پاورپوینت انواع راه پله ونحوه طراحی آن انگلیسی

Stair Types
Straight stairs

Stair Type based on the structural loading type
Simply supported stair
(transversely supported)
Longitudinally supported stair
Cantilever stair

Simply supported stair
Design a straight flight stair in a residential building supported on reinforced concrete wall 1.5 m )(center to center)
L.L = 3kN/m2
Covering Material = 0.5kN/m
The riser are 16cm and goings are 30 cm

Loads and Analysis
D.L(O.W) =0.34*0.075*25 + 0.5*0.16*0.3*25=1.24 kN/m
D.L (covering material) = 0.5 kN/m

D.L (total) = 1.74 kN/m
L.L =3*(0.3) =0.9 kN/m

Design for moment
Design for shear

Longitudinal – Supported stairs

Design a U- stair in a residential building L.L = 3 kN/m2
Covering Material = 2 kN/m2
The riser are 16 cm and goings are 30 cm
Longitudinal – Supported stairs (Example)

Loads and Analysis
D.L (slab) = 0.22*25 =5kN/m2
D.L (step) = 0.5*0.16*25=2 kN/m2
D.L (covering material) = 2 kN/m2

D.L (flight) = 9 kN/m2
D.L (landing) = 7 kN/m2
L.L =3 kN/m2

Wu (flight) = 1.2(9)+1.6(3)=15.6kN/m
Wu (landing) = 1.2(7)+1.6(3)=13.2kN/m

Design for moment
Design for shear

Reinforcement Notes

Cantilever Stair

Cantilever stairs (Example)
Design a cantilever straight flight stair in a residential building
L.L = 3kN/m2
Covering Material = 0.5kN/m
The riser are 16cm and goings are 30 cm

D.L(O.W) =0.15*0.075*25 + 0.15*0.075*25=0.6 kN/m
D.L (covering material) = 0.5 kN/m

D.L (total) = 1.1 kN/m
L.L =3*(0.3) =0.9 kN/m

Wu = 1.2(1.1)+1.6(0.9) = 2.76 kN/m
Vu = 2.76(1.5) = 4.14 kN
Mu = WuL2/2 = 3.1 kN.m

Design for moment
Design for shear

Longitudinal – Supported stairs Open-well stairs

General Example