Column strip width ACI-318-08 13.2.1

[Geocito]

"Column strip is a design strip with a width on
each side of a column centerline equal to 0.25xl2 or
0.25xl1, whichever is less."

¿What happens when L1 is shorter than L2 but L1 is not equal in successive spans? ¿Should I use variable column strip width? In this case, ¿what would be the width of the negative reinforcement on the column?

 

[hokie66]

If there is only a minor variation in the spans, say 20% or less, I would make the column strip width equal to 1/2 the shorter span and carry that width right through.

 

[JAE]

This reveals the reason why irregular bays are not the best for two way slab systems. Not to say they don't work - just makes the Direct Design or Equivalent Frame approach less "reasonable".