Dog Legged Staircase 463
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DESIGN OF DOG LEGGED STAIRCASE Floor Beam Data Internal Dimensions Length = 4.9 m Width = 2.6 m Floor Height = 3 m Fck = 20 Fy = 415 Riser = 150 mm Tread = 300 mm 4900 Landing width = 1200 mm mm Effective Span = 5.1 m DOWN UP Height of each fli = 1.5 m No. of risers in each fligh 10 Nos No. of Tread in each flight 9 Nos Design 1200 mm d = 161 mm Required D = 175 mm Mid Landing Beam d = 154 mm 2600 mm Loads DL of waist slab = 4.375 PLAN DL on horizontal a = 4.89 DL of steps = 1.875 LL = 3 FF = 1.5 Total load = 11.27 Ld = 570 mm Factored load = 16.9 (of one flight) BM and SF Mu = 55 kN-m Vu = 43 kN 300 d from BM consideration 141 mm mm Y8 @ 270 mm C/C (Distribution Reinforcement) k = 2.317 Y12@96 mm C/C pt = 0.763 % (Main Reinforcement) Ast = 1175 175 mm 175 mm Main Reinforcement Dia = 12 mm DETAILING Spacing = 96 mm Distribution Steel Ast = 185 Dia of bar = 8 mm Spacing = 270 mm N/mm 2 N/mm 2 kN/m 2 kN/m 2 kN/m 2 kN/m 2 kN/m 2 kN/m 2 mm 2 mm 2
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Dog Legged Staircase 463
Transcript of Dog Legged Staircase 463
Sheet1DESIGN OF DOG LEGGED STAIRCASEFloor BeamDataInternal DimensionsLength=4.9mWidth=2.6mFloor Height=3mFck=20N/mm2Fy=415N/mm2Riser=150mmTread=300mm4900Landing width=1200mmmmEffective Span=5.1mDOWNUPHeight of each flight=1.5mNo. of risers in each flight10NosNo. of Tread in each flight9NosDesign1200 mmd=161mm RequiredD=175mmMid Landing Beamd=154mm2600mmLoadsDL of waist slab=4.375kN/m2PLANDL on horizontal area=4.89kN/m2DL of steps=1.875kN/m2LL=3kN/m2FF=1.5kN/m2Total load=11.27kN/m2Ld = 570 mmFactored load=16.9(of one flight)BM and SFMu=55kN-mVu=43kN300d from BM consideration141mmmmY8 @ 270 mm C/C (Distribution Reinforcement)k=2.3170Y12@96 mm C/Cpt=0.763%(Main Reinforcement)Ast=1175mm2175 mm175 mmMain ReinforcementDia=12mmDETAILINGSpacing=96mmDistribution SteelAst=185mm2Dia of bar=8mmSpacing=270mmDevelopment LengthLd=Ld = ( x s) / (4 x Tbd)Therefore, Ld=564mmProvide, Ld=570mmValues of Tbd Design bond stress N/mm21.92Grade of concrete250415201.21.92251.42.24301.52.4351.72.72401.93.04 = Dia of bar=12mms = 0.87 x fy=361.05Tbd = Design bond stress N/mm2 =1.92
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