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RE: Joints in retaining walls

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I've seen this too.  I no longer put joints in my walls.  I just space the pvc sleeves for the railing at wherever I want a relief crack to appear.  I studied one such wall for a period after construction; the crack started at the sleeve at the top of the wall and over about a month, extended down the wall, nice and straight, pretty as any control joint.

 

Bob Garner

 


From: Ken Peoples [mailto:kspeoples(--nospam--at)lvta.net]
Sent: Wednesday, March 22, 2006 4:41 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Joints in retaining walls

 

I too have seen similar cracks at inserts - even at walls with joints.  I have often wondered whether it would be better to require core drilling for the railing posts and force the shrinkage to occur more at the joints. 

 

Best regards,

 


Kenneth S. Peoples, P. E.

 

LVTA
Lehigh Valley Technical Associates, Inc.
1584 Weaversville Road
Northampton, PA 18067

 

Phone: 610-262-6345
Fax: 610-262-8188

----- Original Message -----

Sent: Tuesday, March 21, 2006 4:50 PM

Subject: Re: Joints in retaining walls

 

FWIW I once saw a cast concrete site retaining wall (i.e. not a building wall) somewhere in California, about 6' or 7' tall, with a fine, full-height vertical crack every 10', aligned with the inserts for a metal railing.  Not a "real" joint in sight!

Ralph

In a message dated 3/21/06 1:41:03 PM, gloomis(--nospam--at)MasterEngineersinc.com writes:


CRSI Design Handbook - Working Stress Design 1963 recommends contraction
joints at about 25' and expansion joints at every 4th joint - 100'.  The
newer CRSI 1996 states the same recommendations and also references
Figure 14-5 which is based on ACI 350.

Gary Loomis

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