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RE: Glass guardrail support

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... which should encourage acceptance of a top rail as an unquestionable requirement ...

Thor A. Tandy P.Eng, MIStructE, Struct Eng
Victoria, BC

-----Original Message-----
From: Steve Gordin [mailto:sgordin(--nospam--at)]
Sent: Monday, January 14, 2008 7:19 AM
To: seaint(--nospam--at)
Subject: Re: Glass guardrail support

For distribution, you may want to look into Timoshenko's Plates and Shells, page 218.  Essentially, for a cantilevering plate, is comes to the intuitive 45-degree distribution to the base.   
Much more importantly, you may want to verify if your arrangement is compliant with the requirements of IBC 2407.1.2.
I investigated a situation when a guard panel supported on 3 edges (not cantilevering) failed,  leaving a dangerous hole in the second-floor gallery.     
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
Sent: Friday, January 04, 2008 15:01
Subject: Re: Glass guardrail support

I'm sorry, I may not have been clear.  There are no posts.  There is only a panel of glass 3' high x length of protection required.  The panel is cantilevered from it's base.  The distribution would not be through a top rail / post system, only through the cantilevered glass panel itself.
Any Clearer?
Joe grill
----- -----Original Message-----
From: Joseph R. Grill [mailto:jrgrill(--nospam--at)]
Sent: Friday, January 04, 2008 1:02 PM
To: seaint(--nospam--at)
Subject: Glass guardrail support

I am looking at the support system for a guard rail system.  The system is pre-manufactured and only the attachment to the structure needs to be designed.  It is a guard in a residence and I am told will be 36" high.  I also understand that per IBC 1607.1 that I only need to consider the 200# load requirement.  The glass panels are wide (from what I am told, they are the full width of the opening they serve with no intermediate vertical non-glass members.
I am wondering if there is some distribution of the 200# concentrated load that can be taken from the top of the guard to the support attachment?  with a 36" high guard can the 200# load be distributed over, say 3 ft? or maybe something other 2ft?, 6ft?  A distribution would make my attachment to the substructure much easier since it is a wood substructure.
Joe Grill