Using vertical ribs surrounds one or more sides of the soil mass beneath the raft foundation, considers` an alternative approach required for improving the bearing capacity of raft foundation. This study aims to investigate the geotechnical behavior of vertical ribs fixed to the raft foundation. Numerous numerical models were carried out using elastic plastic Finite Element program as (2D PLAXIS). The studied parameters include the raft width, shear strength of the sand below the raft, ribs depth, number of ribs and thickness of the raft. The results indicated that using vertical ribs that fixed to the raft foundation has a significant effect in improving the bearing capacity and reducing the settlement with the increase of ribs depth. It can be seen that the increase of number of ribs (N) with sufficient depth leads to considerable increase in the ultimate bearing capacity of raft. It is noticed that the improving in the ultimate bearing capacity in the form of BCR values are found to be increased by 220 and 350% for ribs number 2 and 3 respectively. The finite element analysis presented in this study helped in better understanding and identifying the failure pattern of using vertical ribs. It can be concluded that this improvement technique has a significant effect in modifying the bearing capacity failure form general shear failure to punching failure with lesser settlement.