Concrete Wall Joints and Corner Details
Concrete Wall Joints and Corner Details
(OP)
Folks,
I'm working up some typical details here and I want to open for comment. See below. I like the corner detail alright, but the joint details I'm working on are a work in progress. I've read through ACI, looked at old detail books, and thought through previous details. Really, there isn't a perfect detail for Concrete joints, as no joint is ever perfect, but I'd like to see people pick these apart and see what other folks have done that has worked well.
As always, disclaimer, these details aren't done...just a starting point for discussion, so no one use them like they are perfect.


Thanks!
I'm working up some typical details here and I want to open for comment. See below. I like the corner detail alright, but the joint details I'm working on are a work in progress. I've read through ACI, looked at old detail books, and thought through previous details. Really, there isn't a perfect detail for Concrete joints, as no joint is ever perfect, but I'd like to see people pick these apart and see what other folks have done that has worked well.
As always, disclaimer, these details aren't done...just a starting point for discussion, so no one use them like they are perfect.


Thanks!






RE: Concrete Wall Joints and Corner Details
The above images are from this thread here which talks about that corner detail a lot (much thanks KootK, great info from that post).
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Concrete Wall Joints and Corner Details
RE: Concrete Wall Joints and Corner Details
Here's also a good article from CRSI on corner joints.
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Concrete Wall Joints and Corner Details
Also, is the ACI detailing manual SP-66 worth the money?
RE: Concrete Wall Joints and Corner Details
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Concrete Wall Joints and Corner Details
This one: Link. It is, however, information intended for a very different kind of joint. We're talking plan view corners though I think.
Tough to say. There's a lot of useful stuff in there but, at your level of experience, it's likely that you'll have already acquired most of it through structural osmosis. You can check it for free online: Link
Here's what the manual has to say about corner joints. I favor the very simple top left detail as it will do for nearly all conditions. In general, what I'm looking for in these connections is:
1) A little closing joint crack control where there's dirt outside and;
2) On occasion, shear friction for shear transfer where I'm treating the wall as a composite shape (shaft walls and occasionally basements).
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete Wall Joints and Corner Details
- End your straight bars outside of the joint and use longer bent bars to form the reinforcing inside of the joint
- If you have an opening joint use hairpins from both walls into the joint - this is good up to about 90% of the wall moment capacity. If you need full ductility, provide the 45 deg bar through the joint and make sure your hairpins are small enough to be fully developed within the width of the connecting wall.
- I'd show or refer to the control joints on your corner detail. Corner restraint will cause unwanted cracking unless alleviated.
RE: Concrete Wall Joints and Corner Details
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete Wall Joints and Corner Details
Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries
www.americanconcrete.com
RE: Concrete Wall Joints and Corner Details
I think that most of the coverage in print assumes "stick built" wall cages. I'd be curious to know how prefabrication of cages would factor in, if at all.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Concrete Wall Joints and Corner Details
As an aside, I think I'm going to write a book one day, and all it's going to be is vetted quality details...because, I know that if such a book existed currently, I would buy it, and every engineer I know would buy it....
And I wouldn't put much text in there describing the basics. It would be a book that only shows abstract (IE everyday) conditions that aren't "typical". That's why Terry Malone's book on Irregular shaped structures is so good. There are 100s of books that talk diaphragms, and 1 that I know of that shows you how to deal with them when they aren't a rectangle.