Analysis And Design Of Reinforced Concrete Flat Slab Using Various Codes

Abstract

Beam less oor directly resting on support (column and/ wall) is known as at slab. Because of this, large bending moment and shear force is developed in the slab, near the column. These stresses produce concrete cracking and may lead to the slab fail- ure, hence there is a need to increase the area at top of column to withstand the stresses. This enlarged truncated portion at the top of column is known as column head/ column capital. Flat slabs are subjected to gravity and lateral loads. Gravity load analysis of at slab is carried out by Direct Design Method (DDM) and Equivalent Frame Method (EFM) as prescribed by di erent standards, however nite element analysis and equiv- alent frame method of at slab is carried out for gravity loads using software SAFE (Slab Analysis by Finite Element Method and Equivalent Frame Method). IS 456-2000, ACI 318-08, BS 8110-1997 & EC2-Part1-2004 prescribed the coe - cients for analysis of at slab as per DDM and EFM. Analysis and design of at slab are carried out to compare the coe cients prescribed by di erent standards and by Equivalent frame method using software SAFE for distribution of moments along longitudinal and transverse directions. Slab is divided into column strip and middle strip. IS 456-2000, ACI 318-08, BS 8110-1997 & EC2-Part1-2004 specify the xed value of column strip and middle strip irrespective of interior span and midspan. The present study also incorporates the comparison of distribution of width of column strip and middle strip as per IS 456, ACI 318, BS 8110-1997 & EC2-Part1-2004 and as per Equivalent frame method for the staggered columns and the without the stag- gered column. And a comparison is made. Excel worksheet is also prepared for analysis and design of at slab(with staggered and without staggered columns) as per EFM. EFM includes analysis as per IS 456-2000, ACI-318-08, BS 8110-1997 & EC2-Part1-2004 and using the distribution coefficients along longitudinal and transverse directions.