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Strengthening of monolithic floor slabs of residential buildings that have wall design sustems УСИЛЕНИЕ МОНОЛИТНЫХ ПЛИТ ПЕРЕКРЫТИЙ ЖИЛЫХ ЗДАНИЙ СТЕНОВОЙ КОНСТРУКТИВНОЙ СИСТЕМЫ

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Author(s): Malakhova Anna Nikolaevna

Journal: Stroitel’stvo : Nauka i Obrazovanie
ISSN 2305-5502

Issue: 4;
Start page: 3;
Date: 2012;
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Keywords: monolithic floor slabs | residential buildings that have wall design systems | examination of the technical condition | redistribution of forces | trial loading | structural reinforcement solutions | монолитные плиты перекрытия | жилые здания | стеновая конструктивная система | обследование технического состояния | перераспределение усилий | пробное нагружение | конструктивные решения по усилению

ABSTRACT
The author proposes several structural solutions aimed at the reinforcement of monolithic floor slabs by means of fastening metal stripes onto the surface of slabs, laying supplementary reinforcement rods inside indents and attaching them by dowels. The author describes a force redistribution pattern identified in the course of analysis of monolithic floor slabs of buildings that have a wall design system. The author provides recommendations concerning the method of trial loading designated for the assessment of the true bearing capacity of floor slabs of residential buildings. The monolithic nature of reinforced slabs is attained by supplementary dowel connections. The dowel joint of old and new concrete elements takes the transverse shearing force in the event of bending to assure the monolithic behaviour of elements. Efficient behaviour of a monolithic slab is attained by means of a reliable connection between supplementary reinforcement rods and reinforcement rods inside slabs. Elements made of composite materials have been recently applied to strengthen reinforced concrete structures. These materials are basically composed of polymer tars and reinforcement materials (glass fiber, carbon and aramid fibers). Polymer sheets, stripes and fabric replace metal sheets, stripes and reinforcing meshes.Предложены конструктивные решения по усилению монолитных плит перекрытия: путем закрепления к поверхности плиты металлических полос и путем прокладки дополнительных арматурных стержней в штрабах со шпонками. Показано использование механизма перераспределения усилий при расчете монолитных плит перекрытия в зданиях стеновой конструктивной системы. Приведены рекомендации по обследованию монолитных плит перекрытия перед усилением, а также по применению пробного нагружения для оценки фактической несущей способности плит перекрытия жилых зданий
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