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To calculate wind load for industrial steel structures and to apply it by using TSD

Generate manual wind loading in the design report based IS code as per the following input Basic wind speed = 39m/s Terrain category 2 AIM:- To generate manual wind loading in the design report based IS code as per the following input Basic wind speed = 39m/s Terrain category 2 INTRODUCTION:-The wind load which acts on…

VARSHA MOHAN WAGH
updated on 08 Nov 2022

Generate manual wind loading in the design report based IS code as per the following input

Basic wind speed = 39m/s
Terrain category 2

AIM:- To generate manual wind loading in the design report based IS code as per the following input

Basic wind speed = 39m/s
Terrain category 2

INTRODUCTION:-The wind load which acts on the structure gets distribted on the walls and roof of the structure both externally and internally. Therefore, windload varies based on the height of the structure and on the terrain category.

PROCEDURE:-

Consider IS 875-3 (2015) for manuel wind load calculation for design report.
Given, basic wind speed as 39m/s and terrain category as 2.
Consider following data for calculation:-
- Life of the structure= 50 years (Table 1, Cl. 5.3.1)
- Class of structure = A (Cl. 5.3.2.2)
- Total length of the building, l= 18 m
- Total width of the building, w= 18 m
- Total height of the building, h= 16.88 m
- Therefore, l/w= 1 and h/w= 0.93.

Step 1

External pressure cofficient, Cpe

As per IS 875-3, Table 5

Building height ratio= 1/2
Also, Building plan ratio= 1

Step 2

Find factors (k1, k2, k3, k4)

From table 1 for wind speed of 39 m/s, k1= 1
From table 2 with terrain category 2 and class of the building A
- Building height= 16.88m (from elevation drawing)
- For 15m and 20m tall building, k2 value is 1.05 and 1.07 respectively.
- Therefore, 16.88 m tall building, k2= 1.06 (on interpolating)
From Cl. 6.3.3, Topography Factor, k3= 1
From Cl 6.3.4, Importance Factor, k4= 1.15 (for industrial building)

Step 3

To calculate Design Wind Speed (from Cl 6.3)

Vz= Vb x k1 x k2 x k3 xk4= 39x 1 x 1.06 x 1 x 1.15 , Vz= 47.541 m/s

Step 4

Design wind Pressure (from Cl 7.2)

Pz = 0.6 x Vz^2 =0.6 x 47.541^2 = 1356.09 N/m^2

Pz =1.36 kN/m^2

Step 5

Wind direction (upto roof level)

Step 6: Roof Calculation

External Pressure Coefficient for pitched roof, Consider Table 6, where h/w = 0.93 and roof angle is 18.

By interpolating method,

(-0.7+1.1)/(20-10)= (x+1.1)/(18-10)

x= -0.78

Also, (-0.5+0.6)/(20-10)= (x+0.6)/(18-10)

x= -0.52

Therefore, EF= -0.78 ; FG= -0.52

Step 7: Wind load along +Y direction

Step 8: Wind load along +X direction

External Pressure Coefficient for pitched roof, Consider Table 6, where h/w = 0.93 and roof angle is 18.

Therefore, EG= -0.8 ; FH= -0.6

RESULT:- Hence, generated manual wind loading in the design report based IS code 875 part 3.

Based on the above calculation apply the loadings on the model

AIM:- To apply the loadings on the model based on the above manuel calculation.

INTRODUCTION:- The wind load which acts on the structure gets distribted on the walls and roof of the structure both externally and internally. Therefore, windload varies based on the height of the structure. Loading differs based on the different direction of the wind.

PROCEDURE:-

To apply wind loads on the model, go to LOAD tab. Select LOADCASES in the ribbon window.
Add wind load with load case title Wind + Y + Cpi, Wind + Y - Cpi, Wind + X + Cpi, Wind + X - Cpi.

Wind +Y+ Cpi

To create area load at +Y direction. Select AREA load in ribbon tab.
In load case, select Wind+ Y + Cpi.

In property window, change type of loading to area load, loading direction to Y direction and load intensity to +1.5 kN/m^2 as per the calculation done above.
Pick the load area, ie, at grid line G along +Y direction (which is marked green).

Validate the model on providing area load of 1.5kN/m^2.

Select frame C in project window, to apply wind load along Y direction.
Select Wind + Y+ Cpi in loadcase. Select area load.
Change to Y direction in property window and load intensity to 1.5kN/m^2 as wind load on the wall is 1.5kN/m^2 as per calculation done above .
Pick the area to create area load.

In 3D view, after applying wind load to frame C.

Now, to apply wind along X direction (ie, internal load pressure)
Apply a load -0.3kN/m^2 in - X direction in frame 1 and a load of 1.02 kN/m^2 in +X direction in frame 4.

INTERNAL LOAD PRESSURE FOR WIND+Y+Cpi ALONG -X DIRECTION

ROOF LOAD (WIND+Y+Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -1.74kN/m^2.
Pick the roof panel to apply the load(ie, roof panel EF).

