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85mph overhang pressures[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "seaint" <seaint(--nospam--at)seaint.org>
- Subject: 85mph overhang pressures
- From: "Andrew Kester, P.E." <akester(--nospam--at)cfl.rr.com>
- Date: Thu, 1 May 2008 13:44:44 -0400
As someone else said, pressure is a function of V^2.
So if my math is correct, the difference between 85mph and 90mph:
(90)^2-(85)^2 x 100% = 12%
Now a 12% increase in overhang uplift in my opinion affects nothing. So you end up MAYBE with a slightly larger uplift strap. Great, that is the weakest point of the structure and money well spent. Since straps are less than a buck anyway for the most part. I have seen lots of roof and structural failures that started with the uplift strap.
I would use 90mph and rock on.
Andrew Kester, P.E.
ADK Structural Engineering, PLLC
1510 E. Colonial Ave., Suite 301
Orlando, FL 32803
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