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# Re: Glass guardrail support

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Glass guardrail support
• From: canitzcf(--nospam--at)aol.com
• Date: Mon, 07 Jan 2008 14:16:13 -0500

Joe -
Buried somewhere at home. I have glass rail calc's (prepared by Braun or Blum?). I believe the calc's were based upon a scenario similar to your situation.

I believe that the "S" used in these calculations was based upon (2*h*t^2)/6 where h is the glass height and t equals the glass thickness.

Since the member's effective width was assumed to be twice it's height, distributing the 200 lb load over a width equal to it's height along the base would not be unreasonable.

I'll forward these calc's if I can locate.

Thanks,
Charles Canitz

-----Original Message-----
From: Joseph R. Grill <jrgrill(--nospam--at)cableone.net>
To: seaint(--nospam--at)seaint.org
Sent: Mon, 7 Jan 2008 12:37 pm
Subject: Re: Glass guardrail support

Paul,
This is very similar to my situation except the glass is embedded in a "metal" shoe which is then attached to the structure.  It will have a metal rail at the top.  I'm trying to come up with a "reasonable" distribution of the 200# load at the connection of the shoe to the structure.
Joe

"Last time I checked an all glass guard system, the glass was grouted into a deep shoe at the base and the Aluminum handrail was used to help distribute the horizontal forces along the top of the glass.  I was there during construction and the glass panels stiffened up a lot when the hand rail was attached."
----- Original Message -----
From: Paul Blomberg
Sent: Monday, January 07, 2008 10:01 AM
Subject: Re: Glass guardrail support

I don't know if it is current but ASTM E985-96 "Permanent Metal Railing Systems and Rails for Buildings" has reference to static loads and deflections during testing iaw E894 and E935.  Max. allowable deflection:
For horizontal load at mid-span:  h/24 + L/96
For horizontal load at top of post (I know, all glass, no posts):  h/12
For vertical load at mid span:  L/96

Perhaps this criteria would also apply to your glass system.

Last time I checked an all glass guard system, the glass was grouted into a deep shoe at the base and the Aluminum handrail was used to help distribute the horizontal forces along the top of the glass.  I was there during construction and the glass panels stiffened up a lot when the hand rail was attached.

Paul.
Phoenix, AZ

-----Original Message-----
From: Jeff Smith [mailto: jeffsmith7(--nospam--at)comcast.net]
Sent: Friday, January 04, 2008 4:47 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Glass guardrail support

Do hand rails, glass or otherwise, have deflection requirements? I have never found it, but I prefer something very solid.

Jeff

From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Friday, January 04, 2008 2:40 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Glass guardrail support

Back in years gone by we simply required the guard rails to be tested after they were installed.  I was amazed how much glass could bend, but they performed well, and I slept well.

Regards,
Harold Sprague

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