Forums >> Revit Structure >> Technical Support >> monolithic precast concrete staircase

kayvan

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Hi All,

I asked this question on Autodesk discussion site but no reply; that usually means there is no answers for the question but thought try my luck here anyway: 

We have a project with monolithic simple precast concrete staircase. Attached image shows a general required stairs’ profile which seems straight forward but I couldn’t make it with Revit’s stair tools in anyway. Basically the first step needs to have unique shape so each fly can be precast and install in its place. Just wondering if anyone has any advice on this?

I also attached a perspective image of stairs which demonstrate how a stair fly will mean to sit in its place.

And we use Revit 12.

Many thanks in advance.

regards      

kayvan

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WWHub

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Be aware that different areas have different architectural vocabularies.  I don't have a clue as to what a fly is here.  Is that a tread?

I don't see any different profile.  Add some sketch lines or something to be more descriptive.

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CDWdavid

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Hi Kayvan,

Should that "fly" be "flight"?

You can set the "Base Offset" one riser lower than the floor level, which will make your first step at the same elevation as the floor; then create a floor which has that gap for future infill as the landing.

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kayvan

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thanks to for your reply, as CDWDavid correctly point out; I meant flight. In any case as far as I understand your suggested trick is to set Base Offset one riser below begging slab; how does that may work? Because Revit will calculate the raiser value itself, doesn’t it?  Could you please explain your thought further?

Many thanks

Kayvan  

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CDWdavid

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Revit calculates the stair by the rules that you gave. You can set any rules you like.

Suppose that the height from the level one to level two is 10'-0", you can set the base offset as -6", and 6" for the riser, 12" for the tread, with 21 risers; then sketch 11 steps in the first flight, 10 in the second. This way the Revit will put the top of the first tread flush with level one, after you infilled that gap, you will have 20 risers, 10 in each flight.

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kayvan

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Thanks CDWdavid, that trick almost solved it for this kind of flight, however strictly speaking (from structure engineers point of view) the flight needs to have an extra bit (hatched red in attached image), would you say is there any way which that bit can be model as part of stairs?

Thanks

Kayvan 

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CDWdavid

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Hi Kayvan,

That red part will be a part of that flight, if you are using the way mentioned in my previous thread.

But the suppoting structure will be tricky now.

If the precasted stair is supported by the landing, you might have to go back to model your stair from level one to level two and set the Base Offset to 0'-0".

You may change the support landing to different profile as in attached drawing. I can see the tricky part is at the level two.

BTW, "Revit calculates the stair by the rules that you gave. You can set any rules you like." should be

"Revit calculates the stair by the rules that you gave. You can set any rules you like, but within Revit's parameters."

Sorry, that's all I can suggest. Hope that someone here can give us a better solution.

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WWHub

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I probably would not have added the tread at the floor line.  Instead, I would have had the slab come over and added an in-place or floor hosted void that cut the depression and a slab edge.

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