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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">37221</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2023-19-5-491-501</article-id><article-id pub-id-type="edn">HSRVMZ</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">Algorithm for calculating the problem of unilateral frictional contact with an increscent external load parameter</article-title><trans-title-group xml:lang="ru"><trans-title>Алгоритм расчета задачи одностороннего контакта с трением с нарастающим параметром внешней нагрузки</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6762-5476</contrib-id><name-alternatives><name xml:lang="en"><surname>Popov</surname><given-names>Alexander N.</given-names></name><name xml:lang="ru"><surname>Попов</surname><given-names>Александр Николаевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Lecturer-researcher at the Higher school of Industrial and Civil Engineering</p></bio><bio xml:lang="ru"><p>преподаватель-исследователь высшей школы промышленного и гражданского строительства</p></bio><email>SanyaPov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5050-466X</contrib-id><name-alternatives><name xml:lang="en"><surname>Lovtsov</surname><given-names>Alexander D.</given-names></name><name xml:lang="ru"><surname>Ловцов</surname><given-names>Александр Дмитриевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Dr. of Engineering, Professor at the Higher school of Industrial and Civil Engineering</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор высшей школы промышленного и гражданского строительства</p></bio><email>lad@pnu.edu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Pacific National University</institution></aff><aff><institution xml:lang="ru">Тихоокеанский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2023</year></pub-date><volume>19</volume><issue>5</issue><issue-title xml:lang="en">VOL 19, NO5 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 19, №5 (2023)</issue-title><fpage>491</fpage><lpage>501</lpage><history><date date-type="received" iso-8601-date="2023-12-28"><day>28</day><month>12</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Popov A.N., Lovtsov A.D.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Попов А.Н., Ловцов А.Д.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Popov A.N., Lovtsov A.D.</copyright-holder><copyright-holder xml:lang="ru">Попов А.Н., Ловцов А.Д.</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/37221">https://journals.rudn.ru/structural-mechanics/article/view/37221</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The subject of the study is the contact interaction of deformable elements of linear complementarity problem (LCP). To solve the linear complementarity problem, the Lemke method with the introduction of an increasing parameter of external loading is used. The proposed approach solves the degenerated matrix in a finite number of steps, while the dimensionality of the problem is limited to the area of contact. To solve the problem, the initial table of the Lemke method is generated using the contact matrix of stiffness and the contact load vector. The unknowns in the problem are mutual displacements and interaction forces of contacting pairs of points of deformable solids. The proposed approach makes it possible to evaluate the change in working schemes as the parameter of external load increases. The features of the proposed formulation of the problem are shown, the criteria for stopping the stepwise process of solving such problems are considered. Model examples for the proposed algorithm are given. The algorithm has shown its efficiency in application, including for complex model problems. Recommendations on the use of the proposed approach are given.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Предметом исследования является контактное взаимодействие деформируемых элементов строительных конструкций. Для решения задачи моделирования одностороннего взаимодействия с учетом трения в зоне контакта чаще всего используются вариационные постановки. Предлагается альтернатива популярным постановкам дискретизованных задач и итерационным методам их решения. Задача контакта с трением расширяется в виде линейной задачи дополнительности. Для решения линейной задачи дополнительности применяется метод Лемке с введением нарастающего параметра внешнего нагружения. В предлагаемом подходе решается вырожденная матрица за конечное число шагов, при этом размерность задачи ограничена областью контакта. Для решения задачи формируется начальная таблица метода Лемке с использованием контактной матрицы жесткости и контактного грузового вектора. В качестве неизвестных в задаче выступают взаимные перемещения и усилия взаимодействия контактирующих пар точек, деформируемых тел. Предлагаемый подход позволяет оценить смену рабочих схем по мере роста параметра внешнего воздействия. Показаны особенности предлагаемой постановки задачи, рассмотрены критерии остановки шагового процесса решения таковых задач. Приведены модельные примеры для предлагаемого алгоритма. Алгоритм показал свою эффективность в применении, в том числе и на сложных модельных задачах. Даны рекомендации по использованию предлагаемого подхода.</p></trans-abstract><kwd-group xml:lang="en"><kwd>building structures</kwd><kwd>structural nonlinearity</kwd><kwd>unilateral links</kwd><kwd>linear complementarity problem</kwd><kwd>numerical models</kwd><kwd>finite element method</kwd><kwd>increasing load</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>строительные конструкции</kwd><kwd>конструктивная нелинейность</kwd><kwd>односторонние связи</kwd><kwd>линейная задача дополнительности</kwd><kwd>численные модели</kwd><kwd>метод конечных элементов</kwd><kwd>нарастающая нагрузка</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Migórski S. Optimal Control of History-Dependent Evolution Inclusions with Applications to Frictional Contact. 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