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6.3 Wind Load Pattern

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Wind Load Pattern - {Code}
Use the Wind Load Pattern - {Code} form to review and modify the parameters for the specified
wind load. The options on the form depend on the code selected in the Auto Lateral Load dropdown list on the Define Load Patterns form.
The code-specific forms share the following areas, although the specific parameters in a given
area may vary from form to form:
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Exposure and Pressure Coefficients options. Choose an option to define these
coefficients:
o Exposure from Extents of Rigid Diaphragms option. If this option is selected,
provide values for the Wind Direction Angle, Windward Coeff. and Leeward
Coeff. This option allows the same wind load to be applied each time the load
case is assigned.
o Exposure from Shell Objects options. If this option is selected, the Wind
Exposure Parameters area becomes inactive. In that case, use the Assign menu >
Shell Loads > Wind Pressure Coefficients command to specify the windward and
leeward coefficients when the wind load is assigned to a shell object. This option
allows wind load coefficients and wind direction to be applied on an object-byobject basis.
o Exposure from Frame and Shell Objects options. If ASCE 7-02 is selected as
the Auto Lateral Load on the Define Load Patterns form, this area is added to the
Wind Load Pattern - {Code} form. When this option is selected, choose to apply
loads to Shell Objects, or Frame Objects (Open Structure), or both. This allows
specification of wind loading on open structures [i.e., choose the Include Frame
Objects (Open Structure) option only]. With an option(s) selected, specify the
parameters in the Wind Coefficients area on the form.
Wind Exposure Parameters
o Wind Directions and Exposure Widths - Modify/Show button. Click this button to
access the Wind Exposure Width Data form. The spreadsheet is inactive and
available for review only when the Exposure Set Width is Auto Calculated
form Diaphragm Extents by the Program option is selected.
Select the Exposure Set Width is User Defined option to allow manual
manipulation of the data.
The Direction Angles (use semicolon as separator) edit box can be used to
specify the direction of the wind load. Multiple angles can be specified, separated
by semicolons. The angels are measured relative to the X axis.
Use the edit boxes to specify the Story and Diaphragm ID to which wind load is
being applied. Also specify the Width and Depth of the diaphragm, and X and Y
coordinates on a diaphragm-by-diaphragm basis. Right click in a cell to Cut, Copy,
and Paste data within the spreadsheet area. Standard Windows Copy and Paste
commands can be used to copy and paste data into the spreadsheet from another
program, such as Excel, assuming that the original data has the appropriate tabular
format.
The Add Row button can be used to add a data row and the Delete Row(s) button
can be used to delete a row. The Sort Rows button will sort the rows of data based
on the Story ID.
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Wind Coefficients. Specify or select values for code-specific wind coefficients.
Exposure Height. Select the appropriate story levels from the Top Story and Bottom
Story drop-down lists to define the Exposure height. If the Include Parapet check box is
checked, enter a value in the Parapet Height edit box.
Note: Please refer to the Automated Lateral Loads manual for information about the codespecific parameters (Help menu > Documentation > Manuals > Lateral Loads Manual
command).
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