EXPERIMENTAL STUDIES OF THE BEARING CAPACITY OF MODEL REINFORCED CONCRETE EMPTY FLOOR SLABS

Abstract

The results of laboratory tests of the model design of a hollow core slab are presented. In relation to the serial plate, the geometric dimensions of the model are halved, but, based on technological considerations, the plate has not 6, but 5 voids. The results obtained are compared with the results of computer modeling and calculation in SOFiSTiK and LIRA-SAPR software systems. The results of the finite element calculation in two different software systems differ slightly from the experimental data only before crack formation began. The bending moment from the load corresponding to the beginning of cracking in the experiment differs by 1,36% from the value obtained by computer calculation, and the deflection by 5,9%. And with the actual breaking load obtained in the experiment, the bending moment exceeds the similar value determined numerically by 3, 15 times, and the deflection by 5,2 times. This indicates that the linear model embedded in computer calculations is completely unacceptable after the onset of crack formation. The cracking process of the experimental plate sample began at a load of 16,6kN, which amounted to 59% of the actual breaking load.