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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">36840</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2023-19-4-410-418</article-id><article-id pub-id-type="edn">VPVGFF</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Experimental researches</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экспериментальные исследования</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">Experimental and analytical models of longitudinal deformation in pipe-concrete specimens with small cross-sections</article-title><trans-title-group xml:lang="ru"><trans-title>Экспериментальные и аналитические модели продольного деформирования трубобетонных образцов малогабаритных сечений</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1220-6930</contrib-id><name-alternatives><name xml:lang="en"><surname>Khazov</surname><given-names>Pavel A.</given-names></name><name xml:lang="ru"><surname>Хазов</surname><given-names>Павел Алексеевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Theory of Structures and Technical Mechanics, Head of the Laboratory for Continuous Monitoring of the Technical Condition of Buildings and Structures</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры теории сооружений и технической механики, заведующий лабораторией непрерывного контроля технического состояния зданий и сооружений</p></bio><email>khazov.nngasu@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6637-5564</contrib-id><name-alternatives><name xml:lang="en"><surname>Erofeev</surname><given-names>Vladimir I.</given-names></name><name xml:lang="ru"><surname>Ерофеев</surname><given-names>Владимир Иванович</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Physics and Mathematics Sciences, Professor, Director of Institute of Mechanical Engineering Problems</p></bio><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, директор Института проблем машиностроения РАН</p></bio><email>erof.vi@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1189-1062</contrib-id><name-alternatives><name xml:lang="en"><surname>Nikitina</surname><given-names>Elena A.</given-names></name><name xml:lang="ru"><surname>Никитина</surname><given-names>Елена Александровна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor, Senior Researcher of Institute of Mechanical Engineering Problems</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент, старший научный сотрудник Института проблем машиностроения РАН</p></bio><email>nikitina.ea.nn@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-5465-3692</contrib-id><name-alternatives><name xml:lang="en"><surname>Pomazov</surname><given-names>Artyom P.</given-names></name><name xml:lang="ru"><surname>Помазов</surname><given-names>Артём Павлович</given-names></name></name-alternatives><bio xml:lang="en"><p>Postgraduate Student in Department of Structural Theory and Technical Mechanics, Assistant Professor in the Department of Building Structures</p></bio><bio xml:lang="ru"><p>аспирант кафедры теории сооружений и технической механики, ассистент кафедры строительных конструкций</p></bio><email>pomazov.a.p@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Nizhny Novgorod State University of Architecture and Civil Engineering</institution></aff><aff><institution xml:lang="ru">Нижегородский государственный архитектурно-строительный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Mechanical Engineering Problems of the Russian Academy of Sciences - Branch Federal Research Center named after Gaponov-Grekhov of the RAS</institution></aff><aff><institution xml:lang="ru">Институт проблем машиностроения РАН - филиал «Федеральный исследовательский центр Институт прикладной физики им. Гапонова-Грехова Российской академии наук»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-11-15" publication-format="electronic"><day>15</day><month>11</month><year>2023</year></pub-date><volume>19</volume><issue>4</issue><issue-title xml:lang="en">VOL 19, NO4 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 19, №4 (2023)</issue-title><fpage>410</fpage><lpage>418</lpage><history><date date-type="received" iso-8601-date="2023-11-26"><day>26</day><month>11</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Khazov P.A., Erofeev V.I., Nikitina E.A., Pomazov A.P.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Хазов П.А., Ерофеев В.И., Никитина Е.А., Помазов А.П.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Khazov P.A., Erofeev V.I., Nikitina E.A., Pomazov A.P.</copyright-holder><copyright-holder xml:lang="ru">Хазов П.А., Ерофеев В.И., Никитина Е.А., Помазов А.П.</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/36840">https://journals.rudn.ru/structural-mechanics/article/view/36840</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The results of experimental studies of deformation problems in pipeconcrete specimens with small cross sections are provided and analyzed. The stress-strain state of a steel pipe and a pipe filled with concrete is studied and compared. Experimental determination of the dependencies between axial load and deformations of pipe-concrete and steel bars, as well as evaluation of concrete’s and steel pipe’s contribution to the total load-bearing capacity of the composite section are provided. Tests were carried out for short pipe-concrete specimens with the pipe dimensions equal to 60x2, 76x3 and 102x3.5, as well as for hollow steel pipes with the corresponding dimensions. The diagrams of deformation were obtained basing on the experimental results. The deformation of the pipe-concrete element under central compression occurs in proportion to the deformation of a hollow steel element with the same diameter, that made it possible to evaluate the contribution of concrete to the work of the pipe-concrete cross-section, which turned out to be constant at each stage of deformation. A methodology has been proposed that enables to describe analytically the deformability of pipe-concrete elements under axial compression by means of the analytical model based on the experimental data.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Приводятся и анализируются результаты экспериментальных исследований вопросов деформирования трубобетонных образцов малогабаритных сечений. Исследуется и сравнивается напряженно-деформированное состояние стальной трубы и трубы, заполненной бетоном. Приводятся экспериментальное определение зависимостей между осевой нагрузкой и деформациями трубобетонных и стальных стержней, а также оценка вклада бетона и стальной трубы в общую несущую способность составного сечения. Испытания проведены для коротких трубобетонных образцов с размерами трубы 60×2, 76×3 и 102×3,5, а также полых стальных труб с соответствующими размерами. По результатам экспериментов построены диаграммы деформирования. Деформация трубобетонного элемента при центральном сжатии происходит пропорционально деформации полого стального элемента того же диаметра, что позволило оценить вклад бетона в работу трубобетонного сечения, который оказался постоянным на каждом этапе деформирования. Предложена методика, позволяющая аналитически описать деформативность трубобетонных элементов при центральном сжатии при помощи аналитической модели, основанной на экспериментальных данных.</p></trans-abstract><kwd-group xml:lang="en"><kwd>piped concrete</kwd><kwd>experimental studies</kwd><kwd>small-sized sections</kwd><kwd>axial compression</kwd><kwd>triaxial compression</kwd><kwd>bearing capacity</kwd><kwd>stress-strain state</kwd><kwd>deformability</kwd><kwd>mathematical model</kwd><kwd>analytical model</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>трубобетон</kwd><kwd>экспериментальные исследования</kwd><kwd>малогабаритные сечения</kwd><kwd>осевое сжатие</kwd><kwd>трехосное сжатие</kwd><kwd>несущая способность</kwd><kwd>напряженно-деформированное состояние</kwd><kwd>деформативность</kwd><kwd>математическая модель</kwd><kwd>аналитическая модель</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out within the state assignment for fundamental scientific research in 2021–2023 under the project No. 0030-2021-0025.</funding-statement><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания на фундаментальные научные исследования на 2021–2023 годы по теме № 0030-2021-0025.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Lazovic Radovanovic M.M., Nikolic J.Z., Radovanovic J.R., Kostic S.M. 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