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Canadian Concrete Design Reference

Canadian Concrete Design Reference

(OP)
Hi there,

The company I work at is looking to take on some low to mid rise concrete building projects. We are located in Canada. We have experience dealing with concrete foundations but usually do steel or wood structures above grade. I'm looking to get some resources to add to our collection before we get into the first few projects. We currently have:

- Concrete Design Handbooks (3rd Edition, with 4th coming in the mail soon)
- 2009 edition of Reinforced Concrete Design - A Practical Approach by Brzev and Pao
- Reinforced Concrete Mechanics and Design 6E by Wight and MacGregor

When I was at the ACI convention in Detroit I noticed a new book that is being put out by the CRSI Link. It seems like it might be a more practical design option in terms of actually detailing the building and providing some overall guidance on things to consider while designing. I know it would not follow the same codes but it seems like a useful resource. Can anyone comment on it's usefulness, and if there is a good Canadian alternative? Are there any other textbooks/resources that can be recommended?

Thanks.

RE: Canadian Concrete Design Reference

The ACI and CSA codes are eerily similar to each other. Therefore most references that are applicable to ACI would be quite useful for CSA projects. Specifically when it comes to detailing. Obviously you'd need to ensure that the design meets the CSA code, but I personally feel the ACI code does a better job of indicating detailing requirements.

RE: Canadian Concrete Design Reference

2
Those are some pretty solid references so you should be mostly set. I do like the CRSI stuff. I'd consider this document as well though: ACI 314. Mr. Fanella has contributed to most of the documents of this nature, including the CRSI one, and I find that it's mostly the same information. Good information... but often repeated.

The trouble with most of the concrete references is that they deal with strength and not serviceability. If your looking at modern flat plate structures etc, it mostly an exercise in long term deflection control which can be quite an exercise. To be competitive and sane, you'll need:

1) Good schematic design decisions regarding slab depths and column/wallumn layout for repetitive floors.

2) Good schematic design decisions regarding transfer slab depths and shear improvement strategies.

3) A solid strategy for evaluating long term deflections without being excessively conservative.

Some options you might consider if you don't have in house expertise:

- use us here at eng-tips as a resource. We rock.
- consider an external consultant.
- IStructE seems to have some good schematic design guides.

I've yet to actually find a design guide document that I feel adequately captures modern concrete slab practice. Columns and walls are pretty straight forward.


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: Canadian Concrete Design Reference

(OP)
jayrod12 - That's good to know. I'd be happy to work with the ACI codes and then ensure that the design still meets CSA.

KootK - Thanks for the suggestion regarding the texts. That's good to know that both of those would be similar. From reading both of the descriptions, it seems as though the CRSI manual may be a good starting place due to the examples, and then if I feel that I'm lacking info I can go for the ACI documents. Good point about the serviceability, I'll definitely keep that in mind throughout the design process. Your comment about staying competitive raises a very good point, I've been warned that these buildings usually result in maximizing unity checks (while still remaining acceptable). I imagine that will be the hardest thing to overcome during design, as the contractor building it likely already knows what slab thickness and rebar size and spacing they want. Feeling sane with the design assumptions and resulting schematic drawing is going to be a challenge.

The project we may be undertaking will likely consist of 6 above grade storeys and 2 below grade parking levels. The main floor would have a drive through area, resulting in a portion of the upper level walls being carried by a transfer slab. We'll have stacked columns and walls, and flat plate slabs, and precast balconies. I expect to have some issues with a soft storey at the main floor. We've been given site class C and a bearing capacity of 500 kPa (highest I've ever seen). I imagine I'll be leaning on Eng-Tips frequently throughout the design process, although we do know some engineers in the area that have numerous buildings like this under their belts that have agreed to provide some guidance if called upon. Thanks for the tip about IStructE, I'll have to dig through their available resources.

RE: Canadian Concrete Design Reference

(OP)
KootK - A followup question, would you recommend ACI 318 over 314? Based on my description of the proposed building in the post above would 314 cover enough material?

RE: Canadian Concrete Design Reference

I don't really see a need for 318 at all. It's a great document -- better than CSA really -- but CSA should be all that you need in terms of code for a Canadian project. I also would not consider 314 to fully cover all that you would need to know. As I mentioned previously, I've yet to see a suitable stand alone reference that I feel covers all of the bases in that regard. I attached an article on slab deflections that you may find interesting.

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: Canadian Concrete Design Reference

(OP)
Thanks very much KootK. That article was an interesting read, especially the figure at the end. I'm hoping that once I get into the design I can make some reasonable estimate for long term deflections.

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