Design Wind Pressure for Architectural Perforated Panels 1

[muchtolearn]

thread507-378806
Working on design of some perforated architectural wall panels enclosing a parking garage podium for a high rise structure and trying to determine whether the design wind pressure per ASCE 7 can be reduced based on the percent open area. ASCE 7 doesn't really address the issue - the closest I could find was 30.1.5, but that section essentially avoids the issue and references "approved test data or recognized literature".

I understand that this is a complex phenomenon given drag and aerodynamic effects for various hole patterns, but this is also a very common application in building envelope applications so I would think that there must be some resources or information out there to provide more guidance. I have reviewed the IPA Perforated Metals Handbook - it was useful for determining reduced E and S values based on percent open area, but does not address design wind pressures very well.

I also came across the thread noted in the subject line - Trenno noted that Australian codes allow a reduction in wind pressure, but did not provide a direct reference for that information. Does anyone know where that may be found? I have been searching for it online, but no luck so far...

 

[Settingsun]

Hi,
Trenno was referring to Australian/New Zealand Standard AS/NZS 1170.2:2011 "Structural Design Actions Part 2: Wind Actions". In clause D1.4 it gives the net porosity factor (Kp) for freestanding hoardings and walls as:

Kp = 1 - (1 - delta)^2, where delta is the solidity ratio = solid area/total area.

 

[dik]

Good information to know...

Dik

 

[Trenno]

Thanks Steveh,

One thing to also consider is... will there come a time in 10 years where they replace the perforated panels with solid panels? Perhaps use the Kp factor as a 'nice to have.'

 

[thaidavid40]

Or someone decides to hang a huge canvas advertising banner across those perforated panels, and there goes your porosity factor!
Dave

Thaidavid

 

[muchtolearn]

Perfect! Thanks to all for the input!