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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">31566</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2022-18-2-111-139</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Analysis and design of building structures</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Расчет и проектирование строительных 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">Optimization of channels and I-shaped bended closed profiles with perforated walls</article-title><trans-title-group xml:lang="ru"><trans-title>Оптимизация швеллерных и двутавровых гнутозамкнутых профилей с перфорированными стенками</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5464-5929</contrib-id><name-alternatives><name xml:lang="en"><surname>Marutyan</surname><given-names>Alexander S.</given-names></name><name xml:lang="ru"><surname>Марутян</surname><given-names>Александр Суренович</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor, teacher, leading researcher</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент, преподаватель, ведущий научный сотрудник</p></bio><email>al_marut@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Pyatigorsk Institute (branch) of the North Caucasus Federal University</institution></aff><aff><institution xml:lang="ru">Пятигорский институт (филиал) Северо-Кавказского федерального университета</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-07-20" publication-format="electronic"><day>20</day><month>07</month><year>2022</year></pub-date><volume>18</volume><issue>2</issue><issue-title xml:lang="en">VOL 18, NO2 (2022)</issue-title><issue-title xml:lang="ru">ТОМ 18, №2 (2022)</issue-title><fpage>111</fpage><lpage>139</lpage><history><date date-type="received" iso-8601-date="2022-07-20"><day>20</day><month>07</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Marutyan A.S.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Марутян А.С.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Marutyan A.S.</copyright-holder><copyright-holder xml:lang="ru">Марутян А.С.</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/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/31566">https://journals.rudn.ru/structural-mechanics/article/view/31566</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The article presents a continuation of the optimization of channel and I-shaped bended closed profiles (BCP) with tubular flanges and perforated walls made of rolled sheet products of both equal and different thicknesses. Such profiles are designed for light steel thin-walled structures (LSWS), which are distinguished by improved technical and economic indicators and mass demand in industrial and civil construction, which confirms the relevance of their further development. The purpose of the study is to show that the characteristics of LSWS can be further improved by shaping profiles, combining straight and round outlines of closed and open contours in a composite section, including their perforation. Through experimental design studies, solving optimization problems and variant design of the BCP, their design sections with a maximum margin of bending strength with a minimum mass have been refined. The originality of technical solutions is confirmed by patent examination. The channel BCP has extreme weight and strength with a relative height of cutouts in the wall of 1/1.87 and a ratio of width and height dimensions of 1/4.32. When the thickness of the shelves is 2 times the wall thickness, the strength and mass of the I-shaped BCP are extreme at a relative height of cutouts of 1/1.23 and a ratio of dimensions of 1/4.17, and when the thickness of the shelves is 0.6 of the wall thickness, the strength and mass of the BCP are extreme with a cutout height of 1/1.73 and a size ratio of 1/5.22. If the thicknesses of the shelves and the wall are equal, then the strength and mass of the BCP is extreme at a cutout height of 1/1.46 and a size ratio of 1/3.17.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">В представленном исследовании продолжается оптимизация швеллерных и двутавровых гнутозамкнутых профилей (ГЗП) с трубчатыми полками и перфорированными стенками из листового проката как равных, так и разных толщин. Такие профили предназначены для легких стальных тонкостенных конструкций (ЛСТК), отличающихся улучшенными технико-экономическими показателями и массовым спросом в промышленно-гражданском строительстве, что подтверждает актуальность их дальнейшей проработки. Цель исследования - показать, что характеристики ЛСТК можно дополнительно улучшить при помощи формообразования профилей, сочетающего в составном сечении прямые и круглые очертания замкнутых и открытых контуров, включая их перфорирование. Посредством опытно-конструкторских проработок, решения оптимизационных задач и вариантного проектирования ГЗП уточнены их расчетные сечения с максимальным запасом прочности на изгиб при минимальной массе. Оригинальность технических решений подтверждена патентной экспертизой. Швеллерный ГЗП обладает экстремальными массой и прочностью при относительной высоте вырезов в стенке 1/1,87 и отношении размеров ширины и высоты 1/4,32. Когда толщина полок в 2 раза больше толщины стенки, прочность и масса двутаврового ГЗП экстремальны при относительной высоте вырезов 1/1,23 и отношении размеров 1/4,17, а когда толщина полок составляет 0,6 толщины стенки, прочность и масса ГЗП экстремальны при высоте вырезов 1/1,73 и отношении размеров 1/5,22. Если толщины полок и стенки равны, то прочность и масса ГЗП экстремальна при высоте вырезов 1/1,46 и отношении размеров 1/3,17.</p></trans-abstract><kwd-group xml:lang="en"><kwd>rod structures</kwd><kwd>thin-walled structures</kwd><kwd>bent-closed profiles</kwd><kwd>perforated walls</kwd><kwd>toothed fasteners</kwd><kwd>optimization of cross sections</kwd><kwd>calculation of optimal parameters</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>стержневые конструкции</kwd><kwd>тонкостенные конструкции</kwd><kwd>гнутозамкнутые профили</kwd><kwd>перфорированные стенки</kwd><kwd>зубчатые крепления</kwd><kwd>оптимизация сечений</kwd><kwd>расчет оптимальных параметров</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">Perelmuter A.V. Constructive form number one. Proceeding of the Donbas National Academy of Civil Engineering and Architecture. 2012;(1):27–39. 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