A Research for high strength and better performance characterstics of floor and roof systems are designed to carry gravity loads and transfer these loads to supporting beams, columns or walls. furthermore, they play a key role in distributing earthquake-induced loads to the lateral load resisting systems by diaphragm action. when building structures are subjected to dynamic loadings, the induced inertial forces are transmitted through floor slabs and resisted by vertical structural components

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... ch as shear walls and frames. in this situation, the floor slabs function as diaphragms placed between the vertical components. in analysis and design of three dimensional structures under seismic loading, the diaphragms are frequently assumed to be perfectly rigid. in certain type of structures, however, this assumption is found to create significant discrepancy on the lateral load distribution.this discrepancy frequently occurs in frame-wall structures, in which the vertical components consist of shear walls with high storey stiffness and relatively flexible frames. therefore, in the present work analytical parametric studies are done on high rise structures with simple frame and plate frame structures.