Differing Beam Widths

[AggieYank]

When designing a continuous run of beams, 1 beam is required to be (for example) 18 inches wider than the other beams in that same continuous run of beams. What is the common procedure for detailing the negative moment at each end of the wider beam.

-Make .25 of the length of the beams on either side of the wider beam the width of the wider beam?
-Run the negative reinforcing (top steel) into the slab on either side of the wider beam (where the steel can't run into the adjacent beam)?
-Some other solution.

Thanks a lot.

 

[JAE]

We've always just run the top steel into the slab, even if it is beyond the sidewalls of the thinner beam. To widen a portion of the length of the thinner beam - that would add excessive cost that is not warranted. And I've never ever seen that done for that purpose.

Now be careful, though, as your negative moment design should be based on b = the smaller web width, not the larger. Also include the difference in width in your analysis of the continuous beam.