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RE: Wind Load Net Pressure vs. Design Load Case

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The way I understand it, Figure 6-6 is used to determine the magnitude of 
the pressures that are applied to each surface -- windward wall/roof, 
leeward wall/roof, and side walls.  Then, Figure 6-9 is used to determine 
which surfaces are loaded simultaneously to create the maximum design 
loading for the various wind cases -- orthogonal wind, quartering wind, and 
 wind with eccentricity.

-- Joel

the structural alliance
Joel Adair, PE, LEED AP

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Polhemus, William Sent: Thursday, January 16, 2014 3:43 PM
To: seaint-seaosc(--nospam--at)
Subject: [SEAINT-SEAOSC] Wind Load Net Pressure vs. Design Load Case

Regarding calculation of loads on "buildings of all heights" for wind:

In ASCE 7-05 you have Figures 6-6 (External Pressure Coefficients, Cp) and
6-9 (Design Wind Load Cases).

The corresponding Figures in ASCE 7-10 are 27.4-1 and 27.4-8 respectively.

(The Figures and their accompanying notes appear to me to be the same in 
either version of ASCE 7 except for the Figure designation).

>From what I can tell reading both versions of the standard, the two are 
supposed to work together somehow, yet the way they have the Figures drawn 
almost seems that they are intended to be "either-or": EITHER you use the 
pressures on the walls and roof of your building as shown in Fig. 
6-6/27.4-1 OR you apply the pressures to windward and leeward surfaces ONLY 
 per Fig. 6-9/27.4-8.

Has anyone managed to decipher this to your satisfaction?

William L. Polhemus, Jr. P.E.

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