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Design of Slab Here the aspect ratio Ly/Lx is greater than 2 hence the slab is designed as a one way slab. OneShortEdgeDisContinuous: Basic dimensions of slab = Lx Ly 3 6.5 Basic Ly/Lx ratio = 2.167 >2 Hence designed as an one way slab Clear cover to reinforcement d' = 25 mm Provided overall depth D = 150.00 mm Effective depth d = 120.00 mm Diameter of bar f = 10 mm Select Grade of Concrete fck = 20 N/mm² Select Grade of Steel fy = 415 N/mm² Load calculation : Dead load of the slab DL = 3.750 kN/m² Floor finish(Roof finish) FF = 1.9 kN/m² Live load LL = 1.5 kN/m² Total load TL = 7.150 kN/m² Moment and Area of Steel calculations: Mu Mu/bd² Pt Ast reqd Min Ast Dia of ba Spacing Ast pro kN.m N/mm 2 % mm² mm² mm mm mm² 12.07 0.08 0.24% 293.37 144 10 200 392.70 safe 0.06 0.05 0.03 Check for Deflection The effective depth provided = 120. 000 mm From figure 3 of I.S 456:1978 modification factor is Modification factor = 1.36 Required depth under deflection consideration = 45 .8 7 mm HENCE SAFE
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onewayDesign of SlabHere the aspect ratio Ly/Lx is greater than 2 hence the slab is designed as a one way slab.Effective depth required115.3846153846mmOneShortEdgeDisContinuous:Basic dimensions of slab=LxLy36.5Basic Ly/Lx ratio=2.167>2Hence designed as an one way slabClear cover to reinforcementd'=25mmProvided overall depthD=150.00mmEffective depthd=120.00mmDiameter of barf=10mmSelect Grade of Concretefck=20N/mmSelect Grade of Steelfy=415N/mmLoad calculation :Dead load of the slabDL=3.750kN/mFloor finish(Roof finish)FF=1.9kN/mLive loadLL=1.5kN/mTotal loadTL=7.150kN/mMoment and Area of Steel calculations:MuMu/bdPtAst reqdMin AstDia of barSpacingAst prokN.mN/mm2%mmmmmmmmmm12.070.080.24%293.3714410200392.70safe0.060.050.03Check for DeflectionThe effective depth provided=120.000mmFrom figure 3 of I.S 456:1978 modification factor isModification factor=1.36Required depth under deflection consideration=45.87mmHENCE SAFEcheck for shearfactoredsheartouvPttoucloadforce32.17548.26250.40218750.32724923470.402
Simply suppurtedcontinuous
TWO SLABDesign of SlabHere the aspect ratio Ly/Lx is less than 2 hence the slab is designed as a two way slab.TwoAdjacentEdgesDisContinuous:Basic dimensions of slab=LxLy46Basic Ly/Lx ratio=1.500
