Электронный каталог НБ БНТУ

Книга (аналит. описание)

Determination of critical stress fiber intensity factor of concrete by tearing off with a splitting / A. Sadouskaya [et al.] // Проблемы современного строительства: материалы Международной научно-технической конференции, Минск, 28 мая 2019 г. / [редколлегия: В. Ф. Зверев, С. М. Коледа]. – Минск: БНТУ, 2019. – P. 336-341. – Режим доступа : http://rep.bntu.by/handle/data/60628. - Пер. загл.: [Определение критического коэффициента интенсивности напряжений волокна бетона]. – На англ. яз.

There are no particular obstacles for crack propagation in high-strength concrete. However, in the dispersion-reinforced concrete obstacles in the form of fibers hamper the spread of the crack. It is clearm that under the action of the load, the development of a crack is inevitable, but additional energy is expended on overcoming each obstacle in the form of a fiber, so the process of cracking can gradually fade. Thus, the fibers in the concrete are crack inhibitors. Crack resistance is a local physico-mechanical property of a solid that characterizes the ability to resist the propagation of cracks in it. Fiber concrete is a building material for which a distinctive feature is the improvement of crack resistance characteristics. The determination of the stress intensity factor makes it possible to correctly assess the resistance of the material during the formation and development of cracks. The stress intensity factor is one of the most important indicators of the crack resistance of a material such as fiber-reinforced concrete. For this reason, the methods and methods for determining this indicator should most fully disclose all the features of work under load and the quality of fiber-reinforced concrete. To determine the stress intensity factor in the laboratory, you can use the technique of Leonovich S.N., Piradov K.A., Guzeev E.A. The essence of the method consists in determining the maximum loads destroying control specimens in compression and calculating the critical values of the stress intensity. For the authors, the task was to find a way to determine the stress intensity factor in already existing fiber-reinforced concrete structures.This article describes a method for determining the critical stress intensity factor of structural steel fiber concrete with normal separation. On the surface of the structure, a stress concentration zone is carried out, which is loaded through an anchor installed in a hole drilled in a fiberreinforced concrete before the microvolume is pulled out. The data obtained determine the critical stress intensity factor. In addition to the pull-out force, geometrical measurements of the truncated cone of fracture of the structural steel fiber-reinforced concrete are made. In the established relationship between them, determine the critical stress intensity factor KIC of steel fiber concrete with normal separation.

691.32:620

общий = БД Труды научных работников БНТУ : 2019г.
труды сотрудников БНТУ = Строительный факультет
труды сотрудников БНТУ = Научно-исследовательский политехнический институт (НИПИ) : НИЛ промышленного и гражданского строительства
общий = БЕТОН
общий = ИСПЫТАНИЯ