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Wind Load tab

Used to apply previously created wind load types on the structure through the means of a load case.

Note: If a wind load has not yet been defined for the model, a warning message is displayed in the dialog and the controls are inactive. Refer to the Create Wind Type Definition dialog to learn more about defining a wind load.

Wind Load tab

Used to add static wind forces per ASCE 7 and other codes.

SettingDescription
Select Type Choose a previously defined wind load type from the drop down list.
Exposed Surface and Direction

Specify the global direction in which the wind load is to be generated by clicking the X, Z,  -X, or -Z option. When wind is generated in X direction ,the wind load is applied on the near side and when -X is chosen the load is applied on the far side as explained in the following figures. Generation in Z or -Z is similar.

Wind in X Wind in -X

Wind in positive and negative directions

Table 1. Wind direction explanation
If the direction is set to… and f is… Then the load is applied to surfaces facing… and the load will be directed toward… This can be though of as…
X or Z Positive Negative X or Z Positive X or Z Windward load for wind in the positive X or Z direction
Negative Positive X or Z Negative X or Z Windward load for wind in the negative X or Z direction
-X or -Z Positive Positive X or Z Positive X or Z Leeward load for wind in the positive X or Z direction
Negative Negative X or Z Negative X or Z Leeward load for wind in the negative X or Z direction
Factor Specify the factor by which the calculated wind loads will be multiplied.
Open Structure

Select this option to generate loads on open structures like highway signs or transmission towers. By default, the load generation is based on the assumption that the region between members is covered by panels (i.e., cladding). Setting this option will apply load to only the members (i.e., no cladding).

Tip: The term used here is not the same as the ASCE 7 definition of "open structure." Please use the ASCE 7 Wind Load dialog box to generate describe the enclosure classification per this code.
SNiP Parameters

The following parameters are used for wind loads generated per the Russian code (SNiP).

SettingDescription
Apply Wind Load at the Corner

Select this option for wind loads to be applied at 45°.

Note: This parameter is only applicable for rectangular buildings.
Select Configuration
The building configuration as defined in SNiP 2.01.07–85 "Loads and Actions":
  • 0. Prismatic building structure - Rectangular building- Outstanding architectural details on the left façade.
  • 1. Prismatic building structure - Rectangular building- Both side façades are smooth
  • 2. Prismatic building structure - Rectangular building- Outstanding architectural details on the right façade
  • 3. Prismatic building structure - Rectangular building- Outstanding architectural details on both side façades
  • 4. Prismatic building structure - Rectangular building- Triangular building
  • 5. Prismatic building structure - Rectangular building- Rhombic building
  • 6. Prismatic building structure - Rectangular building- Number of vertices of polygonal building, not more than 12
  • 7. Prismatic building structure - Less than 3 — rectangular building
  • 8. Prismatic building structure - 3 — triangular
  • 9. Prismatic building structure - 4 — rhombic
  • 10. Prismatic building structure - More than 4 — polygonal
  • 11. Framed RC structure
  • 12. Lattice steel structure
Reynolds Number (NU) Specify the wind pressure correlation coefficient. If parameter is omitted or is exactly 1, a computed value is used instead. For rectangular buildings, the correlation coefficient is always calculated automatically, thus any specified value will be ignored.
Note: The first load case which has a Russian Wind Load command added to it will consider all other loads defined in it as the masses to be considered for calculating the dynamic effect which is required by this command.

Wind Load - Dynamic tab

Used to specify dynamic wind forces per SP 20.13330.2016.

SettingDescription
Wind Definition Choose an SP 20.13330.2016 wind load definition from the drop down list.
Width of Building along wind dir Effective length of the structure parallel to wind direction.
Wid of Building across wind dir Effective projection of the structure facing the wind direction.
Ground Level Select if the ground level is not considered (i.e., global Y = 0 is the ground level) or if it is to be specified at different Y coordinate.
Factor Correction factor along specified direction.
Internal Set this option to indicate an internal, or suction, wind force on the surfaces (i.e., the load direction is reversed).
Allow all Mode Shapes Check this option to compute dynamic wind load vector for all mode shapes extracted from Modal Analysis provided it is within code stipulated frequency limit. When this check box is clear, the calculation takes only the first mode shape.
Include Orthogonal Load Check this option to include orthogonal directions in the load case.
Static Wind Case Select a previously defined primary load cases in the model.
Wind Direction Select the plan direction to apply the wind force.
Parent topic: Add New Load Items dialog
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