Slab + Cantlevers options?

[scowsert]

So I draw a slab and pick a sketch line I have two cantilever options. Concrete which I understand it just gives more concrete and less deck. What does Steel do? Do you have a screen shot of it in use. I can't seem to make it do anything.

Thanks.

[benmay]

The steel option is only available when you have a floor with a decking profile, but what it does is very different to the concrete option

I believe concrete will actually increase or decrease the slab edge position as a cantilever (or negative cantilever?Its not really a cantilever if its minus a length!), and the steel option will just adjust the decking layer.

See attached for a 300 steel cantilever

[jcharpentier]

If you have RST 2009, the help section on cantilevers is much improved.

Check it out, it should answer your questions.

[troberts]

I have a 6 1/4" slab on composite deck. I am trying to cantilever the slab 1'-4" beyond the centerline of the beam. Revit says the cantilever is too big and it will not do it.I am the engineer, not Revit. I have an edge form and I have top reinforcing. What do I have to do to have Revit allow me to do this cantilever?

[nick.205094]

I have a 6 1/4" slab on composite deck. I am trying to cantilever the slab 1'-4" beyond the centerline of the beam. Revit says the cantilever is too big and it will not do it.I am the engineer, not Revit. I have an edge form and I have top reinforcing. What do I have to do to have Revit allow me to do this cantilever?

This has been a very frustrating problem with me as well. I have a very complicated building with a limestone exterior which moves in and out in plan quite a lot. We are using the slab edge to provide support for a brick relief angle, so it extends quite far past the spandrel beam. I also am providing a bent plate and reinforcement in the slab.

But alas, Ive found revit will not allow me to use the cantilever command to extend the slab past the beam more then 6" (or 8" I can't seem to find a consistent behaviour). I have drawn the slab perimeter where it needs to be (it will allow you to place a slab anywhere, only the cantilever command wants to be a designer...). When I cut a section I just draw over the deck profile with a concrete hatch and "fudge" the cantilever.

Anyone have any thoughts about this? While the help file in RST 2009 is good, it doesn't explain the limits of the tool.

Thanks!

[djn]

We have come to the conclusion that the cantilevered edge to works OK for straight runs, but if you concrete steps in and out it doesn't work well. With that said I ran some tests and found that if I just have a straight run I can cantilever the slab as far as I want. If I model a slab edge with with multiple lines and different cantilever values I get the error message "Cantilever Value to Large" . Looks like you can't have values different values next to each other. Revit doesn't know how to create the return.

[ylee_one-14]

We have run into the same issues. We simply model the cantivers as seperate slabs and omit them when we analyz.