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Forums >> Revit Building >> Technical Support >> Multiple sloping slab on grade
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Joined: Mon, Jul 25, 2005
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What is the best way to show multiple slopes for slab on grade? It is for a lower level condo parking garage. The slab slopes to middle of bays with perimeter of bays (4 sides) being the high side.
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Joined: Mon, Jan 12, 2004
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Not sure as i haven't used revit structural before.
Revit Building doesn't have the ability to give floors multiple slopes.
Work arounds include modelling an in-place floor with all the extra slopes etc modelled as voids/solids of various types. This can also be an external generic model floor familiy that is then embed into an in-place floor family in the project.
Other option is to use a roof as opposed to a floor as they allow multiple slopes to an extent...
HTH.
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Not sure if I'm following correctly, but if you are making a rectangular slab drain to the center you would need to make four separate triangle slabs that point to the center and apply the slope to each.
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Thanks to both. It looks like the 4 triangles will work for what I am doing for now. However, I will have more advanced slopes where I will have to explore Mr. Spot's approach. I will have to keep digging into the help files.
thanks again!!
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Yes, creating blend voids to cut the slope would be a great approach, especially if you want the bottom to remain flat, as in a sloped pour on a subfloor. You would have to make two void blends to sandwich the slab to make the bottom slope also.
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I think the void blend is really the way to go - its real fast also.
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I realised to make the bottom void cut correct you need to create a void sweep with a path around the perimeter and a wedge shape profile from the outside to the center for the cut out. Edit: oops! -that only works for a square, for a rectangle the sweep would need to be made for each side. - guess its back to the 4 triangles for simple rectangular slab with sloping bottom!
Post edited on 2005-09-27 12:24:38
Post edited on 2005-09-27 12:41:59
Post edited on 2005-09-27 12:45:11
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WOW!! You guys make this look so easy. I am currenlty having problems with voids forms and solid forms. When I go to finish a void I get the error "Some Void Forms of this family do not cut anything and will be deleted. To make a Void Form cut something else use the Cut Geometry tool.' The help files only tells me a brief description of what the tools do and maybe a picture that is a box, not and actual structural senario. Any info on where I can find additional material for reading up and mastering this stuff. Thanks again for the help, you certainly have given me some stuff to look into and try to reproduce.
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By default voids will only cut elements created before them (within the same family). To tell a void to cut a solid created sequentially later than itself. Select the cut geometry tool, pick the void and then the element you wish it to cut.
Voids can only cut system families (walls, floors, roofs etc) and they should be the same category family as the element you want to cut (with the exception of doors/windows...)
HTH.
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You need to use the cut tool with the void to make your cut before you complete and exit the void family or else you will lose the void when you exit the family. One trick I use when I've created a void that is not cutting as I expect but I want to keep the family shape without making a cut at the moment is to turn the void into a solid (by it's properties) so you can finish and exit the family then come back to it at a later time by editing the solid and turning it back into a void.
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