Numerical study of multi-cavity overlap panels of various length

It is known that multi-cavity panels are represented in the form of I-beams (t-beams) for simplification of calculations and are calculated according to the beam theory. However, this representation can still distort the results of calculations. The purpose of this work is to study how the cross section of multi-cavity panels is represented for the samples of different length, determining the effect of the above factors on the load-bearing and deformative capacity, as well as the load of cracking. We have considered the samples of panels of various length, freely supported and working on a bend, with a cross section in a natural form, in comparison with samples of similar length in an I-beam form. The load has been applied sequentially to the samples in increments of 1 kN, until the yield point of the reinforcement in the stretched zone has been reached. A numerical study of multi-cavity panels in a nonlinear setting, with the formation of a plastic hinge in the middle of the span, has been performed. Load-deflection graphs have been obtained for modeling of the corresponding length of the samples with a natural and I-beam cross-section. The results have been obtained and compared for the load of cracks and deflections in the middle of the span under a destructive load. It has been discovered that the panel length affects the results of calculations of the forms under consideration, and the shorter the length, the more pronounced the deviation in the load-deflection graphs. As the length of the samples increases, the correlation coefficient increases and tends to one, what indicates to an increase in the relationship between the load-deflection graphs. The correction coefficients have been proposed to clarify the calculations of plates for the formation of cracks, deformations and destructive loads.