DETERMINATION OF THE STRIPPING STRENGTH OF MONOLITHIC SLABS AND BEAMS

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Abstract


Checking the strength of concrete monolithic structures in the stage of erection is a necessary condition for the possibility of further normal operation of buildings and structures. The purpose of the work is to specify the timing of the decoupling of slabs and beams taking into account the real strength set. In this article, an engineering method for determining the form-fitting strength of concrete of monolithic bending elements without a prestressing reinforcement is considered. The method for determining the form-fitting strength is based on the equality of external and internal forces in the normal design section in the stage of failure when the strength of concrete is depleted. This method is applicable to linear elements and constructions. Based on the results of the work, a formula has been obtained for assigning the minimum concrete strength at decompression and the coefficient k , which can be used to easily and accurately determine the stripping strength for slabs and beams. The graphs of the dependence of the coefficient k are given for determining the formwork strength when using working reinforcements A400 and A500C, on the thickness of the plate under the action of a single moment. The proposed method for determining the form-fitting strength makes it possible to designate the size of the form-fitting strength for slabs and beams and to specify the timing of the decoupling of structures, taking into account the actual strength set.


About the authors

Vitaliy S Kuznetsov

Moscow State University of Civil Engineering (National Research University) (MGSU)

Author for correspondence.
Email: vitaly.ggh2014@yandex.ru
26 Yaroslavskoye Shosse, Moscow, 129337, Russian Federation

Сandidate of Technical Sciences, Associate Professor of the Department of Architectural and Construction Design (TSA), Moscow State University of Civil Engineering (National Research University). Research interests: monolithic and prefabricated structures with the use of high-strength fittings with clutch and without adhesion to concrete in the modern construction of buildings and structures

Yulia A Shaposhnikova

Moscow State University of Civil Engineering (National Research University) (MGSU)

Email: yuliatalyzova@yandex.ru
26 Yaroslavskoye Shosse, Moscow, 129337, Russian Federation

Сandidate of Technical Sciences, Associate Professor of the Department of Reinforced Concrete and Stone Structures (ZHBK), Moscow State University of Civil Engineering (National Research University). Research interests: monolithic construction, prestressed constructions without adhesion and with adhesion to concrete, modern building structures, inspection of technical condition and strengthening of building structures

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Copyright (c) 2018 Kuznetsov V.S., Shaposhnikova Y.A.

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