Staircase Design - Span 7.8m.xls
2
STAIRCASE DESIGN Total height 5.00 m ( Per flight) Length(span) 7.80 m DEFLECTION Tread 225.00 mm M/bd² = Riser 200.00 mm fs = Live Load 3.00 kN/m2 fu = fcu 35.00 N/mm² = fy 460.00 N/mm² Allowable, L/d = cover 25.00 mm Actual, L/d = L/d basic ratio 26.00 Lt/L(stair flight) 0.80 h 240.00 mm As provided ### mm²/m Provide : T20-125 LOADING & MOMENT (Considered 1m width) MAIN REINFORCEMENT = 9.26 m M = (Actual slant length) d = Weight of waist & st = 66.87 kN K = Live load = 23.40 kN Z = Design load,F = 131.05 kN = As = Mult = 102.22 kNm Asmin = So,Asreq = = 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 Ö(T 2 +R 2 )
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Staircase Design
Transcript of Staircase Design - Span 7.8m.xls
STAIRCASE DESIGNTotal height 5.00 m ( Per flight)Length(span) 7.80 m DEFLECTIONTread 225.00 mm M/bd² =Riser 200.00 mm fs =Live Load 3.00 kN/m2 fu =fcu 35.00 N/mm² =fy 460.00 N/mm² Allowable, L/d =cover 25.00 mm Actual, L/d =L/d basic ratio 26.00Lt/L(stair flight) 0.80h 240.00 mmAs provided 2514.00 mm²/mProvide : T20-125
LOADING & MOMENT (Considered 1m width) MAIN REINFORCEMENT
= 9.26 m M =(Actual slant length) d =Weight of waist & steps = 66.87 kN K =Live load = 23.40 kN Z =Design load,F = 131.05 kN =
As =Mult = 102.22 kNm Asmin =
So,Asreq = =
Note:Extra input due to staircaseudl landing beam :DL = 33.43 kN/mLL= 11.70 kN/m
Total staircase width = 1.20 mPoint load at column(per layer couple stairs) :DL= 20.06 kNLL= 7.02 kN
Ö(T2 +R2)
2.43155.61
1.351.35
40.4838.05 OK
MAIN REINFORCEMENT
102.22 kNm205.00 mm
0.070.92 d0.92 d
1360.73 mm²/m360.00 mm²/m
1360.73 mm²/m
