STUDY ON EFFECT OF COLUMN DIMENSION AND SLAB THICKNESS ON PUNCHING SHEAR STRESS IN FLAT PLATE STRUCTURES

Abstract

The construction of flat plate structures are becoming more popular as they exhibit several advantages over
conventional moment-resisting frames. Flat plate structures are a structural system in which the slabs are supported by
columns without the provision of beams. In such structures, high shear stress may be developed at the slab-column
junctions when subjected to earthquakes or other lateral loads. When this shear stress exceeds the limit, it can resulting
in punching shear failure. This paper aims to study the effect of different parameters on the punching shear stress
developed at the slab-column connections in flat plate structures. The parameters considered in this study are: column
dimension and slab thickness. Pushover analysis of a six-storied reinforced concrete flat plate structure is carried out for
different models with variation in parameters considered. The punching shear stress at the corner, edge and intermediate
slab-column connections in a flat plate structure is obtained. It is found that punching shear stress varies proportionally
with column depth while it is inversely proportional to slab thickness.