RESEARCH OF WORK OF STEEL FIBER CONCRETE GUTTERS UNDER SINGLE LOADS USING THE LIRA SOFTWARE COMPLEX

Abstract

to determine the numerical values of stresses, bending moments and displacements that occur in the trays of reinforced concrete under the action of pre-known loads on them. Physically nonlinear finite volume elements № 236 were used during the simulation of the work of experimental trays made of reinforced concrete. After modeling the tray element in the form of a half-pipe and breaking it down into finite elements, the mechanical characteristics corresponding to the real properties of the materials from which it is made using the phenomenon of physical nonlinearity are set. Using a PC "Lira" was modeled and calculated tray semi-pipe made of reinforced concrete with parameters corresponding to the samples type 1SFB-1… 3.

The values of the moments in the middle of the section obtained as a result of this calculation are given in table. 1. For comparison, also in table. 1 shows the values of bending moments and stresses in the half-pipe tray, which were determined theoretically. According to table. 1 the error of the values of bending moments and stresses obtained with the help of PC "Lira" and the theoretical calculation is mainly within 8… 13% with the arithmetic mean error X̅ = 10.56 and the standard deviation s = 3.96. The value of the coefficient of variation ʋ = 37%.

PC "Lira" makes it possible to determine the numerical values of bending moments and stresses arising in the trays of semi-tubes of reinforced concrete from the action of pre-known loads on them. After calculating the load-bearing capacity of the cross section of the semi-pipe tray made of reinforced concrete, we obtain the values of the limit moments at which these elements can be operated from reinforced concrete. Comparing these values, it is possible to determine the limit operating conditions for these trays in the form of a semi-pipe made of reinforced concrete.