Staircase Design - Span 7.8m.xls 2j254x
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Total height Length(span) Tread Riser Live Load fcu fy cover L/d basic ratio Lt/L(stair flight) h As provided Provide :
5.00 7.80 225.00 200.00 3.00 35.00 460.00 25.00 26.00 0.80 240.00 2514.00 T20-125
m m mm mm kN/m2 N/mm² N/mm² mm
STAIRCASE DESIGN ( Per flight) DEFLECTION M/bd² fs fu Allowable, L/d Actual, L/d
= = = = = =
mm mm²/m
LOADING & MOMENT (Considered 1m width) (T2 +R2) = 9.26 m (Actual slant length)
Weight of waist & steps Live load Design load,F
= = =
66.87 kN 23.40 kN 131.05 kN
Mult
=
102.22 kNm
Note:Extra input due to staircase udl landing beam : DL = 33.43 kN/m LL= 11.70 kN/m Total staircase width = 1.20 m Point load at column(per layer couple stairs) : DL= 20.06 kN LL= 7.02 kN
MAIN REINFORCEMENT M = d = K = Z = = As = Asmin = So,Asreq = =
2.43 155.61 1.35 1.35 40.48 38.05 OK
N REINFORCEMENT 102.22 205.00 0.07 0.92 0.92 1360.73 360.00 1360.73
kNm mm d d mm²/m mm²/m mm²/m
5.00 7.80 225.00 200.00 3.00 35.00 460.00 25.00 26.00 0.80 240.00 2514.00 T20-125
m m mm mm kN/m2 N/mm² N/mm² mm
STAIRCASE DESIGN ( Per flight) DEFLECTION M/bd² fs fu Allowable, L/d Actual, L/d
= = = = = =
mm mm²/m
LOADING & MOMENT (Considered 1m width) (T2 +R2) = 9.26 m (Actual slant length)
Weight of waist & steps Live load Design load,F
= = =
66.87 kN 23.40 kN 131.05 kN
Mult
=
102.22 kNm
Note:Extra input due to staircase udl landing beam : DL = 33.43 kN/m LL= 11.70 kN/m Total staircase width = 1.20 m Point load at column(per layer couple stairs) : DL= 20.06 kN LL= 7.02 kN
MAIN REINFORCEMENT M = d = K = Z = = As = Asmin = So,Asreq = =
2.43 155.61 1.35 1.35 40.48 38.05 OK
N REINFORCEMENT 102.22 205.00 0.07 0.92 0.92 1360.73 360.00 1360.73
kNm mm d d mm²/m mm²/m mm²/m
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