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RE: Arena Guardrail Deflections

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I think it is O.K. because the guardrail will resist the load gradually.  By this, I mean it will push back when people push against it and that will give "confidence". 

 

Here's where I'm coming from:  I designed a guardrail that had to be removable, so we set it in pipe sockets.  The sockets allowed only 3/8" movement at the top of the guardrail.  But that deflection would occur instantly as someone would lean against the guardrail.  And the person had no idea that guardrail motion would stop at 3/8" so quiet a few people thought they were going over the side.  Not good - we had to shim it to eliminate all "slop".

 

Bob Garner

 


From: Thor Tandy [mailto:vicpeng(--nospam--at)telus.net]
Sent: Monday, April 06, 2009 9:35 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Arena Guardrail Deflections

 

Post – HS 2.5x2.5x.25 @ 3’-10.5” o.c.  Hgt = 42”

 

Top rail HS 2x1x3/16

 

Total deflection post (7/16”) + midpoint top rail (1/8”)  = 9/16”

 

All this under a UDL of 206plf (3kN/m)  Under “normal” guard rail loads (1kN at top of post) the defl = 3/16”

 

My question is, “Even though strong enough, would this be “robust” enough?”  It’s a perception thing …

 

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

 

From: Alex Nacionales [mailto:alex1961(--nospam--at)telus.net]
Sent: Monday, April 06, 2009 9:17 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Arena Guardrail Deflections

 

Thor,

 

    What is the post spacing, thickness of tube and will the tube be placed vertically or horizontally? Is the deflection at the post location or at midspan of top rail?

 

 

Alex Nacionales

 


From: Thor Tandy [mailto:vicpeng(--nospam--at)telus.net]
Sent: Monday, April 06, 2009 8:48 AM
To: SEAINT (SEAINT)
Subject: Arena Guardrail Deflections

 

I’m checking a guard rail in an assembly/egress location.  The section proposed gives a total deflection of post + top rail of about 14mm (9/16”) of the post hgt of 1070mm (42”).

 

For an assembly area this still seems a bit high. 

 

Also my client is proposing a top rail 1”x2” tube …

 

What do you think?

 

TIA

 

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