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RE: Wind

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Gary & Conrad,

 

Thanks for the input. 

 

Doug Mayer, SE

 

From: Ehrlich, Gary [mailto:gehrlich(--nospam--at)nahb.com]
Sent: Friday, January 16, 2009 5:57 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Wind

 

Doug & Conrad,

 

I did not see anything in a quick scan of ASCE 7-05 (provisions or commentary). However, the Wind Load Subcommittee is working on new language that would implement what Conrad said, i.e. use the same C&C wind pressure as for the adjacent wall surface. There is a paper from Peter Vickery in the May 2008 ASCE Journal of Structural Engineering that provides the necessary supporting data.

 

Gary

Gary J. Ehrlich, PE
Program Manager, Structural Codes & Standards
National Association of Home Builders (NAHB)
1201 15th Street, NW, Washington, DC 20005
ph: 202-266-8545  or 800-368-5242 x8545
fax: 202-266-8369
gehrlich(--nospam--at)nahb.com

Attend the 2009 International Builders' Show
January 20-23, 2009, Las Vegas, NV
www.BuildersShow.com

 

From: Conrad Harrison [mailto:sch.tectonic(--nospam--at)bigpond.com]
Sent: Thursday, January 15, 2009 7:11 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Wind

 

Doug,

 

Typically the wind on the underside of an eaves overhang equals that on the adjacent wall surface. For example from ASCE7-05 Fig6-6 Cp=+0.8 for the windward wall, so soffit would experience Cp=+0.8 (upwards), whilst sidewalls experience Cp=-0.7 (downwards), and leeward Cp=-0.5(max. mag.) (downwards). Adopt similar approach for C&C pressures.

 

Not sure where rule is in ASCE7 but it is the approach used to AS1170.2, and I recollect something in commentary to ASCE7-05.

 

 

Regards

Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust

mailto:sch.tectonic(--nospam--at)bigpond.com

Adelaide

South Australia