STAAD Foundation Advanced Help

Wind Load Generation page

Used to input wind load parameters. There are two methods for specifying wind load on a vertical vessel:

  • Directly input the shear force & moment values
  • The program can calculate those values using ASCE 7-2005 (US) or IS-875 III (Indian). The inputs are described in the page, along with code section and/or table numbers for reference.
SettingDescription
< Previous

Steps the Wizard to the previous step.

Next >

Proceeds the Wizard to the next step.

Cancel

Exits the Wizard without creating a new Heat Exchanger Footing job.

User Defined Wind Load

SettingDescription
Shear Specify a base shear due to wind in both X and Z global directions, in the selected units.
Moment Specify a base moment due to wind about both X and Z global directions, in the selected units.

Program Calculated Wind Load - US Code 

SettingDescription
Wind Speed Specify the wind speed provided in the code in miles per hour.
Kd

The Wind Directional Factor: Click on the Table 6.6 button to open the table of code Kd values.

Select a value and then click the OK button to use it.

Note: You may manually enter in any value to override the code-specified table values.
Kz for Velocity Pressure Exposure Coefficient, which is described in section 6.5.6.4 and Table 6.5. Choose the required combination of combo boxes for them.
Kzt Topographic Factor, which is defined in section 6.5.7.2 and determined from figure 6.2.
I

Importance Factor, which is defined in section 6.5.5 and determined from figure 6.1. Click on the Table 6.1 button to open a table of code I values.

Select a value and then click the OK button to use it.

Note: You may manually enter in any value to override the code-specified table values.
G The Gust Effect Factor.
Cf Net Force Coefficient, which is defined in Table T6-10.
SettingDescription
Partial Wind Load % This value represents percentage of full wind speed used in case of test load or erection load combination. As probability of getting full wind speed while test is being carried out is very low.

Program Calculated Wind Load - Indian Code

SettingDescription
Wind Speed Specify the wind speed provided in the code in meters per second.
No of Years (N)

Specify the mean probable design life of the structure.

Risk Level (Pn) The risk level in N consecutive years.
Cf along X Force coefficient along the global X axis.
Cf along Z Force coefficient along the global Z axis.
K3

Topography factor as defined in section 5.3.3 of IS-875 III

Site Class Select the site classification as defined in Section 5.3.2.1 of IS-875 III.
Terrain Category Select the category which describes the surrounding terrain as defined in Section 5.3.2.2 of IS-875 III.