РАСЧЕТ ЖЕЛЕЗОБЕТОННЫХ КЕССОННЫХ ПЕРЕКРЫТИЙ
CALCULATION OF REINFORCED CONCRETE CASSON FLOORS
Сторінки: 207-211. Номер: №2, 2019 (271)
Автори:
Е. А. ЯРЕМЕНКО
Одесская государственная академия строительства и архитектуры
Н. А. ЯРЕМЕНКО
Одесский национальный морской університет
H. A. YAREMENKO
Odessa State Academy of Construction and Architecture
N. A. YAREMENKO
Odessa National Maritime University
DOI: https://www.doi.org/10.31891/2307-5732-2019-271-2-207-211
Рецензія/Peer review : 05.02.2019 р.
Надрукована/Printed : 10.04.2019 р.
Анотація мовою оригіналу
Одними из наиболее распространенных элементов различных зданий и сооружений являются плоские железобетонные перекрытия. В современном строительстве применяют в основном сборные и сборно-монолитные перекрытия. Они отличаются высокой индустриальностью. В работе представлен результат расчета кессонного перекрытия с ребрами, которые расположены в двух направлениях. При расчете учитывается физическая нелинейность. Характеристики исследуемой модели даны в статье. Расчет перекрытия произведен при помощи компьютерной программы, которая численно реализует задачи расчета железобетонных ростверков на основе пространственной расчетной схемы с учетом физической нелинейности. На основе полученных результатов проанализировано напряженно-деформированное состояние железобетонного кессонного перекрытия в упругой стадии работы и при наличии трещин.
Ключевые слова: перекрытие, кессон, предварительное напряжение, балочный ростверк, перекрестная система.
Розширена анотація англійською мовою
One of the most common elements of various buildings and structures are flat reinforced concrete floors. In modern construction mainly used prefabricated and precast-monolithic floors. They are highly industrialized. Considered in the work of the system of cross beams, made of reinforced concrete, are flat ribbed, coffered floor. One of the current trends is the assessment of the stress – strain state and the carrying capacity of the cross beams and their systems. The aim of the work is to use a software package created for the implementation of the calculation and, as a consequence, the study of the stress-strain state of the systems of cross beams made of reinforced concrete. The paper presents the result of the calculation of the caisson overlap with the ribs, which are located in two directions. The calculation takes into account the physical nonlinearity of the material. The ribs are located in two directions. Thus, free architectural planning becomes possible, which in turn makes it possible to use the structure for various planning decisions. Characteristics and drawing of the studied model are given in the article. The overlap was calculated using a computer program that numerically implements the tasks of calculating reinforced concrete grillages on the basis of a spatial design scheme taking into account physical nonlinearity. On the basis of the obtained results, the stress – strain state of reinforced concrete decompression in the elastic stage of work and in the presence of cracks is analysed. In the vicinity of middle columns, there is an increase in bending moments and shear forces. Their magnitude is greater than the magnitude of the corresponding efforts in a continuous beam imitating the columnar overlap. The formation of cracks leads to an increase in deflections, a decrease in transverse forces and bending moments in the model under study. In the strip above the column, in the longitudinal row of columns, the forces fall much less than in the cross-section bands of the overlap.
Keywords: overlap, caisson, prestressing, beam grillage, cross system.
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