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Thread: Monolithic Concrete Stairs

  1. #1
    All AUGI, all the time Arnel Aguel's Avatar
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    I'm trying to create a monolithic concrete stairs following this tutorial http://usa.autodesk.com/adsk/servlet...112&id=3027322 however i'm not sure if it is just me or there is really a little bit of a problem with the tutorial. If you follow exactly the tutorial the upper end of the stairs will leave a gap from the upper level boundary of the stairs. If you set the Riser Type back to straight or incline instead of none it will also give you a very thin riser at the top most part. Any idea guys?

    BTW, my requirement is actually a U shaped monolithic concrete stairs. I did try creating one following the above tutorial but it gives me an error message "A piece of boundary is too short to create a boundary on it".

    I'm confused which part it is referring to.

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    100 Club studioCJF's Avatar
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    Default Re: Monolithic Concrete Stairs

    Arnel

    I had lots of trouble with monolithic stairs using the tutorial sequence.
    I think it works fine for simple straight run stairs. but my problem was that mt monumental stair is "L" shaped with the treads of the stairs on the short leg twice as deep as those on the long leg. The stairs on the long leg are a typical 7"/11" riser/tread but the stairs on the short leg are 7"/22" riser/tread. (you know the kind of stairs that are hard to walk on because your rythm is all screwed up). I tried making two stairs that mitered in the corner but with slanted risers the miter is close but not good enough for me...long story short now both legs of the"L" are the same.

    I still wouldn't mind figureing that one out for the future though.

    Clark
    (see attached this is from part of my very first and only revit project)
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    Super Moderator beegee's Avatar
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    Default Re: Monolithic Concrete Stairs

    Quote Originally Posted by Arnel Aguel
    If you set the Riser Type back to straight or incline instead of none it will also give you a very thin riser at the top most part. Any idea guys?
    The riser type must be set to "None" for monolithic stairs. Use the align tool to align the upper edge of the stair with the upper slab edge. Note that for other stair types, the top tread is the floor edge of the level above. The last riser ends at the floor level.

    To create a U shaped stair, firstly create a "dogleg" then edit it by deleting the bottom riser at the landing and add a riser at the top of the final flight. Fix the boundaries, to maintain a closed loop. Delete the outside landing edge and constuct an arc.
    Bruce Gow.

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    All AUGI, all the time Arnel Aguel's Avatar
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    Default Re: Monolithic Concrete Stairs

    Quote Originally Posted by beegee
    The riser type must be set to "None" for monolithic stairs. Use the align tool to align the upper edge of the stair with the upper slab edge. Note that for other stair types, the top tread is the floor edge of the level above. The last riser ends at the floor level.
    Beegee it won't work. After setting the riser type to none as per the tutorial and as what i've said it will leave a gap from the upper level boundary using align tool will not work. It will not move the stairs to align to the upper boundary.

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    Super Moderator beegee's Avatar
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    Default Re: Monolithic Concrete Stairs

    Arnel,

    Can you copy the file, purge, delete all other stuff etc and post it ?
    Bruce Gow.

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    All AUGI, all the time Arnel Aguel's Avatar
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    Default Re: Monolithic Concrete Stairs

    I just made a simple one for review.

    Here is the file.
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    Super Moderator beegee's Avatar
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    Default Re: Monolithic Concrete Stairs

    Arnel,

    The gap you're seeing is because the top tread of all stairs is the floor level above. So the gap is the difference between the stair riser height and the slab thickness,( without an edge beam condition.)
    This only happens with a monolithic stair, as this type of stair is defined without a riser, so there is nothing to close the 'gap'. But, of course, the "gap" doesn't really exist, since there would be an edge beam/ thickening to connect the reo properly.

    If you were cutting a section through the stair lengthwise, you could use the 'cut profile' tool to draw in the edge condition. Otherwise, for 3D and elevations, you could use a sweep, as mentioned.
    Bruce Gow.

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    All AUGI, all the time Arnel Aguel's Avatar
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    Default Re: Monolithic Concrete Stairs

    Beegee, certain designs doesn't need an edge beam condition. Should it be that a basic and most widely used type of stairs like this be a simple process for a very powerful program? Drafting the edge beam condition to hide the gap is for me not the solution of the problem. Who knows one would be needing 3d for rendering.

    I am not sure also if sweep will work as my requirement is actually a U-type concrete stairs.

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    Super Moderator beegee's Avatar
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    Default Re: Monolithic Concrete Stairs

    Yes, monolithic stairs can be improved in Revit, and I expect they will be, but until then, just model a sweep or an extrusion, to create the closure between the stair and the slab, if you don't want a beam.
    Bruce Gow.

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  10. #10
    I could stop if I wanted to Nic M.'s Avatar
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    Default Re: Monolithic Concrete Stairs

    I use the following work arround fot monolithic stairs:

    - draw the stair as usual
    - in the properties:
    - add 1 stair to the "actual Number of Risers"
    - manualy calculate the new rise of the stair
    - put this number in the "Top offset"
    - OK now you get an message to add the correct number of treads
    - strech the run to add a tread OK
    - put the stair in possition

    You now have a stair that connects to the upper level. BUT in the properties it reads 18 risers, while actualy there are 17. So look out.

    I can post your stair back to clarify my bad english.
    Let me know if this is usefull to you

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