One of the main goals of the recently developed composite systems is the reduction of floor height and preventing shear connectors and forming aesthetically appealing level floor system as similar as RC flat slab floor system. This research proposes a shallow floor depth composite beam which consists of deep deck concrete slab & profile sheeting; and web perforated steel beam. The study of research basically focused on numerical modeling and investigation of horizontal shear (interface slip) behaviour of SF composite beam. Accordingly, 3D FE modeling using Abaqus/CAE software was utilized on a comprehensive parametric study to investigate the influences of interface shear behavior of SF floor depth composite beams. To address this issue, nine FE models under different types of openings; trapezoidal, square, and circular web openings at bottom, middle and staggered position of the web post of steel beam were investigated. One reference FE model without web openings was also investigated. Spacing, number, geometrical areas of web openings and span length of the composite beam were basic controlling parameters throughout the study. Load versus interface slip curves were plotted for interface slip between the slab deck & steel beam and bottom steel tubular flange & infill concrete. Hence, SF depth composite beam without web opening exhibited less ductility against load versus slip capacity as compared with other nine web perforated composite beams. In addition, shallow floor composite beam with circular perforated web post steel beam exhibited 7.5 % ultimate load capacity increment with better ductility than composite beams with other web openings and locations. As a result, circular web openings located at the middle of the web post exhibits higher failure load versus interface slip capacity. But the experimental model utilizes trapezoidal web opening located at the bottom web post of steel beam. Hence, the proposed FE containing circular web openings at the middle of the web post can have better failure load capacity to interface slip as compared to initial experimental model. Therefore, from this investigation it was found that web perforated SF composite beams had better performances than the reference composite beam without web openings and the results of the numerical investigation also indicated that web openings can be used successfully as the interface shear connecting mechanisms in shallow floor composite beams.