You raised a very good point.
I contacted Mr. Basile Rabbat with PCA for an interpretation on this issue.
His opinion is that if you end up with different size bars in adjacent
spans, you can splice the two bars beyond the column line of the longer
span, with proper splice length for the larger bar. He definitely does not
think that you need to carry the largest bar for the entire length of the
By the way his phone number is 847-966-6200.
Hope this helps.
From: ASLCSE(--nospam--at)aol.com [SMTP:ASLCSE(--nospam--at)aol.com]
Sent: Saturday, May 08, 1999 10:27 AM
Subject: Re: FLAT SLAB REINFORCEMENT REQUIREMENT
In a message dated 5/4/99 6:25:38 PM Pacific Daylight Time,
> have a question about the '97 UBC requiring that positive moment
> reinforcement be continuous in all column strips (bottom bars).
> UBC allowed 50% of the bars to be cut-off, the '97 does not. I
> it up in ACI 318-95 and found figure 13.3.8 to show the same
> the '97 UBC. The reasoning behind this was to provide a way for
> load to redistribute to adjacent columns in the case of a single
> punching shear failure. So I take this as saying I need to
> bottom bars through regardless of the different span lengths?
> seems too conservative...?
> Any help or clarification would be appreciated.
> David Taquino, EIT
> Libby Engineers, Inc.
> San Diego, CA
I think it is a good insurance.....
Antonio S. Luisoni