In this study, comparative structural analyzes of three-dimensional (3-D) G + 20 high-rise with and without rigid floor aperture are considered. The three different construction plans are considered hexagonal, pentagonal and square. The buildings are also considered with different height levels that are 5 floors, 10 floors, 15 floors and 20 floors. The building is analyzed for four different ones Indian seismic zones (zone II, III, IV and V) according to IS 1893-2002. A total of 96 buildings

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... analyzed with 27 load combinations. The buildings are critically analyzed to quantify the effects of different parameters for maximum axial forces, the bending moment and the shear force in beams, seismic forces, wind forces and displacements of the floor. The results show that the use of a stiff diaphragm is more efficient in reducing above parameters in buildings for lateral forces. Rigid membrane concept is reasonable to build square in plan instead of pentagonal or hexagonal building plan.