ACCORDING TO THE CALCULATION OF REINFORCED CONCRETE CEILINGS TAKING INTO ACCOUNT THE CHANGE IN TORSIONAL STIFFNESS OF PREFABRICATED PLATES AGAINST THE FORMATION OF NORMAL CRACKS

Abstract

The article shows the influence of torsional rigidity of reinforced concrete elements on the spatial work of bridges, overlappings, building frames and other complex statically indeterminate systems. It is shown that the determination of torsional stiffnesses by the existing methods assumes the obligatory presence of spatial spiral cracks, and torsional stiffness in the presence of normal cracks is not investigated. A method for determining the torsional rigidity of reinforced concrete elements is described in the presence of normal cracks in them. It is shown that this approach allows calculating the torsion of reinforced concrete elements of any cross-section, and also taking into account the nonlinear properties of concrete. The article also describes the use of approximation methods, in particular, the apparatus of the best Chebyshev approximation.