PARAMETRIC STUDY ON FLAT SLAB WITH AND WITHOUT COLUMN DROP

Structure engineering

In recent era, RCC flat slabs are preferred higher in many country of the world due to their aesthetic appearance as well as economic advantages. However, the punching shear failure at the slab column connection is the major disadvantages of the flat slab. If the punching shear is critical, either the slab thickness may be increase or column drop to be provide or shear reinforcement to be provide. Even though the concrete in the flat slab will provide a certain level of shear resistance around the column, remaining stresses it has to be provided punching shear reinforcement. In this paper, the flat slab with three different size of slab panel (6.5m x 6.5m, 8.5m x 8.5m, 10.5m x 10.5m) with different size of column (500mm x 500mm, 650mm x 650mm, 800mm x 800mm respectively) and three individual size of shear wall (2000mm x 300mm, 2500mm x 300mm, 3000mm x 300mm respectively) with M25 and M30 grade of concrete with and without column drop and analyze by SAFE (Slab Analysis by the Finite Element Method) as per IS-456 of the permissible punching shear criteria and compare the thickness based on stresses. This paper provides guidelines for thickness selection at preliminary stage to the designer for flat slab as well as flat plates.

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