The grid of beams takes load from slab and transfer it towards column. The mechanism in a construction work of building where the building floor system consists of reinforeced concrete slab which is supported on a rectangular grid of beams. The entire reliability analysis was implemented through developing a program in MATLAB software. Grid slab was modelled using ETABS software and the values of moment, shear & deflection at various points of the grid are taken for probabilistic evaluation. Timoshenko plate theory was used for deterministic approach. The study investigates the reliability index and probability of failure of the grid slabs and plotting of the Histogram and probability distribution curve. The variables relating to geometry, material properties and loading are considered as random. Monte Carlo simulation technique and Advanced First Order Second Moment (AFOSM) also known as Fisseler's Algorithm method was employed in the evaluation procedure for both square and rectangular grid slabs. Reliability Analysis as per IS456-2000 in Limit State of Flexure, Shear & Deflection for Square and Rectangular grid slabs have been evaluated with varying rib width and for different grades of concrete and characteristic strength of the steel.
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