To calculate wind load for industrial steel structures and to apply it by using TSD
WEEK 5 CHALLENGE
1. Answer:
Using the following input, generate manual wind loading in the design report based on the IS code.
Wind speed at base = 39 m/s
Category 2 terrain
Manual |
|
| Wind Load Calculation | |
| AS per IS 875 Part 3 | |
| Basic wind speed(Vb) | 39 m/s |
| (From Annexure A Clause 6.2 of IS 1893 Part 3) | |
| Probable Design Life of structure | 50 years |
| Terrian Category | 2 |
| Class of the Structure | A |
| Horizontal Dimension of structure(Greater)I | 24 |
| Horizontal Dimension of structure(Lesser)w | 18 |
| Eaves level Height of structure | 14 |
| Width of Frame 1 between the Grids | 7.2 |
| Ratio for Wall and Roof Coefficients Wall | 11w h/w |
| wall h/w | 0.78 |
| wall I/w | 1.33 |
| Roof h/w | 0.78 |
Calculations:
Topography Factor k3 From Clause 6.3.3 1 Risk Coefficient kl From Table 1 1
Height in m up to 10 m
Terrian Height factor k2 = 1
Important Factor for Cyclonic Region k4 = 1.15
Design wind Speed Vz = Vb*kl"k2" k4 44.85 m/s
Design Wind Pressure Pz Vz^2 1206.9135 N/m2 1.207
Roof Angle alpha Internal Pressure Coefficient Internal Pressure Coefficient = 16 deg
0.5 (up to 20% opening) -0.5 (up to 20% opening)
Wall Loading Calculation Wind Direction = +Y
For face A
Height at Different Level = Cpi+ Cpi-up to 10 m up to 10 m
External pressure coefficient Cpe 0.7 0.7
Internal pressure coefficient Cpi 0.5 -0.5
Net pressure coefficient Cp 0.2 1.2
Design wind pressure for wall 1.207 1.207
Loading to be applied on the wall in KN/m2 0.241 1.448
After application of factor 1.05 in KN/m2 0.253 1.52 Cpi+ Cpi-For
For Face B
Height at Different Level = up to 10 m up to 10 m
External pressure coefficient Cpe -0.25
Internal pressure coefficient Cpi 0.5 -0.5
Net pressure coefficient Cp -0.75 0.25
Design wind pressure for wall 1.207 1.207
Loading to be applied on the wall in KN/m2 -0.905 0.302
After application of factor 1.05 in KN/m2 rounded -0.95 0.32
Wall Loading Calculation Wind Direction
Wind Driection = -Y
Face B
height at Different Level = up to 10 m up to 10 m
pressure coefficient Cpe 0.7 mal pressure coefficient Cpi 0.5
pressure coefficient Cp 0.2 ign
wind pressure for wall 1.207 ding to be applied on the wall in KN/m2 0.241 r application of factor 1.05 in KN/m2 0.253
Face A
ht at Different Level = mal pressure coefficient Cpe mal pressure coefficient Cpi Net pressure coefficient Cp Design wind pressure for wall Loading to be applied on the wall in KN/m2 After application of factor 1.05 in KN/m2 rounded
Cpi+ Cpi-
up to 10 m up to 10m -0.25 0.5 -0.75 1.207 -0.905 -0.95
For face D & C (Face reversed)
Height at Different Level = External pressure coefficient Cpe
Internal pressure coefficient Cpi Net pressure coefficient Cp
Design wind pressure for wall Loading to be applied on the wall in KN/m2
After application of factor 1.05 in KN/m2 rounded
Cpi+ Cpi-
up to 10 m upto lOm
-0.6 0.5 -1.1 1.207 -1.328 -1.4
-0.6 -0.5 -0.1 1.207 -0.12 -0.13
Roof Load Calculation
| Roof Load Calculation | ||
| Wind Direction = +Y | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | -0.56 | -0.56 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -1.06 | -0.06 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -1.28 | -0.072 |
| After application of factor 1.05 in KN/m2 rounded | -1.4 | -0.08 |
| For Roof FH | ||
| Wind Direction = +Y | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | -0.4 | -0.4 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -0.9 | 0.1 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -1.09 | 0.121 |
| After application of factor 1.05 in KN/m2 rounded | -1.2 | 0.13 |
Wall Loading Calculation
| Wall Load Calculation | Face A | |
| Wind Direction = +X | ||
| For Roof FH | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | -0.56 | -0.56 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -1.06 | -0.06 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -1.28 | -0.072 |
| After application of factor 1.05 in KN/m2 rounded | -1.4 | -0.08 |
Wall Loading for Face B
| Wind Direction = +X | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | -0.4 | -0.4 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -0.9 | 0.1 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -1.09 | 0.121 |
| After application of factor 1.05 in KN/m2 rounded | -1.2 | 0.13 |
| For Face C | ||
| Wind Direction = +Y | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | 0.7 | 0.7 |
| Internal pressure coefficient Cpi | -0.5 | -0.5 |
| Net pressure coefficient Cp | 1.2 | 0.2 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | 0.241 | 1.448 |
| After application of factor 1.05 in KN/m2 rounded | -1.4 | -0.13 |
| For Face D | ||
| Wind Direction = +Y | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | -0.1 | -0.1 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -0.6 | 0.4 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -0.724 | 0.483 |
| After application of factor 1.05 in KN/m2 rounded | -0.77 | 0.51 |
| Roof Load Calculation EG | ||
| Wind Direction = +X | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | -0.76 | -0.76 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -1.26 | -0.26 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -1.52 | -0.314 |
| After application of factor 1.05 in KN/m2 rounded | -1.6 | -0.33 |
| Roof Load Calculation FG | ||
| Wind Direction = +X | ||
| For Roof EG | Cpi+ | Cpi- |
| Height at Different Level = | up to 10 m | up to 10 m |
| External pressure coefficient Cpe | 0 | 0 |
| Internal pressure coefficient Cpi | 0.5 | -0.5 |
| Net pressure coefficient Cp | -0.5 | 0.5 |
| Design wind pressure for wall | 1.207 | 1.207 |
| Loading to be applied on the wall in KN/m2 | -0.6 | -0.603 |
| After application of factor 1.05 in KN/m2 rounded | -0.63 | -0.65 |