10 - Design of Purlins
10 - Design of Purlins
10 - Design of Purlins
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Roof Purlins
Roof
Purlin
1- Dead Loads:
MxD.L = WxD.L x S2 / 8
MyD.L = WyD.L x S2 / 8
QxD.L = WxD.L x S / 2
QyD.L = WyD.L x S / 2
a) Uniform Load
WL.L = L.L x a
Kg/m2
3- Wind Loads:
Wxwind = Ce x k x q x a / cos a
3- Wind Loads:
Wxwind = Ce x q x a / cos a
Mxwind = Wxwind x S2 / 8
Mywind = 0
Qxwind = Wxwind x S /2
Qywind = 0
2nd Check on :
M rx M ry
• For laterally supported sections
x x
h 112
Vn 0.6Fy A w
tw Fy
112 h 139 112 / Fy
< Vn 0.6Fy Aw
Fy t w Fy h / t w
139 h 9500
< 260 Vn 2
Aw
Fy t w h / t w
Truss
S/2 T5
T1 T2 T3 T4 S
S/2
θ
Truss
T5
S/3 T2
T1 T3 T4
S/3 S
S/3 θ
Truss