Modeling of systems and processes Modeling of systems and processes Моделирование систем и процессов 2219-0767 84632 10.12737/2219-0767-2024-17-2-50-61 Технические науки Технические науки Modeling the occurrence of internal stresses in a complex material structure Моделирование возникновения внутренних напряжений в сложной структуре материала Николенко Сергей Дмитриевич Nikolenko S. D. Козодаев Сергей Петрович Kozodaev S. P. kozodaev.s@mail.ru

кандидат технических наук;

candidate of technical sciences;

 Сазонова Светлана Анатольевна Sazonova Svetlana Anatol'evna Воронежский государственный технический университет Voronezh State Technical University Военный учебно-научный центр Военно-воздушных сил, Военно-воздушная академия имени профессора Н.Е. Жуковского и Ю.А. Гагарина Россия Military Educational and Scientific Centre of the Air Force N.E. Zhukovsky and Y.A. Gagarin Air Force Academy Russian Federation 28 06 2024 28 06 2024 17 2 50 61 16 03 2024 03 06 2024 https://zh-szf.ru/en/nauka/article/84632/view

Статья посвящена решению задачи, направленной на улучшение эксплуатационных характеристик мостового полотна железнодорожного моста за счет применения дисперсного армирования. Отмечено, что элементы конструкций из фибробетона с ростом нагрузки ведут себя аналогично железобетонным: задолго до разрушения они испытывают нарушение сплошности. Рассмотрен вопрос о распределении усилий между отдельными фибрами, пресекающими трещину, изменение этих условий в ходе разрушения, величинах и направлениях этих усилий в момент, предшествующий разрушению. Исследован центрально-растянутый элемент конструкции, хаотически армированный фибрами с нарушением сплошности в виде сквозной трещины, перпендикулярно расположенной к растягивающим напряжениям. Предложенные зависимости позволяют оценить распределение усилий между отдельными фибрами, пересекающими трещину, и деформации элемента, связанные с раскрытием последней, что важно для создания единой методики расчета прочности и определения деформаций фибробетонных конструкций. Рассматривается целесообразность применение дисперсного (фибрового) армирования в безбалластной железобетонной плите. Выполнена постановка задачи и описание фибрового армирования. Предметную область предлагается обосновать экспериментально с помощью исследования фибробетона на ударную нагрузку и конструкций с дисперсным армированием на знакопеременную инерционную нагрузку. Проведенные экспериментальные исследования показали возможность применение дисперсного (фибрового) армирования в безбалластной железобетонной плите.

The article is devoted to solving the problem aimed at improving the operational characteristics of the bridge bed of a railway bridge through the use of dispersed reinforcement. It is noted that structural elements made of fibroconcrete behave similarly to reinforced concrete with increasing load: long before destruction, they experience a continuity violation. The question of the distribution of forces between the individual fibers that stop the crack, the change in these conditions during the destruction, the magnitude and directions of these efforts at the moment preceding the destruction is considered. A centrally stretched structural element chaotically reinforced with fibers with a violation of continuity in the form of a through crack perpendicular to the tensile stresses is investigated. The proposed dependencies allow us to estimate the distribution of forces between individual fibers crossing the crack and the deformations of the element associated with the opening of the latter, which is important for creating a unified methodology for calculating strength and determining deformations of fiber-reinforced concrete structures. The expediency of using dispersed (fiber) reinforcement in a ballast-free reinforced concrete slab is considered. The task statement and description of fiber reinforcement are completed. The subject area is proposed to be justified experimentally by studying fiber reinforced concrete for impact load and structures with dispersed reinforcement for alternating inertial load. The conducted experimental studies have shown the possibility of using dispersed (fiber) reinforcement in a ballast-free reinforced concrete slab.

 Моделирование распределении усилий между отдельными фибрами дисперсное армирование конструкций железобетон фибробетон мостовое полотно железнодорожного моста динамические нагрузки. Modeling distribution of forces between individual fibers dispersed reinforcement of structures reinforced concrete fiber concrete bridge bed of a railway bridge dynamic loads.

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