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Concrete slender wall design

Concrete slender wall design

Concrete slender wall design

(OP)
Does anyone have insight as to why ACI 14.8.2.4 exists?  Why are we trying to reinforce a wall to prevent cracking?This seems to contradict the rest of 14.8, where deflections are a function of Icr.  There is no commentary given on this.  

RE: Concrete slender wall design

Leakage control perhaps.

RE: Concrete slender wall design

Also, most of the slenerwall designs were tilt-up, cast with the outside, architectural reveal face down, subjecting that face to high tension stresses from lifting.  Hence the need for better crack control.  

I have seen too many concrete tilt projects with crack problems from lifting over the years.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Concrete slender wall design

ACI 14.8.2.4 just requires the bending capacity to be greater than the cracking moment, which is a typical requirement for all flexural sections.  If the bending capacity when cracked is less than the cracking moment, failure would be brittle.

The reinforcement doesn't prevent cracking, but rather provides a reliable moment capacity after cracking occurs.

RE: Concrete slender wall design

I can't say it any better than hokie just did.

BA

RE: Concrete slender wall design

(OP)
Thanks all for your input.  I see now that it is possible for Mcr to be greater than phiMn when you have a small d, such as one mat of rebar centered in a wall.

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