Wind Pressure Coefficients

Form:  Shell Load Assignment - Wind Pressure Coefficient

Use the Assign menu > Shell Loads > Wind Pressure Coefficient command to assign wind pressure coefficient to selected shell objects.

1. Define the Wind Load Pattern to which the shell object is to be assigned.

2. Select the shell object(s) to which the wind pressure coefficients are to be assigned.

Note:  The Draw menu > Auto Draw Cladding command can be used to add shell objects around the outermost perimeter of the building. Those objects can then be selected before proceeding to the next step.  Click the  Select menu > Select > Labels > Shell Labels command to bring up the Select by Shell Label form to select the shell objects on a face-by-face basis (e.g., A1, A2, A3, A4).

3. Click the Assign menu > Shell Loads > Wind Pressure Coefficient command to access the Shell Load Assignment - Wind Pressure Coefficient  form. Make selections in the following areas of the form:

• Wind Load Pattern Name drop-down list. Select the wind load pattern defined in Step 1.

• Wind pressure

• • Specify a value in the Coefficient Cp edit box. Wind loads will be generated on each area object that has been assigned this  wind pressure coefficient.

  • Select the Windward (varies) or Leeward or Sides (constant) option. The windward coefficient, Cp, and the leeward coefficient, Cp, are used in calculating the wind pressures on the windward and leeward sides of the  diaphragms, respectively. The windward side of a diaphragm is the side exposed to the wind, while the opposite side is the leeward side.

• Options

• • Replace Existing Loads: Replaces the currently specified wind load, if any, with the new wind load. If no assignment exists, the new assignment is still made. This is the default option.

  • Delete Existing Loads: Deletes any and all wind load assignments made to the selected shell object(s). When this option is selected, the items in the Wind pressure area of the form are ignored when the OK button is clicked.

Note that the default option is Replace and that the program defaults to this every time the form is opened.

4. Click the Apply button to complete the assignment.
   
   When the Apply button is used, the Shell Load Assignment - Wind Pressure Coefficient form will remain open until it is closed by clicking the Close button. This allows selection of another frame object(s), to which another assignments can be made.<="">
   
   If only one assignment is being made to only one set of selected objects, the OK button can be used to both apply the assignment and close the form.

See also:

No selected items form