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Re: Minimum Slab Reinforcing

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But that doesn't refer to 10.5.4 where the 0.0018*Ag shows up.

On Thu, Sep 4, 2008 at 3:26 PM, Scott, William N <William.N.Scott(--nospam--at)> wrote:
Years ago, Kris showed me Paragraph 10.5.3. "The requirements of 10.5.1 and 10.5.2 need not be applied if at every section As provided is atleast 1/3rd greater than that required by analysis."
I've used this provision in slabs to keep the tension reinforcing reasonable.
Bill Scott

From: Josh Plummer [mailto:joshp(--nospam--at)]
Sent: Thursday, September 04, 2008 10:29 AM
To: seaint(--nospam--at)
Subject: Minimum Slab Reinforcing

In ACI 318, section 10.5.4, the code states that the minimum flexural reinforcement for slabs and footings should be the same as given in 7.12 (which is the temperature / shrinkage requirements). 


I've interpreted this to me that regardless of what the area of steel required by analysis is, you can never let your total slab reinforcing (As_top + As_bottom) be less than the minimum amount required for temperature and shrinkage. 


Now, I've got another engineer who is arguing that the Asmin = 0.0018 * Agross requirement applies for BOTH the top steel reinforcing and the bottom steel reinforcing.  Since temperature and shrinkage controls the design of most relatively thick mat foundations, this interpretation would effectively double the amount of steel required in these mats. 


Any opinions?  Has anyone heard of someone interpreting this section of code in this manner? Is it common? 




Josh Plummer, SE