This study investigates the effect of the depth of the slot on the behavior of double-slotted RC beam (DSB) systems under monotonic loading by utilizing finite element analysis. Firstly, 3D nonlinear finite element analyses of three experimentally tested specimens in literature were performed in order to examine the ability of the numerical model to predict the experimental behaviour. In the second part of the research, this verified numerical model was used to investigate the effect of the depth of the slot on the beam behavior by changing the slot depth. The slot depth / beam height ratio was assumed to be 0.125, 0.150, 0.200, 0.300 and 0.400 in the parametric study. None of the geometrical properties and reinforcement details were modified in these analyses as the control variable was the depth of the slot. During analyses, the vertical load effect on the column and the monotonic displacement at the end of the cantilever beam were taken into account. In addition, nonlinear material properties of concrete as well as reinforcing steel were considered. The performance of models were classified by comparing the load, displacement and rotation capacities of DSB systems. As a result, it was observed that the slot depth / beam height ratio of 0,300 performed better for each plastic hinge location.