Structural Mechanics of Engineering Constructions and BuildingsStructural Mechanics of Engineering Constructions and BuildingsСтроительная механика инженерных конструкций и сооружений1815-52352587-8700Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)3441910.22363/1815-5235-2023-19-1-17-34FMMJZMAnalysis and design of building structuresРасчет и проектирование строительных конструкцийResearch ArticleModal analysis of a large-span building with different boundary conditionsМодальный анализ большепролетного здания с разными граничными условиямиhttps://orcid.org/0000-0002-0907-786X1949-1140KuzhakhmetovaElvira R.КужахметоваЭльвира Рафаэльевна

engineer, senior lecturer, Reinforced Concrete Structures and Masonry Structures Department, Institute of Industrial and Civil Engineering

инженер, старший преподаватель, кафедра железобетонных и каменных конструкций, Институт промышленного и гражданского строительства

elja_09@bk.ruhttps://orcid.org/0000-0002-4911-85157194-7481SutyrinValerii I.СутыринВалерий Игоревич

Doctor of Technical Sciences, Professor, Head of the Institute of Engineering and Technology

доктор технических наук, профессор, Институт высоких технологий

vsutyrin@mail.ruMoscow State University of Civil Engineering (National Research University)Национальный исследовательский Московский государственный строительный университетImmanuel Kant Baltic Federal UniversityБалтийский федеральный университет имени Иммануила Канта30032023191VOL 19, NO1 (2023)ТОМ 19, №1 (2023)173415042023Copyright ©; 2023, Kuzhakhmetova E.R., Sutyrin V.I.Copyright ©; 2023, Кужахметова Э.Р., Сутырин В.И.2023Kuzhakhmetova E.R., Sutyrin V.I.Кужахметова Э.Р., Сутырин В.И.https://creativecommons.org/licenses/by-nc/4.0https://journals.rudn.ru/structural-mechanics/article/view/34419

The authors present the results of a modal analysis of finite element models of a large-span building with a cylindrical-and-slab roof as a large mechanical system. During the numerical study, the following spatial models are considered: 1) superstructure - fixed-end; 2) superstructure - pile foundation - soil base. The purpose of the study is to compare the results of a modal analysis of the design of a large-span building with different boundary conditions, physical and mechanical properties of the soil base. Modal analysis of a large-span building with a cylindrical-and-slab roof was carried out using the Femap NX Nastran CAE-class software package implementing the finite element method. The authors compare the frequencies and modes of natural oscillations of the construction of spatial models obtained on models of types 1 and 2 of the large-span building with a cylindrical-and-slab roof. As a result of the modal analysis of model 2, the influence of the physical and mechanical properties of the soil base on the characteristics of the structure's own oscillation was revealed. In the prospect, it is proposed to conduct a dynamic analysis of a large-span building with a cylindrical-and-slab roof for seismic effects.

Представлены результаты модального анализа конечно-элементных моделей большепролетного здания с цилиндро-плитным покрытием как большой механической системы. Рассмотрены следующие пространственные модели: 1) здание с жесткой заделкой опорных колонн на поверхности грунта; 2) здание - свайный фундамент - грунтовое основание. Цель исследования - выполнить сравнительную оценку результатов модального анализа конструкции большепролетного здания с разными граничными условиями и физико-механическими свойствами грунтового основания. Модальный анализ большепролетного здания с цилиндро-плитным покрытием проводился с применением программного комплекса САЕ-класса Femap NX Nastran, реализующего метод конечных элементов. Сопоставлены частоты и формы собственных колебаний конструкции пространственных моделей, полученные на моделях типа 1 и 2 конструкции здания с большепролетным цилиндро-плитным покрытием. Модальный анализ модели 2 показал влияние физико-механических свойств грунтового основания на характеристики собственной вибрации конструкции. В перспективе предполагается провести динамический анализ большепролетного здания с цилиндро-плитным покрытием на сейсмическое воздействие.

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