nib design-cb2-load continue full length

Logo Slave Island Tata Housing Project SUBJECT Nib CB2 REF CALCULATIONS Input Data: Ultimate Load (Fv) = 711 kN Load as a UDL (kN/m) = 593 kN/m Nib Width (Projection) = 325 mm Nib Depth (D) = 500 mm Distance to Load (av) = 325 mm Grade of Concrete (fcu) = 45 N/mm2 Grade of Steel (fy) = 460 N/mm2 Grade of Shear Steel (fvy) = 460 N/mm2 Cover = 25 mm = 16 mm Link Diameter = 10 mm Nib Geometry: BS 8110 = 18 N/mm2 Cl 5.2.3.4 Effective Bearing length is least of a,b,c a.Bearing Length = 1200 mm b.One half bearing length + 1= 700 mm c. = 600 mm Effective Bearing Length = 600 mm Net Bearing Width = (Ultimate Support Reaction)/(Bearing Length x 0.4fcu) >=4 = 65.833 mm Net Bearing Width = 65.833 mm Allowance for spalling = 25 mm Allowance for inaccuracies = 25 mm Nominal Bearing width = 115.83 mm Required Nib Projection = nominal bearing width+25 = 140.83 mm < 325 mm Bearing Length Adequate Design of Nib Effective Depth (d) = 467 mm Design Moment (M) = 192.56 kNm/m M/bd2 = 0.88 100As/bd = 0.234 As = 1092.8 mm2/m As min = 650 mm2/m As required = 1092.8 mm2/m Hence Provided = 1340 mm2/m T 16 @ 150 Check Shear v = 1.2687 N/mm2 100As/bd = 0.29 400/d = 1 vc = 0.51 N/mm2 Enhanced Co. She. Strength (v= 1.46 N/mm2 Shear OK Extra Need if a Beam Asv (V/0.87fy) = 1480.5 mm2/m Main Bar Diameter(ǿ) Bearing Strength(0.4*fcu) CALCUL ATION SHEET CALCUL ATION SHEET CALCUL ATION SHEET CALCUL ATION SHEET CALCUL ATION SHEET CALCUL ATION SHEET ∴ ∴ ∴ ∴ ∴

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This can be used to design Nibs according to BS 8110

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CalcsheetLogoSlave Island Tata Housing ProjectSheet No.:1Date:11/2/15SUBJECTNib CB2Prepared by:Ume

REFCALCULATIONSOUTPUTInput Data:Ultimate Load (Fv)=711kNLoad as a UDL (kN/m)=592.5kN/mNib Width (Projection)=325mmNib Depth (D)=500mmDistance to Load (av)=325mmGrade of Concrete (fcu)=45N/mm2Grade of Steel (fy)=460N/mm2Grade of Shear Steel (fvy)=460N/mm2Cover=25mmMain Bar Diameter()=16mmLink Diameter=10mm

Nib Geometry:BS 8110Bearing Strength(0.4*fcu)=18N/mm2Cl 5.2.3.4Effective Bearing length is least of a,b,ca.Bearing Length=1200mmb.One half bearing length + 100=700mmc.=600mm

Effective Bearing Length=600mm

Net Bearing Width=(Ultimate Support Reaction)/(Bearing Length x 0.4fcu)>=40mm=65.8333333333mm

Net Bearing Width=65.8333333333mm

Allowance for spalling=25mmAllowance for inaccuracies=25mmNominal Bearing width=115.8333333333mmRequired Nib Projection=nominal bearing width+25=140.8333333333mm

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