The construction industry is growing very fast across the globe as such the demand for the space is increasing day by day. It is often in metropolitan cities that buildings are build very close to each other due to lack of space and this leads to phenomenon called “Pounding”. The pounding means a collision of adjacent building to each other due to insufficient space between the buildings. The pounding is a dynamic property and depends on many factors.In this papereffect of GAP between the building on pounding force is studied in detailed. The modeling and analysis of building is done by using ETABS analysis package. The gaps between the buildings are modeled by using compression only “GAP” element which consists of specified gap and a spring with proper stiffness. The nonlinear modal time history analysis is performed for three different ground motion characteristics and parameters such as displacement, pounding force and base shear etc are compared and presented.