analysis of spiral staircase in sap2000Description complète
analysis of spiral staircase in sap2000Full description
analysis of spiral staircase in sap2000
Design of staircase as per IS 456
In this project we are aimed at making an automatic stair climbing wheelchair with bed. A concept for a stair climbing wheelchair capable of moving in structured and unstructured environment…Full description
it can be used as referenceFull description
DESIGN OF STAIR CASE
2.40 M 1.20 M
x x
2.25 M
y
y
1.50 M
250 M 0.25 M
3.50 M
Clear span m Width m Span of the landing m Width of landing m Live load on the floor Kn/sq.m Concentrated load kN Location from the support m Unit weight of concrete kN/cum Permissible stresses: Es N/mm² Grade of concrete N/mm² Grade steel N/mm² Permissible stress in concrete N/mm² Permissible stress in steel N/mm² Moment of Resistence of concrete: m= k= j=
1/3/30/2013/staircase_R6.xls/d.s.anand
166 M
2.25 M 1.20 M 0.25 M 1.20 M 5 0 0 25 25000 25 415 8.5 230 11 0.289 0.904
Q= Rise & Tread Rise Tread No. of flights Min. thickness= Thickness of waist slab Thickness of landing Loads: UDL: Self weight waist slab on plan
1.110 mm mm mm mm mm R=
Dead load of each step/m in hor plan Dead load of each step/m Floor finish Dust load Live load Handrail TOTAL Factored load
2/3/30/2013/staircase_R6.xls/d.s.anand
250 M 166 M 14.00 200 200 OK 300.09 hypotenuse of step 5.000 kN/m 9.039 3.125 0.600 1 5.000 0.104 18.868 28.302
kN/m kN/m kN/m kN/m kN/m kN/m kN/m kN/m
Bending moment & Shear Forces: Load/m run kN/m Span m M(centre)= kN-m Dia. Of bar mm Cover mm Effective depth mm xumax/d Qlim= Mu_lim kN-m d= kN-m 2 Mu/bd Pt= % Ast= mm2 Minimum steel(.15%bD) mm2 Dia of bar mm Area mm2 Spacing mm Spacing provided= mm Area provided= mm2 Ast/bd= Check for shear Vu= Shear stress % of steel= correction factor= Permissible shear stress= Permissible Shear stre k Balance shear
kN N/mm2 k N/mm2 N/mm2 N/mm2
Check for development length Assume development length= Lo Pt Mu1/bd2= Mu1= Vu= or 1.3Mu1/Vu+Lo>=58
12 0.45 1.507 42033406 48694 1122 >=58.00 24.395 mm
REVISE DEPTH
Check for deflection: Span/d= Pt Modification factor K x L/d = Permissible L/d=modification factor x20*K
21 0.45 % 0.82 16.95 33 OKAY
DESIGN OF FLIGHTS: Inclined length of slab sqrt(r2+t2) mm Thickness of waist slab mm Dust load Self load in plan Floor finish/step=(r+t)/t x 1 weight of step L.L. Total Load Factored load
300.09 200.00
kN/m2 kN/m2 kN/m2 kN/m2 kN/m2 kN/m2 kN/m2
1.00 9.04 2.51 3.13 5.00 20.67 31.00
31.00kN/m 28.30kN/m
512.5
Rb
300
2x= 1650 mm G y x x 2y= 400 mm G= 2.25 m Effective span= 3275 mm Ra=Rb= kN Mu= kN-m Mu/[QLx1000] d_required mm
4/3/30/2013/staircase_R6.xls/d.s.anand
y
49.39 41.213 167.50
d_provided Mu/bd2= pt= Ast= Dia of bar Area Spacing Spacing provided= Area provided= Ast/bd=
Distribution steel: Area of steel Dia of bar Area Spacing Spacing provided Area provided= Check for shear Vu= Shear stress % of steel= Permissible shear= correction factor= Permissible Shear stre k Balance shear