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# Re: Guardrail Perforated Infill Panels

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Guardrail Perforated Infill Panels
• From: John Sieszycki <jsieszycki(--nospam--at)yahoo.com>
• Date: Tue, 16 Sep 2003 17:08:49 -0700 (PDT)

It is quite interesting problem. Infield is usually
filled at the perimeter into U-Channel frame, which is
welded to the posts and longitudinal pipes. The panel
itself will be in tension, so the stress will be well
below the metal strength. What about welds?
Everyone knows it is good enough, but how to prove it?
Similar problem is with wire mesh or expanded metal
infields. Both are kept inside the U-Channel by
friction. Has someone any calc experience with this?

John W. Sieszycki, P.E.

--- Thor Tandy <vicpeng(--nospam--at)telus.net> wrote:
> How about considering the layout of the
> perforations, identifying "strips" of good material,
> and then analyzing the material you do have in any
> direction (or both directions).  Like a large grid
> net?
>
> Thor A. Tandy P.Eng MIPENZ
> Victoria BC
> email: vicpeng(--nospam--at)telus.net
>   ----- Original Message -----
>   From: CanitzCF(--nospam--at)aol.com
>   To: seaint(--nospam--at)seaint.org
>   Sent: Monday, September 15, 2003 7:34 PM
>   Subject: Guardrail Perforated Infill Panels
>
>
>   I have a situation where perforated steel 16 gauge
> panels are specified as the infill panel for a
> stairs guardrail. The contract documents require the
> infill panel to support a prescribed design load of
> 200 lbs applied over a 1ftx1ft area. The problem is
> how to do you analyze this material? I can determine
> the geometric properties assuming a solid sheet and
> then apply a reduction factor based upon the opening
> areas but I'm wondering if this is realistic. I also
> believe that the perforated panels are not
> considered "structural" so attempting to analyze
> could be problematic. Any suggestions are
> appreciated.
>
>   TIA,
>   Charles Canitz, PE
>   Annapolis, MD

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