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1 2009

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Konstrujuvannja ih doslihdzhennja monolihtnikh ploskikh zalihzobetonnikh perekrittihv z efektivnimi vstavkami

Mel'nik I. V., Sorokhtejj V. M.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2009

z. 55 [267]

27-36

In last years all wider monolithic flat reinforced-concrete slabs, especially in building engineering (habitation, offices and others) are used. There is also a tendency to the increase of such slabs and use them in commercial and exhibition complexes. The flights of the monolithic slabs are 6 to 9 m, and limited by thickness 20 to 30 cm. Checking the static calculations show the limit, by the general conditions of deformation and crack resistance. Own weight of such slabs is considerable and 2 to 3 times exceeds an actual useful load. With the purpose of diminishing own weight of flat monolithic reinforced-concrete slabs it is expedient to put in them effective insertions from relation to easy and cheap materials, dispose in middle part a cut and abandon in slab after his concreting. In the search of materials for such insertions were performed tests on the fragments of slabs from pipes by hollow and continuous expanded polystyrene insertions. Results of which are given in previous publications. The results of these researches were taken into account at design and making of a few flat monolithic slabs with the effective insertions of different sizes, forms and charts: rectangular sizes in the plan of 7,6 x 12,1m in the Lviv area, Ukraine (diminishing of own weight of slab 32%); round the radius of 9,1M with intermediate radial metallic beams in M. Lviv (diminishing of own weight of slab 47%); rectangular uncut sizes in the plan of 12 x 24 m with intermediate metallic beams with the step of 6M in the Zakarpatskiy area, Ukraine (diminishing of own weight of slab 49%); collapsible-monolithic sizes in the plan of 12 x 24 m in the Zakarpatskiy area, Ukraine (diminishing of own weight of slab 52%). Test of fragments of the flat monolithic slabs and model slab sizes to 7,6 x 12,1 static the features of the tensely deformed state of different type found out loading in cuts with insertions, that it is necessary to take into account at checking calculations and constructing of such ceilings. General static chart of work of slab, form and sizes of insertions it can be simple and difficult uni- and the biaxial tensely deformed state, entailed to combination of general and local (in cuts with insertions) power factors. Monolithic reinforced-concrete slabs with effective insertions are very useful in buildings on seismically active territories. They have substantially (to 35 ... 50%) diminished dead weight and at the same time keep the continuous disk of slab as whole.