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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">39222</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2024-20-2-170-181</article-id><article-id pub-id-type="edn">HHPHBS</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">Stress-Strain State of Steel Fiber-Reinforced Concrete under Compression Taking into Account Unloading from Inelastic Region</article-title><trans-title-group xml:lang="ru"><trans-title>Напряженно-деформированное состояние сталефибробетона при сжатии с учетом разгрузки из области неупругих деформаций</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1749-5797</contrib-id><contrib-id contrib-id-type="spin">2422-0104</contrib-id><name-alternatives><name xml:lang="en"><surname>Agapov</surname><given-names>Vladimir P.</given-names></name><name xml:lang="ru"><surname>Агапов</surname><given-names>Владимир Павлович</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor of the Department of Civil Engineering, Engineering Academy</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор департамента строительства инженерной академии</p></bio><email>agapovpb@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3967-2114</contrib-id><contrib-id contrib-id-type="spin">9203-1434</contrib-id><name-alternatives><name xml:lang="en"><surname>Markovich</surname><given-names>Alexey S.</given-names></name><name xml:lang="ru"><surname>Маркович</surname><given-names>Алексей Семенович</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Civil Engineering, Academy of Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент департамента строительства инженерной академии</p></bio><email>markovich-as@rudn.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7888-5350</contrib-id><contrib-id contrib-id-type="spin">5670-7662</contrib-id><name-alternatives><name xml:lang="en"><surname>Dkhar</surname><given-names>Prashanta</given-names></name><name xml:lang="ru"><surname>Дхар</surname><given-names>Прашанта</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Senior Lecturer of the Department of Civil Engineering, Academy of Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, старший преподаватель департамента строительства инженерной академии</p></bio><email>dkhar-p@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0835-528X</contrib-id><contrib-id contrib-id-type="spin">1276-6516</contrib-id><name-alternatives><name xml:lang="en"><surname>Golishevskaia</surname><given-names>Darya A.</given-names></name><name xml:lang="ru"><surname>Голишевская</surname><given-names>Дарья Александровна</given-names></name></name-alternatives><bio xml:lang="en"><p>Assistant of the Department of Civil Engineering, Academy of Engineering</p></bio><bio xml:lang="ru"><p>ассистент департамента строительства инженерной академии</p></bio><email>miloserdova-da@rudn.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><aff-alternatives id="aff2"><aff><institution xml:lang="en">National Research Moscow State University of Civil Engineering</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Московский государственный строительный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2024</year></pub-date><volume>20</volume><issue>2</issue><issue-title xml:lang="en">VOL 20, NO2 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 20, №2 (2024)</issue-title><fpage>170</fpage><lpage>181</lpage><history><date date-type="received" iso-8601-date="2024-05-21"><day>21</day><month>05</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Agapov V.P., Markovich A.S., Dkhar P., Golishevskaia D.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Агапов В.П., Маркович А.С., Дхар П., Голишевская Д.А.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Agapov V.P., Markovich A.S., Dkhar P., Golishevskaia D.A.</copyright-holder><copyright-holder xml:lang="ru">Агапов В.П., Маркович А.С., Дхар П., Голишевская Д.А.</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/39222">https://journals.rudn.ru/structural-mechanics/article/view/39222</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The purpose of the study is to examine the physical and mechanical characteristics of steel fiber-reinforced concrete under compression, including: modulus of elasticity, Poisson ratio, values of ultimate strains under compression, values of compressive strength with different percentages of dispersed reinforcement. An experimental investigation program, which included the production of cube samples measuring 100×100×100 mm, as well as a compression test under static loading, taking into account unloading from the region of inelastic deformations, was developed and carried out. Two types of steel fiber were chosen as dispersed reinforcement: hooked end and wave shape. The volume content of steel fiber in the cube samples was 0.5, 1.0, 1.5 and 2.0 %. As a result of the investigation, the strength and deformation characteristics of steel fiber reinforced concrete under compression were obtained. Based on the experimental data, actual strain diagrams of steel fiber reinforced concrete were constructed, taking into account the type of reinforcing fibers and the percentage of reinforcing fiber. Based on the obtained diagrams, a law of deformation of steel fiber reinforced concrete is proposed, which can be described by a polynomial function of the fourth order with constant coefficients that determine the shape of the stress-strain curve. The presented research results can be used in developing a methodology for physically nonlinear analysis of steel fiber reinforced concrete elements with a percentage of dispersed reinforcement from 0.5 to 2.0 %.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Исследованы физико-механические характеристики сталефибробетона при сжатии, в том числе модуль упругости, коэффициент Пуассона, значения предельных деформаций при сжатии, величина прочности с различным процентом дисперсного армирования. Разработана и проведена программа экспериментальных исследований, которая включала в себя изготовление образцов-кубов, размером 100×100×100 мм, а также испытание на сжатие при статическом нагружении с учетом разгрузки из области неупругих деформаций. В качестве дисперсного армирования было выбрано два вида стальной фибры: анкерного и волнового профиля. Объемное содержание стального волокна в образцах кубах составляло 0,5, 1,0, 1,5 и 2,0 %. Получены прочностные и деформационные характеристики сталефибробетона при сжатии. На основе экспериментальных данных построены действительные диаграммы деформирования сталефибробетона с учетом типа армирующих волокон и процентного содержания армирующего волокна. На основе полученных диаграмм предложен закон деформирования сталефибробетона, который можно описать полиномиальной функцией четвертой степени с постоянными коэффициентами, определяющими вид кривой «напряжение - деформация». Приведенные результаты исследования могут быть использованы при разработке методики физически нелинейных расчетов сталефибробетонных элементов с процентом дисперсного армирования от 0,5 до 2,0 %.</p></trans-abstract><kwd-group xml:lang="en"><kwd>steel fiber-reinforced concrete</kwd><kwd>steel fiber</kwd><kwd>modulus of elasticity</kwd><kwd>ultimate strain</kwd><kwd>compressive strength</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>сталефибробетон</kwd><kwd>стальное волокно</kwd><kwd>модуль упругости</kwd><kwd>предельная деформация</kwd><kwd>прочность на сжатие</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">Rabinovich F.N. Composites based on dispersed reinforced concrete. Questions of theory and design, technology,constructions: monograph. Moscow: ASV Publ.; 2011. (In Russ.) EDN: QNPRVR</mixed-citation><mixed-citation xml:lang="ru">Рабинович Ф.Н. 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