To calculate wind load for industrial steel structures and to apply it by using TSD
A. Basic wind speed = 39 m/s
terrain category 2
As per IS 875 part 3
Length of building = 24
width of building = 18 m
Height of building = 17.8 m
Design wind speed Vz = Vb k1 k2 k3
k1 = 1
k2 = 1.06
For 17.8 m height by interpolation method
K3 =1
K4 = 1.15
Vz = 39 x 1x 1.06 x 1 x 1.15 = 47.541 m/s
Pz = 0.6 Vz ^2
= 1356.08 N /m2
= 1.3560 KN/m2
h/w =0.98
L/w = 1.33
Internal pressure coefficient = 0.5 , -0.5
Wind load direction along +Ydirection ( Face A)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.6 |
-0.6 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp =, CPe- CPi |
-1.1 |
-0.1 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-1.485 |
-0.135 |
|
K2 =1.06 |
-1.57 |
-0.14 |
``
Wind load direction along +Y direction ( Face B)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.6 |
-0.6 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp =, CPe- CPi |
-1.1 |
-0.1 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-1.485 |
-0.135 |
|
K2 =1.06 |
-1.57 |
-0.14 |
Wind load direction along +X direction ( Face C)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
0.7 |
0.7 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp =, CPe- CPi |
0.2 |
1.2 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
0.27 |
1.62 |
|
K2 =1.06 |
0.2 |
1.71 |
Wind load direction along + X direction ( Face D)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.2 |
-0.2 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp =, CPe- CPi |
-0.7 |
0.3 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-0.945 |
0.405 |
|
K2 =1.06 |
-1.0 |
0.42 |
WIND LOAD ROOF CALCULATION
Slope = sin `theta` = opp / hyp = 2.81 / 7.851 = 18 degree
Wind load direction along +Y direction ( Face EF)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.38 |
-0.38 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp =CPe- CPi |
-0.88 |
0.12 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-1.188 |
0.162 |
|
k2 = 1.06 |
-2 |
0.17 |
Wind load direction along +Y direction ( Face GH)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.52 |
-0.52 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp = CPe- CPi |
-1.02 |
-0.02 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-1.377 |
-0.027 |
|
k 2 =1.06 |
-1.45 |
-0.02 |
Wind load direction along +X direction ( FaceEG)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.8 |
-0.8 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp = CPe- CPi |
-1.3 |
-0.3 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-1.755 |
-0.405 |
|
k 2 =1.06 |
-1.86 |
-0.42 |
Wind load direction along +X direction ( Face FH)
|
CPe + |
CP I - |
|
|
External pressure coefficient , CPe |
-0.6 |
-0.6 |
|
Internal pressure coefficient , CPi |
0.5 |
-0.5 |
|
Net pressure coefficient Cp = CPe- CPi |
-1.1 |
-0.1 |
|
Design wind pressure, Pz |
1.35 |
1.35 |
|
Wind load on wall( cp x Pz ) KN/m2 |
-1.485 |
-0.135 |
|
k 2 =1.06 |
-1.57 |
-0.14 |
K2 factor for height application