View Full Version : Floor, or slab?
Mike Sealander
2007-10-26, 06:45 PM
What is a floor, relative to a slab? I am perplexed. Functionally, how do the two differ?
Steve_Stafford
2007-10-27, 06:57 AM
aaah....language. A floor is a slab and a slab is a floor. But a foundation slab is different :smile:
The Structural Design Bar calls a "floor" a Slab.
The Modelling Design Bar calls a "Slab" a Floor.
The Structural Design Bar calls a Foundation Slab a Slab.
I'm not sure why are you confused? :wink:
The Foundation Slab is a different element from Floor and Slab but Floors and Slabs are the same element. I guess they used different terms to appeal to the disciplines who work with them? Architects call them floors while engineers call them slabs? Wild guesses abound.
Fwiw, the tool Modelling > Opening > Opening Shaft does not cut Foundation Slabs but will cut any Floor/Slab, Ceilings and Roofs it comes into contact with.
Mike Sealander
2007-10-29, 06:17 PM
I was confused because I want to know if the two are different, or not, and if they are different, in what way? Does it matter to use one instead of the other? It appears perhaps not, except when it is so.
steve922542
2008-04-01, 03:45 PM
Fwiw, the tool Modelling > Opening > Opening Shaft does not cut Foundation Slabs but will cut any Floor/Slab, Ceilings and Roofs it comes into contact with.
I'm having trouble with the shaft opening tool. I'm working on an as-built and to get started, I used the surveyed openings on level 4 to create shafts from 4-11. Now I am going back through and cleaning up floor by floor from the top down. Since each floors openings are unique, I am editing the slab/floor sketch and changing the constraints of the shaft opening down a level as I go. Make sense so far?
The problem is that the holes cut in the slab by the original shaft opening are not 'healing' themselves as I adjust the height of the opening. Now I have both the shaft opening holes and the slab edit for the individual floor cutting the slab. Any thoughts?
Steve_Stafford
2008-04-01, 04:12 PM
If I read you correctly you are using the Shaft Opening to establish where the "hole" is for floors 4-11 and then altering each slab individually per their sketch to define the "real" opening at each floor? If so you'll probably have to remove the Shaft Opening to get the floor slabs to reflect the correct/actual opening dimensions. I'm assuming the Shaft Opening is at odds with your sketch changes and the Shaft Opening is winning...
steve922542
2008-04-01, 05:34 PM
Yes, that is what *appears* to be happening, but with more digging I've discovered I'm having some real display issues. One of the shaft openings (the object) is not selectable in the 3D view even cycling through. Cutting a detail section and using that view, all are selectable. Some pipes are not showing up in 3D while others of the same family are. Beam systems are visible, but individual structural beams (that use the same members) are not.
At this point I don't know... but it probably is not just the shaft opening issue that I thought it was. And I will likely just eliminate the opening and edit the slabs which maybe I should have done from the start. That tool is just such a great idea! Not so much for as-builts however.
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