The aim of this paper is to study the effect of collisions between the adjacent structures during the earthquake and its effect on the behavior of the structure. The collisions could lead to local damage or even total collapse of colliding structures.
A model was performed on the ETABS program to model the pounding between the adjacent structures by using Gap element. The study was applied on a different height and a gap distance between the adjacent structures in order to understand and explain the effect of collision on the behavior of the structure and to clarify the danger of its occurrence. The results of the studied cases in case of pounding were compared with the normal case without pounding, where the Displacement, inter storey drift, impact force and max storey shear force were discussed. These results showed that both buildings were affected by the collision .Therefore, precautions should be taken to prevent the collision by having sufficient distance or design a system that can withstand the force resulting from these shocks.