Аннотації

Автор(и):
Барабаш М.С., Ромашкіна М.А., Башинська О.Ю.
Автор(и) (англ)
Barabash М., Romashkina M., Bashynska O.
Дата публікації:

29.12.2019

Анотація (укр):

Представлено розрахунок залізобетонної плити перекриття на вогневий вплив із урахуванням впливу термоползучесті бетону. Розрахунок виконано в два етапи. На першому етапі вирішується задача нестаціонарної теплопровідності для визначення температурного поля по перерізу плити. На другому етапі виконано розрахунок на міцність з урахуванням жорсткісних і деформаційних характеристик бетону та арматури, а також із урахуванням впливу повзучості.

Анотація (рус):

Представлен расчет железобетонной плиты перекрытия на огневое воздействие с учётом влияния термоползучести бетона. Расчет произведен в два этапа. На первом этапе решается задача нестационарной теплопроводности для определения температурных полей сечения плиты. На втором этапе происходит прочностной расчет с учетом понижения жесткостных и деформационных характеристик бетона и арматуры, и учетом влияния ползучести.

Анотація (англ):

The article provides research of the stress-strain state of a reinforced concrete floor slab under fire conditions according to refined method. The finite element model of the slab is created. At the first stage of the research, one solved the unsteady heat conduction problem. According to the solution of the problem, it is possible to obtain the temperature fields all over the section of the considered structural element at certain intervals of time. The second stage of the study is strength analysis. Due to the strength evaluation, it is possible to investigate the work of the floor slab at different time points of fire exposure. Several mathematical models are considered. These models correspond to different points in time of fire impact. In each design model of the floor slab, the strength and deformation characteristics of concrete and reinforcement were deepen in accordance with the section temperature. It made three types of fire resistance analysis of the structure: linear analysis, physically-nonlinear analysis, and physically-nonlinear analysis with taking into account the effect of creep. The results of comparison of the kinetic performance of the mathematical models in various problem statements are showed. The technique, which allows to take into account the influence of creep in the numerical simulation of fire effect is proposed.

Література:

References:

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