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ACI-318 11 Section interpretation (SEC. 8.3.3) 1

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ENGR_2321

Structural
May 9, 2017
35
Hello. i am reading this section and just need clarification on section 8.3.3 part (b) that says " spans are approximately equal with the larger of 2 adjacent spans not greater than the shorter by more than 20% " . So for example having a 7 ft and 12 ft . How would I compute this? I just want to make sure. I know it's simple math but I don't remember how to do this. Thanks!
 
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In the context of your example I believe that the criterion would be:

12'/7' = 1.71 > 1.20 therefore NG.

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.
 
1.2 = (100% + 20%) / 100%. Perhaps you'd prefer it this way:

(12'/7' -1) x 100 = 71% > 20% therefore NG.

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.
 
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