After turning OFF, wind panel, roof panel and members in scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel.
Again, apply a load of -1.39 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind+Y+Cpi is shown below.
On validation there is no error.

b. Wind +Y-Cpi

Similarly, apply wind load as followed in Wind+Y +Cpi.
Change loadcase to Wind+Y -Cpi.
Select frame G, pick the area load in ribbon load.
In property window, change direction to Y and load intensity to 0.14kN/m^2.
Pick the area to apply the area load.

Select frame C, pick the area load in ribbon load.
In property window, change direction to Y and load intensity to 0.14kN/m^2.
Pick the area to apply the area load.

Similarly, select frame 1(ie face A), pick the area load in ribbon load.
In property window, change direction to -X and load intensity to -1.64kN/m^2.
Pick the area to apply the area load.

Similarly, select frame 4(ie face B), pick the area load in ribbon load.
In property window, change direction to +X and load intensity to 0.34kN/m^2.
Pick the area to apply the area load.

Check in 3D view and validate the model. Hence no error.

ROOF LOAD (WIND+Y-Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -0.39kN/m^2.
Pick the roof panel to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel.
Apply a load of -0.03 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind+Y-Cpi is shown below.
On validation there is no error.

c. Wind -Y+Cpi (Wind along Face C)

Similarly, change loadcase to Wind-Y +Cpi.
Select frame C, pick the area load in ribbon load.
In property window, change direction to Y and load intensity to -1.5kN/m^2.
Pick the area to apply the area load.

Select frame G, pick the area load in ribbon load.
Similarly, change loadcase to Wind-Y +Cpi.
In property window, change direction to Y and load intensity to -1.5kN/m^2.
Pick the area to apply the area load.

Select frame 1, pick the area load in ribbon load.
Similarly, change loadcase to Wind-Y +Cpi.
In property window, change direction to X and load intensity to -1.02kN/m^2.
Pick the area to apply the area load.

Select frame 4, pick the area load in ribbon load.
Similarly, change loadcase to Wind-Y +Cpi.
In property window, change direction to X and load intensity to 0.3kN/m^2.
Pick the area to apply the area load.

Therefore, in 3D view.

ROOF LOAD (WIND-Y+Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -0.39kN/m^2.
Pick the roof panel (ie, panel EF) to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel(ie, GH).
Apply a load of -1.75 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind-Y+Cpi is shown below.
On validation there is no error.

d. Wind -Y-Cpi (Wind along Face C)

Similarly, change loadcase to Wind-Y -Cpi.
Select frame C, pick the area load in ribbon load.
In property window, change direction to Y and load intensity to -0.14kN/m^2.
Pick the area to apply the area load.

Select frame G, pick the area load in ribbon load.
Similarly, change loadcase to Wind-Y -Cpi.
In property window, change direction to Y and load intensity to -0.14kN/m^2.
Pick the area to apply the area load.

Select frame 1, pick the area load in ribbon load.
Similarly, change loadcase to Wind-Y -Cpi.
In property window, change direction to X and load intensity to -0.34kN/m^2.
Pick the area to apply the area load.

Select frame 4, pick the area load in ribbon load.
Similarly, change loadcase to Wind-Y -Cpi.
In property window, change direction to X and load intensity to 1.64kN/m^2.
Pick the area to apply the area load.

Therefore, in 3D view.

ROOF LOAD (WIND-Y-Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -0.03kN/m^2.
Pick the roof panel (ie, panel EF) to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel(ie, GH).
Apply a load of -0.39 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind-Y-Cpi is shown below.
On validation there is no error.

e. Wind +X+Cpi

Similarly, change loadcase to Wind+X+Cpi.
Select frame 1, pick the area load in ribbon load.
In property window, change direction to X and load intensity to 0.3kN/m^2 as Wind load on wall along +X direction (Face A) is 0.272kN/m^2.
Pick the area to apply the area load.

Select frame 4, pick the area load in ribbon load.
Similarly, change loadcase to Wind+X+Cpi.
In property window, change direction to X and load intensity to 1.02kN/m^2 as Wind load on wall along +X direction (Face B) is 1.02kN/m^2.
Pick the area to apply the area load.

Select frame C, pick the area load in ribbon load.
Similarly, change loadcase to Wind+X+Cpi.
In property window, change direction to Y and load intensity to 1.5kN/m^2 as Wind load on wall along +Y direction (Face C) is 1.5kN/m^2.
Pick the area to apply the area load.

Select frame G, pick the area load in ribbon load.
Similarly, change loadcase to Wind+X+Cpi.
In property window, change direction to Y and load intensity to -1.5kN/m^2 as Wind load on wall along -Y direction (Face D) is 1.5kN/m^2.
Pick the area to apply the area load.

ROOF LOAD (WIND+X+Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -1.8kN/m^2.
Pick the roof panel (ie, panel EG) to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel(ie, FH).
Apply a load of -1.5 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind+X+Cpi is shown below.
On validation there is no error.

f. Wind +X-Cpi

Similarly, change loadcase to Wind+X-Cpi.
Select frame 1, pick the area load in ribbon load.
In property window, change direction to X and load intensity to 1.64kN/m^2 as wind load on wall along +X direction (Face A) for -Cpi is 1.64kN/m^2.
Pick the area to apply the area load.

