contrib-id><contrib-id contrib-id-type="spin">9726-5456</contrib-id><name-alternatives><name xml:lang="en"><surname>Shagivaleev</surname><given-names>Kamil F.</given-names></name><name xml:lang="ru"><surname>Шагивалеев</surname><given-names>Камиль Фатыхович</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Building Materials, Structures and Technologies</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры строительных материалов, конструкций и технологий</p></bio><email>kfshag@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-5373-8804</contrib-id><contrib-id contrib-id-type="spin">9654-2120</contrib-id><name-alternatives><name xml:lang="en"><surname>Surnin</surname><given-names>Dmitry A.</given-names></name><name xml:lang="ru"><surname>Сурнин</surname><given-names>Дмитрий Аркадьевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Postgraduate student of the Department of Transport Construction</p></bio><bio xml:lang="ru"><p>аспирант кафедры транспортного строительства</p></bio><email>dasurnin98@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2500-1256</contrib-id><contrib-id contrib-id-type="spin">5584-2282</contrib-id><name-alternatives><name xml:lang="en"><surname>Surnina</surname><given-names>Elena K.</given-names></name><name xml:lang="ru"><surname>Сурнина</surname><given-names>Елена Камилевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Transport Construction</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры транспортного строительства</p></bio><email>eksurnina@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Saratov State Technical University named after Yu.A. Gagarin</institution></aff><aff><institution xml:lang="ru">Саратовский государственный технический университет имени Гагарина Ю.А.</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-11-05" publication-format="electronic"><day>05</day><month>11</month><year>2025</year></pub-date><volume>21</volume><issue>4</issue><issue-title xml:lang="en">VOL 21, NO4 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 21, №4 (2025)</issue-title><fpage>307</fpage><lpage>320</lpage><history><date date-type="received" iso-8601-date="2025-11-05"><day>05</day><month>11</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Shagivaleev K.F., Surnin D.A., Surnina E.K.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Шагивалеев К.Ф., Сурнин Д.А., Сурнина Е.К.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Shagivaleev K.F., Surnin D.A., Surnina E.K.</copyright-holder><copyright-holder xml:lang="ru">Шагивалеев К.Ф., Сурнин Д.А., Сурнина Е.К.</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/46935">https://journals.rudn.ru/structural-mechanics/article/view/46935</self-uri><abstract xml:lang="en"><p>Abstract. In view of the wide application of composite structures in engineering practice, an important task is to study their stress-strain state under the action of various loads. An orthotropic rectangular plate simply supported on four sides was considered. The stress-strain state of the plate under the action of a normally applied load was investigated. General analytical expressions are obtained that allow determining the stress-strain state in an orthotropic plate for different geometric parameters of the plate, for different elastic characteristics of the plate material and for different dimensions of the loading area. Using the derived general analytical expressions, various particular solutions can be obtained: under the action of a normal load applied over the entire surface of the plate, under the action of local and concentrated loads. The results of calculations of an orthotropic carbon fiber plate under the action of a uniformly distributed load applied over the entire surface of the plate are presented as a test problem. To obtain the resolving differential equation, operational calculus associated with the Laplace transform was used.</p></abstract><trans-abstract xml:lang="ru"><p>Ввиду широкого применения в инженерной практике конструкций из композитных материалов актуальной задачей является исследование их напряженно-деформированного состояния при действии различных нагрузок. Рассматривалась свободно опертая по четырем сторонам ортотропная прямоугольная пластинка. Исследовалось напряженно-деформированное состояние пластинки под действием нормально приложенной нагрузки. Для получения разрешающего дифференциального уравнения использовалось операционное исчисление, связанное с преобразованием Лапласа. Получены в общем виде аналитические выражения, которые позволяют определять напряженно-деформированное состояние в ортотропной пластинке при разных геометрических параметрах пластинки, при разных упругих характеристиках материала пластинки и при разных размерах площадки нагружения. Используя выведенные общие аналитические выражения, можно получить различные частные решения: при действии нагрузки, нормально приложенной по всей поверхности пластинки, при действии локальных и сосредоточенных нагрузок. В качестве тестовой задачи представлены результаты расчетов ортотропной пластинки из углепластика при действии нагрузки, равномерно распределенной по всей поверхности пластинки.</p></trans-abstract><kwd-group xml:lang="en"><kwd>composite material</kwd><kwd>load</kwd><kwd>differential equation</kwd><kwd>operational calculus</kwd><kwd>original</kwd><kwd>image</kwd><kwd>analytical solution</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>композиционный материал</kwd><kwd>нагрузка</kwd><kwd>дифференциальное уравнение</kwd><kwd>операционное исчисление</kwd><kwd>оригинал</kwd><kwd>изображение</kwd><kwd>аналитическое решение</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">Leng B., Xu H., Yan Y., Wang K., Yang G., Meng Y. An Analytical Solution for the Bending of Anisotropic Rectangular Thin Plates with Elastic Rotation Supports. 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