FINITE ELEMENT ANALYSIS OF CONVENTIONAL REINFORCED CONCRETE AND STEEL FIBRE REINFORCED CONCRETE IN SLAB-COLUMN JOINT

Abstract

Flat slabs are widely used in construction due to its architectural flexibility, good aesthetic view, uncomplicated formwork and less construction time. But as we know that under the large axial loads, gravity loads and seismic loads the flat slab is poor in resisting the punching shear which causes slab-column joint failure and further results in the collapse of the structure, so there is a need to improve flat slab performance. In this particular study the Flat slab building G+12 is modeled, analyzed and designed as per IS 456:2000 by considering suitable load conditions under seismic zone IV as per IS 1893:2002 in E-Tabs software. An interior column strip slabcolumn joint is considered and designed in ETabs and SAFE for the column and slab respectively. Analytical modeling of column strip slab of 2500x2500mm and column dimension of 500x600mm having a height of 1500mm is done in ANSYS. The boundary condition of the slab is simply supported at all sides and the column is pinned at both upper and lower face. The conventional reinforced slab and Steel Fibre reinforced Self-Compacting concrete slab properties are taken and fed into the ANSYS workbench and Linear static analysis to carry out the column strip slab-column joint behavior against axial loads, reaction force, gravity loads and lateral loads. The Total Deformation, Equivalent Von-mises stresses and Equivalent Elastic strain in slab and the slab-column joint are studied and compared. For SFRSCC slab used in slab-column joint shows almost 15% less Total Deformation of the structure compared to Conventional RC slab against the Axial and gravity loads, whereas during the lateral loads it almost twice effective as compared to conventional RC slab. Similarly the stresses and strains are reduced to large extent in SFRSCC slab which make it better material when used in joint which increases its performance.