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RE: Wind[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Wind
- From: "Ehrlich, Gary" <gehrlich(--nospam--at)nahb.com>
- Date: Fri, 16 Jan 2009 08:57:25 -0500
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.
the 2009 International Builders' Show
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.
B.Tech (mfg & mech), MIIE, gradTIEAust
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- From: Doug Mayer
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