M.To add an ASCE 7 wind load definition
To populate the wind intensity table with values calculated per ASCE 7, use the following procedure.
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In the
Load & Definition dialog, select the
Definitions > Wind Load entry and then click
Add.
The Add new: Wind Definition dialog opens.
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Select one of the following options from the Code
drop-down list:
- ASCE 7: 1995
- ASCE 7: 2002
- ASCE 7: 2010
- ASCE 7: 2016
Tip: You can also type optional Comments to further describe the wind definition (e.g.,Wind in X direction
). -
Click Add.
The definition type is added to the Definitions > Wind Load entry in the Load & Definition dialog.
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In the Load & Definition dialog, select
the new wind definition type and click the Add.
The Add New: Wind Definitions dialog opens. The dialog now displays the Intensity and Exposures tabs.Note: The previously selected Code displays as a read-only selection.
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Click Generate.
The ASCE-7: Wind Load dialog opens.
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On the Common tab, enter the general code and site information:
- Select the year (edition) of ASCE-7 code.
- Select the Building Classification Category.
- Type the Basic Wind Speed in the selected units.
- Select the Exposure Category.
- Select the Structure Type that best describes your structure.
- For ASCE 7-16, type the Height Above Sea Level of the base of the structure and select the appropriate units of length for this input.
- If you need to Consider wind speed-up over Hills or Enscarpment, select the Yes option and then provide the rise type and dimensions
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Click
Apply.
Note: The second tab of the dialog updates to reflect the Structure Type selection.
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Select the second tab and enter the structure data:
- Type the structure dimensions.
- Select the structure cross-section type (where applicable).
- Select the orientation of members exposed to wind (where applicable).
- Select the shape of exposed structural members (where applicable).
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Type the
Structure Natural Frequency.
When the natural frequency is less than 1 Hz, the structure is considered
flexible
when calculating the gust effect factor, G. When the natural frequency is greater than or equal to 1 Hz, then the structure is consideredrigid
when calculating the gust effect factor. - Type the Structure Damping Ratio.
- Select the Enclosure Classification (where applicable).
-
Select any combination of the Use Kzt,
Use Kd, Use Kz, or
Use Ke options to manually type values for
these coefficients.
The calculated coefficients are otherwise used.
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Select the
Design Pressure tab.
The height vs. intensity data calculated for the current input is displayed here.
- Optional:
You can check the options for Use G and Use Cf to manually type
values for these coefficients.
The calculated coefficients are otherwise used.
-
Click
OK.
The dialog closes and the wind intensity at height data is added to the table on the Intensity tab.
Note: The input fill will contain a section on ASCE 7 wind load
generation data. Though this is not read directly by the STAAD analysis engine,
these values are stored to allow you to make changes to the wind load
parameters.