Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Joints in retaining walls

[Subject Prev][Subject Next][Thread Prev][Thread Next]

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)]
Sent: Wednesday, March 22, 2006 4:41 AM
To: seaint(--nospam--at)
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.


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!


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

The information contained in the e-Mail, including any accompanying documents or attachments, is from Moffatt & Nichol and is intended only for the use of the individual or entity named above, and is privileged and confidential. If you are not the intended recipient, be aware that any disclosure, dissemination, distribution, copying or use of the contents of this message is strictly prohibited. If you received this message in error, please notify us.