Ефективні рішення покрить підземних будівель з тонкостінних монолітних залізобетонних оболонок для умов Близького Сходу

Разработаны методические рекомендации по проектированию и экономической оценке покрытий-оболочек подземных зданий для условий Ближнего Востока. Результаты исследования внедрены в проектирование и строительство объектов в Украине и Сирии.

Ключевые слова: подземные железобетонные конструкции, купола и оболочки переноса, климатические воздействия, температурно-усадочные напряжения и усилия, физическая и геометрическая нелинейность, ползучесть, трещиностойкость, экономическая оценка.

ABSTRACT

Bassil Mareei Mohamad. The effective solutions of coatings for the underground buildings from thin-wall monolithic ferroconcrete shells for the Middle East conditions.

A thesis on competition of a technical scientific degree on specialty 05.23.01- building constructions, building and structures.

Kharkov State technical university of building and architecture, Kharkov, 2003.

The manuscript containing the technique of creating the effective coating construction of monolithic underground ferroconcrete building for climatic conditions of the Middle East is presented.

The calculation technique of the gentle domes of the underground buildings with allowance for temperature-moisture effects and actual work of the materials was worked out.

Temperature-moisture operational modes of the building structures in the subtropical belt according to the data of the regional classification of the climatic zones, were defined more precisely. Computative dependence of an annual course of the main environment parameters (potentiality of humidity and temperature) was given. The restriction conditions of the problems of the heat-moisture conductivity were formulated.

Distribution of the humidity potential according to the thickness of the shells at a unilateral drying was calculated.

The definition technique of the pressure from shrinkage and swelling by introducing the equivalent temperatures was offered. The evaluation of the level influence of the climatic conditions on the stressed-strained shell state by numerical researches of the shrinkage stresses by the finite elements method with the usage of a program complex Lira Windows was carried out. Calculation technique of the domes, which allows to account the physical nonlinearity of the reinforced concrete - cracking and creeping was developed.

The calculation technique of the underground buildings with flat rectangular outline was developed. The finite-differential model of the gentle bicurved shell was worked out. The algorithm and program SHELL for the PC, were made up. The numerical researches of temperature-shrinkage stresses in ferroconcrete shells on the rectangular plan by using program complex SCAD for Windows were carried out.

It is clarified, that the shell of removing during the process of humidity changing down to full drying goes through stages with higher level of stressed-strained state, than the final one. Great role of the border element was found out. The most stressed zones of the shells, which enables to reinforce rationally, were defined. The account of geometrical nonlinearity increases the efforts and displacement almost twice.

"The “upper" border load for different schemes of coating shell arrangement relatively to a daylight earth surface and also overall-constructive dimensions and the conditions on the outline, were determined.

The optimal constructive solutions of the underground buildings coatings-shells were determined. The analysis and classification were made. A modular line of the coatings-shells structures used in the underground space was formed.

The systematic guidelines for designing and economic estimation of the underground buildings coating-shells for the Middle East conditions were developed. The results of researches were inserted in designing and building of the objects in Ukraine and Syria.

Keywords: underground ferroconcrete constructions, domes and shells of displacement, climatic effects, temperature-shrinkage stresses and efforts, physical and geometrical nonlinearity, creeping, cracking resistance, economic estimation.

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