Wednesday, July 18, 2007

Re: Backstop Design

Jordan,
 
    Pure cantilevers .............. but, I figured it out.  I have been using Af as the total backstop area, not the area of the mesh, verticals, and horizontals.  HUGE difference.
 
Brian
----- Original Message -----
Sent: Wednesday, July 18, 2007 9:32 AM
Subject: Re: Backstop Design

Are you considering the posts as pure cantilevers, or are you taking the frame action into account?
Jordan


Brian K. Smith wrote:

    I am in the process of designing a backstop for a high school athletic
field.  100mph wind loading, 27'-5" high.  I determined my wind pressures
using ASCE 7, assuming an epsilon of 0.192 (2x2 6 ga. mesh).  My average
wind pressure (total force over area) came out to be around 17.7 psf, which
for a cantilevered 27.5' post at 8' or 10' is huge.  I was originally
assuming I would have 4" diameter schedule 40 post at 10' on center; but now
I'm coming up with 8" A53 pipe at 8' on center.  Am I missing something?




Brian K. Smith, P.E.
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