Abstract
The stability of structures mainly depends on the structural components like beams, columns and slab. Here in this study columns are reduced in the large open areas to access the whole room, which can be done by using the ribbed slab, grid slab and flat slab, which will help in minimizing the no. of columns which are required in the structure. A comparative study on seismic behaviour of G+6 school building is done with conventional slab and ribbed slab at seismic zone III and medium soil conditions by using SAP2000 software, it is found that in gravity analysis the maximum bending moments and shear force obtained for normal slab structure are 84.96 kN-m and 80.86 kN respectively, whereas for ribbed slab structure is 137.39 kN-m and 108.01 kN. The maximum storey stiffness of the ribbed slab structure is found to be 0.94 times of maximum storey stiffness of normal slab structure. It is found that the ribbed slab structure doesn’t perform well in moderate to high seismic areas. The stability of the ribbed slab structure can be enhanced by retrofitting the existing structure.
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