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Re: Joints in retaining walls

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Most interesting is to see a nice joint -- with a crack several inches away and parallel to it!  In slab or wall.  Kind of makes me wonder how deep the joint is; perhaps it's just cosmetic.

Ralph

In a message dated 3/22/06 4:37:50 AM, kspeoples(--nospam--at)lvta.net writes:

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 -----
From: Rhkratzse(--nospam--at)aol.com
To: gloomis(--nospam--at)MasterEngineersinc.com ; seaint(--nospam--at)seaint.org
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