Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: 85mph overhang pressures

[Subject Prev][Subject Next][Thread Prev][Thread Next]

Yeah, that’s basically the conclusion I came to as well.  Still, I am curious why 85mph is not included.

 

Thanks to everyone for their input.

 

Doug Mayer, SE

Structural Engineer

 

TaylorTeter

Partnership

 

7535 North Palm Ave., Suite 201

Fresno, CA 93711

 

(559) 437-0887 Ph.

(559) 438-7554 Fax

doug.mayer(--nospam--at)taylorteter.com

www.taylorteter.com

 

From: Andrew Kester, P.E. [mailto:akester(--nospam--at)cfl.rr.com]
Sent: Thursday, May 01, 2008 10:45 AM
To: seaint
Subject: 85mph overhang pressures

 

Doug,

 

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%

   (85)^2

 

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.
Principal/Project Manager
ADK Structural Engineering, PLLC
1510 E. Colonial Ave., Suite 301
Orlando, FL 32803


Visit our new website at www.taylorteter.com