02g. "Wind" - AutoPIPE Load Case

Comments Questions and Answers about Wind loads

Item #1: Comment 

The Load> Wind command enables the user to define static wind load cases (W1 - W10) by generating wind pressure:

Vs. Profile piping height profiles

Per ASCE 7 1998, 2002, 2010, or 2016 code

Per Uniform Building Code (UBC) requirements.

After specifying a new wind load case, select the first cell in the left column to highlight the row and press the Modify button to see more settings for the specified Wind Load Type as indicated below:

The wind force is applied as uniform loads in the local coordinate system of the straight pipe or bend element. The equivalent wind force is assumed to act through the centroid of the element.

Wind loads will only be applied to piping if both conditions are meet:

1. segments that have "Applied Wind" checked on. I

2. Wind load case must be enabled inside of an analysis set:

Segment Tab on the input grids:

Load> Static Analysis Sets> modify analysis set:

Item #2: Comment

AutoPIPE and higher: Wind loads defined in the model can be applied to structural members.

AutoPIPE 11.01.xx and lower: Beam members are not subjected to wind loads, enhancement has been logged, (135281).

Item #3: Comment

In order to exclude piping inside a building from wind loads, the piping inside should be entered as a separate segment(s) from the piping outside the building. 

Segment Tab on the input grids:

With the model Input grid opened, select the Segment tab, see column labeled "Apply Wind". Segments with Applied Wind  enabled are considered outside, while segments with Apply disabled are considered inside.

Item #4: Nonlinear wind load analysis

Item #5: Ground elevation

Item #6: Input a Wind profile using Wind Velocity instead of Wind Pressure

Item #7: Account for East and West wind in both +ve and -ve directions

Item #8: Off global axis wind loading for FPSO / off shore platform

Item #9: Should the Wind Shape Factor Multiplier for ASCE wind specification

Item #10: Apply the same wind speed to entire model

Item #11: Pipe movement be greater than the support gap setting for wind load combinations

Item #12: Wind profile basic pressure (i.e. acting on a plate) value

Item #13: Annual probability for wind loading

Item #14: Apply friction only for expansion combinations and not occasional Wind loads combinations

Item #15: Area used for wind/wave force calculations

Item #16: ASCE 7 Wind speeds

Item #17:

The following only affects AutoPIPE V8i and will be fixed in the next new version 09.06.01.xx and higher:

The Ground Elevation for Wind is always entered in Feet, regardless of the model units file specified on Tools> Model Options> General dialog . This can be confirmed with the Loads Summary Data Listing report using any metric units file (CAE-TR-11097).

Item #18: Appears wind load is not applied in analysis calculation

Item #19: Wind direction Dx, Dy, Dz values change on the Wind Profile dialog

Item #20: ASCE7 - 2010 Wind loads: Service or Ultimate loads?

Item #21: Model Wind Sway On A Pipe Rack

Item #22: Convert wind loads from MPH to PSF

Item #23: ASCE 7, wind load setting "Cf" value when defined as Automatic

Item #24: ASCE 7, basic wind speed assumed to be sustained or a gust ?

Item #25: Apply Wind load to constant spring support

Item #26: ASCE 7-10, Kd term missing

Item #27: Options to apply wind to pipe on a Vessel / tower

See Also

Loads and Load Sets - AutoPIPE

Bentley AutoPIPE