ACI 447R-18: Design Guide for Twisting Moments in Slabs - New Document 2

[Ingenuity]

As the subject states, ACI just issued a new report/guide (37 pp) on twisting moments in slabs, dated April 2018.

For those who are ACI members, the document is freely accessible through the "ACI Collection" series via web view or a secured-PDF download: Link

The document goes over various design methods, including Wood & Armer, neglecting twisting, sandwich model, element nodal forces, etc.

FULL DISCLOSURE: I am not associated with ACI, I just wanted to pass this info on to E-T members, as the subject often comes up here.

 

[KootK]

I'll have to buy this as a one off if I want it. Can you comment on the degree of awesomeness? Anything in there that:

1) Could be of practical use in design or;

2) Would help make me feel superior to the unwashed masses if I knew it?

Those are my two litmus tests for whether or not a new pub is worthwhile.



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.

 

[WARose]

Thanks for the tip Ingenuity. Will have to get. (Don't see it in ACI's store yet though.)

 

[Ingenuity]

Sorry, I have not read it yet. May get a chance this coming weekend.

Some initial observations:

It does have some pretty color graphics!

Fair to say, given the subject matter, that is more "theoretical" than "practical/design" orientated. There are no real-world, fully-worked, numerical examples, EXCEPT is does compare the 6 stated design approach to each other in a numeric table/s.

...and it does have two "extra-credit" chapter, one on 2-way walls, and one on shells. I blew right past that!

I was expecting a dedicated report on two-way slabs ONLY, with solid theoretical (albeit brief) background info, with some numeric comparisons. Dissapointed on first pass. My opinin may change when I read the content. Sorry to be "judging a book by its cover".

 

[KootK]

My recent experiences designing precast hollow core planks have given me a whole new appreciation for the twisting capacity of CIP slabs. After your zillion-th CIP slab, you just kinda stop thinking about it. But you sure do miss that "other direction" flexural capacity when she's gone...

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.

 

[TehMightyEngineer]

Let me know when you do finish reading it Ingenuity, I'm on the fence about getting this publication as well.

Ian Riley, PE, SE
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/