This study presents the seismic performance evaluation of post-tensioned (PT) flat slab buildings using ETABS and SAFE software under different seismic conditions. A total of 40 models were analyzed by varying building height, slab span, seismic zone, and soil type. The study considered G+4, G+7, and G+9 buildings with 6 m and 8 m slab spans located in Seismic Zones II, III, IV, and V as per IS 1893 provisions. Important structural parameters such as storey displacement, storey drift, punching shear, and slab deformation were evaluated to understand the behavior of PT flat slab systems under earthquake loading. The results showed that displacement, drift, and punching shear values increased significantly with increase in seismic intensity and building height. Models in Zone V produced the maximum seismic response, while Zone II models showed the minimum response. Larger slab spans also resulted in higher deformation and reduced lateral stiffness. The SAFE analysis indicated that slab thickness must be increased in higher seismic zones to satisfy punching shear requirements. The study concludes that PT flat slab systems are structurally efficient, economical, and suitable for multi-storey buildings; however, additional lateral load resisting systems such as shear walls or bracing are recommended for high-rise buildings in severe seismic zones to improve overall stability and safety.
Shrivastav et al. (Fri,) studied this question.