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RE: Yet another Wind question

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Yet another Wind question
• From: "Scott Maxwell" <smaxwell(--nospam--at)umich.edu>
• Date: Wed, 6 Feb 2008 19:03:23 -0500

```This is my thinking as well.

Regards,

Scott

-----Original Message-----
From: Josh Comfort [mailto:jcomfort(--nospam--at)ggbse.com]
Sent: Wednesday, February 06, 2008 12:35 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Yet another Wind question

The only reason I can think of is for roof members with enough tributary
area (>700 sq.ft. I believe) to qualify for MWFRS rather than C&C.

-----Original Message-----
From: Mark Johnson [mailto:markajohn(--nospam--at)yahoo.com]
Sent: Wednesday, February 06, 2008 9:05 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Yet another Wind question

That's the way I read it too.  In fact it seams like you would never use the
negative numbers in that table.  They could all be replaced with zeros.  Any
situation/reason why not?

Thanks,
MJ

-----Original Message-----
The values in the tables in Figure 6-2 are negative in zones B and D for
lower slopes.  Rather than using the negative numbers you use 0 psf when
calculating the base shear.

-----Original Message-----
From: Mark Johnson [mailto:markajohn(--nospam--at)yahoo.com]
Sent: Tuesday, February 05, 2008 2:17 PM
To: seaint(--nospam--at)seaint.org
Subject: Yet another Wind question

Here is yet another wind analysis question.
This is about MWFRS using the simplified method (Method 1) of ASCE7.
Footnote 7 of figure 6-2 (pg 37) says "The total horizontal load shall not
be less than that determined by assuming ps = 0 in zones B & D." I see that
ps30 on areas B and D are horizontal pressures.  (vertical forces on these
surfaces are calculated as areas E, F, G, & H) I can't think of a time when
you would use a pressure (ps30) on areas B & D that was less than zero and
none of my new books deal with this. What am I not thinking of?

TIA
Mark Johnson

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