Select frame 4, pick the area load in ribbon load.
Similarly, change loadcase to Wind+X-Cpi.
In property window, change direction to X and load intensity to 0.34kN/m^2 as wind load on wall along +X direction (Face B) for -Cpi is 0.34kN/m^2.
Pick the area to apply the area load.

Select frame C, pick the area load in ribbon load.
Similarly, change loadcase to Wind+X-Cpi.
In property window, change direction to Y and load intensity to 0.14kN/m^2 as wind load on wall along +Y direction (Face C) for -Cpi is 0.14kN/m^2.
Pick the area to apply the area load.

Select frame G, pick the area load in ribbon load.
Similarly, change loadcase to Wind+X-Cpi.
In property window, change direction to Y and load intensity to -0.14kN/m^2 as wind load on wall along -Y direction (Face D) for -Cpi is 0.14kN/m^2.
Pick the area to apply the area load.

ROOF LOAD (WIND+X-Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -0.41kN/m^2.
Pick the roof panel (ie, panel EG) to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel(ie, FH).
Apply a load of -0.14 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind+X-Cpi is shown below.
On validation there is no error.

g. Wind -X+Cpi

Similarly, change loadcase to Wind-X+Cpi.
Select frame 1, pick the area load in ribbon load.
In property window, change direction to X and load intensity to -1.02kN/m^2 as wind load on wall along -X direction (Face A) for +Cpi is 1.02kN/m^2.
Pick the area to apply the area load.

Select frame 4, pick the area load in ribbon load.
Similarly, change loadcase to Wind-X+Cpi.
In property window, change direction to X and load intensity to -0.3kN/m^2 as wind load on wall along -X direction (Face B) for +Cpi is 0.3kN/m^2.
Pick the area to apply the area load.

Select frame G, pick the area load in ribbon load.
Similarly, change loadcase to Wind-X+Cpi.
In property window, change direction to Y and load intensity to -1.5kN/m^2 as wind load on wall along -Y direction (Face C) for +Cpi is 1.5kN/m^2.
Pick the area to apply the area load.

Select frame C, pick the area load in ribbon load.
Similarly, change loadcase to Wind-X+Cpi.
In property window, change direction to Y and load intensity to 1.5kN/m^2 as wind load on wall along Y direction (Face D) for +Cpi is 1.5kN/m^2.
Pick the area to apply the area load.

ROOF LOAD (WIND-X+Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -1.5kN/m^2.
Pick the roof panel (ie, panel FH) to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel(ie, EG).
Apply a load of -1.8 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind-X+Cpi is shown below.
On validation there is no error.

h. Wind -X-Cpi

Similarly, change loadcase to Wind-X-Cpi.
Select frame 4, pick the area load in ribbon load.
In property window, change direction to X and load intensity to -0.34kN/m^2 as wind load on wall along -X direction (Face A) for -Cpi is 0.34kN/m^2.
Pick the area to apply the area load.

Select frame 1, pick the area load in ribbon load.
Similarly, change loadcase to Wind-X-Cpi.
In property window, change direction to X and load intensity to -1.64kN/m^2 as wind load on wall along -X direction (Face B) for -Cpi is 1.64kN/m^2.
Pick the area to apply the area load.

Select frame G, pick the area load in ribbon load.
Similarly, change loadcase to Wind-X-Cpi.
In property window, change direction to Y and load intensity to -0.14kN/m^2 as wind load on wall along -Y direction (Face C) for -Cpi is 0.14kN/m^2.
Pick the area to apply the area load.

Select frame C, pick the area load in ribbon load.
Similarly, change loadcase to Wind-X-Cpi.
In property window, change direction to Y and load intensity to 0.14kN/m^2 as wind load on wall along +y direction (Face D) for -Cpi is 0.14kN/m^2.
Pick the area to apply the area load.

ROOF LOAD (WIND-X-Cpi)

Turn ON the roof panel in 3D scene view .
Select area load in load ribbon tab.
In property window, set direction to global Z and load intensity to -0.14kN/m^2.
Pick the roof panel (ie, panel FH) to apply the load.
After turning OFF the roof panel again in the scene content. The loading on the roof appears as shown below.

Again, turn ON the roof panel to apply load on the adjacent roof panel(ie, EG).
Apply a load of -0.41 kN/m^2 on the adjacent roof panel along the Z direction.

Therefore, wind and roof load for loadcase Wind-X+Cpi is shown below.
On validation there is no error.

RESULT:- Therefore, load is applied on the model based on the above calulation.

3. On a separate model generate wind loading using wind wizard

AIM:- To generate wind loading using wind wizard on a seperate model.

INTRODUCTION:- In the Wind Wizard, we can directly input the site condition which automatically generates wind load on the model.

PROCEDURE:-

Save the previous used file and save as this file to a new name.
In the LOAD tab, delete all prevoiusly created wind load in the load case to create wind wizard.
In load tab, pick WIND LOAD in the ribbon window and then WIND WIZARD.