Need a book? Engineering books recommendations...
Re: Shrinkage of Concrete Floodwall[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "Seaint" <seaint(--nospam--at)seaint.org>
- Subject: Re: Shrinkage of Concrete Floodwall
- From: "SGE Structural" <sgordin(--nospam--at)sgeconsulting.com>
- Date: Sat, 27 Jun 2009 20:20:14 -0700
The amount of water lost through say, 1/16" wide cracks at certain spacing at the time of flooding (water 2-3 ft above the top of levee) can be relatively easily estimated (I've done it recently). It is likely to be minor, comparable to amount of seepage through the levee and to the amount of rain attributable to the ground outside the wall. From this perspective, cracking of the wall does not appear to have any significant effect on "hundreds of homes."
Whatever your crack-related solution may be (including doing nothing), cracking of the concrete wall due to thermal expansion does not look like a huge problem for "hundreds of houses." The 20-ft joint spacing appears as good as anything else - justifiable, for example, by PCA "Rectangular Concrete Tanks" Figure 1-2 (#4@12" each face, they recommend smaller rebars at smaller spacing for thermal/shrinkage).
I would be more concerned about cracking due to settlement and seepage under the wall foundation (with its subsequent undermining and further settlement). But this is a totally different issue.
Have a great weekend,
V. Steve Gordin,
Registered Structural & Civil Engineer
P.S. I want to thank Matthew Stuart and you, Stan, for bringing the issue of elections to this list. Without your input - as bothersome as it originally seemed to be :) - I would have never gone to the ASCE website, read whatever was available there about the two candidates, and voted. Great idea, good job. SG
- Prev by Subject: Re: Shrinkage of Concrete Floodwall
- Next by Subject: Simple Shear tab connection
- Previous by thread: Re: Shrinkage of Concrete Floodwall
- Next by thread: Stainless Steel