Suryanita, Rcni2012-11-072012-11-072012-11-079789797921355https://repository.unri.ac.id/xmlui/handle/123456789/388Ground excitation on two buildings can cause pounding if the gap between them is not enough for their free vibration response. Pounding can cause amplification of internal forces of the response structure elements and impact force at the contact zone that usually have not calculated yet in the preliminary design. Therefore, it can cause damage and failure of the building. The two buildings are modeled as MDOF discrete. To release the bounding between the degree of freedom, the dynamic analysis is carried out by modal superposition method, then the analysis is continued by numerical analysis by Runge Kutta method. The parameters of study are mass of the model, stiffness of the model, pounding stiffness, and the initial gap between the buildings. The result of study, shows that the pounding force will increase as the initial gap between the buildings is decrease. Minimum gap between the buildings to avoid pounding is less than the relative maximum of total absolute value range of the both buildings under designed earthquake force. Therefore, by knowing minimum gap between buildings so the pounding can be avoidedenDegree of freedomMDOF discrmodal anaRunge-ungeKutta, pounding force, structural respongapArticle