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RE: Wind Load Net Pressure vs. Design Load Case

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Okay, let me clarify what's bugging me about interpreting this.

You state here - and I agree - that you come up with "magnitudes of 
pressures applied to each surface" which includes the windward, leeward, 
and side walls, and the roof, as illustrated in Fig. 6-6/27.4-1.

So for example typically you're going to have a varying pressure on the 
windward face calculated from q-sub-z*G*C-sub-p, and uniform pressures on 
the other three walls from q-sub-h*G*C-sub-p, and a pressure profile on the 
 roof similarly.

But then when you go to Fig. 6-9/27.4-8, and look at CASE 1 it illustrates 
pressures on windward and leeward walls ONLY, and in fact Note 3. of that 
figure explicitly calls those "Windward/Leeward face design pressures". So 
where are the pressures on the roof and the side walls in that 
illustration? Okay, I guess the side walls cancel each other out. But what 
about the roof load? Do you take for example the roof loads in each 
direction, and ADD them together for CASES 3 and 4 (multiplied by their 
respective reduction coefficients in each CASE)?

I guess that's a reasonable interpretation, but wouldn't it help if they'd 
just explicitly say so, perhaps in the Notes on Fig. 6-9/27.4-8?

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Joel Adair Sent: Thursday, January 16, 2014 4:23 PM
To: seaint-seaosc(--nospam--at)
Subject: RE: [SEAINT-SEAOSC] Wind Load Net Pressure vs. Design Load Case

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:

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