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Thread: Inclined (sloped) beams and slab.

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    Inclined (sloped) beams and slab.

    Can you please tell me if this is possible in Revit?

    Our architect wants for a building, that the slab over the last floor to have a slope. More precisely, the front columns are 1.5m higher then the ones from the back. So, we need to make the beams and the last level slab inclined.
    Attached to this problem comes another one:
    Between the front column (which is 1.5m higher then the one from the back), we have other 3-4 columns. How can I extend them up to the beam? (i dont want to compute the hight with Acad).

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    Quote Originally Posted by lucis29 View Post
    Can you please tell me if this is possible in Revit?

    Our architect wants for a building, that the slab over the last floor to have a slope. More precisely, the front columns are 1.5m higher then the ones from the back. So, we need to make the beams and the last level slab inclined.
    Attached to this problem comes another one:
    Between the front column (which is 1.5m higher then the one from the back), we have other 3-4 columns. How can I extend them up to the beam? (i dont want to compute the hight with Acad).
    I'm a window/curtain wall detailer so I don't deal with floors, beams, or columns much but just playing around it's easy to create a sloped floor using a Slope Arrow when placing the floor. You can specify the height of the floor at the head and tail of the the Slope Arrow to have whatever slope you like. Then select the columns and use Attach Top/Base and the top of the column will follow the floor slope where ever they occur. Hopefully it's as simple as that. If not, someone else in the know will be here soon to straighten us out

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    Thanks Dave.
    I fixed the inclined slab and the attachment of the columns. Now I only have the problem with the beams.
    How can i make a beam follow the inclined path of the slab?

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    Quote Originally Posted by lucis29 View Post
    Thanks Dave.
    I fixed the inclined slab and the attachment of the columns. Now I only have the problem with the beams.
    How can i make a beam follow the inclined path of the slab?
    There are several solutions.

    One solution is this: after you have fixed the height of the columns using Attach > Top, as per Dave's reply, go to a floor plan, and draw a beam, activate "3D Snapping" and set a Z-direction justification > top or bottom in the properties window. Click on the center of the first column, and then on the center of the last column (see image 1). Then, go to a section and see if the beam is correct. If it is, go back to a floor plan, and copy that beam from one grid line to the others.

    Another solution is this: using the beam system tool, create a set of beams based on the reference plane created by the lower face of the slab or roof. This has the advantage that if the slope of the slab or roof changes, the set of beams will follow the slope. (see image 2), (saved from my old Augi posts).
    Attached Thumbnails Attached Thumbnails Inclined (sloped) beams and slab.-beam.jpg   Inclined (sloped) beams and slab.-roof-n-workplane-3.jpg  

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    Quote Originally Posted by lucis29 View Post
    Thanks Dave.
    I fixed the inclined slab and the attachment of the columns. Now I only have the problem with the beams.
    How can i make a beam follow the inclined path of the slab?
    I would make a new reference plane at the bottom of the slab, name it, then select the beam and use Pick New to select the sloped reference plane. You should be able to lock the beam to the ref plane. Once again, I'm no expert at this type of construction so this is all "by guess and by golly"

    yeah, what Alf said

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    Thank you Alf. The problem was with the 3D snap not being checked.

    Now there is a problem with the beam that attaches to the bottom of the slab. How can I attach it to the top of the slab?
    Should I offset the slab with its thickness?
    Last edited by lucis29; January 2nd, 2011 at 09:02 PM.

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    Quote Originally Posted by lucis29 View Post
    Thank you Alf. The problem was with the 3D snap not being checked.

    Now there is a problem with the beam that attaches to the bottom of the slab. How can I attach it to the top of the slab?
    Should I offset the slab with its thickness?
    I would use the Reference Planes-method. Draw a refplane under the desired angle and place the beams on this reference plane. You can choose to place the plane on the bottom or top of the slab, just move it around and beams will follow.

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