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How to calculate the building volume above the terrain

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Anonymous
1617 Aufrufe, 10 Antworten

How to calculate the building volume above the terrain

A large number of the communes in Switzerland applies the "mass ratio" to the site area for the regulation of the building use instead of the floor area ratio. It is definded as the main building volume above the existing terrain - how can be calculated in revit, could "volume" be cut off  by "terrain"?

@robert.javor@autodesk.com

 

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barthbradley
als Antwort auf: Anonymous

So, I'm trying to envision this. You have Building Levels that start below grade and you want to calculate the Volume of the building ABOVE grade.  Right?  I'm thinking Level Computational Height.

 

https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2019/EN...

 

https://www.engipedia.com/revit-room-computation-height-what-is-it-good-for/

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syman2000
als Antwort auf: Anonymous

You can try getting the volume fill/cut from the terrain from the tutorial below.

http://therevitkid.blogspot.com/2016/03/revit-tutorial-calculating-cut-fills.html

Check out my Revit youtube channel - https://www.youtube.com/user/scourdx
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dylan45DCS
als Antwort auf: Anonymous

Hi, I have the same issue as this previous post. I need to calculate all "volume" of a building above the slope of natural grade on a site. The room computation does not account for the slopping terrain as it cuts through the project. Any ideas? 

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barthbradley
als Antwort auf: dylan45DCS

Volume of the exposed Structure?  That portion that is above ground?  Why? Just curious to know.  That's a new one.  

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dylan45DCS
als Antwort auf: Anonymous

Really same issue as above. The Land Use Code in the jurisdiction states that there is no limit on floor area ratio but instead a 30,000 cubic square foot above natural terrain which is above the "slope" of the grade as it cuts through the project. This is on a steep hillside so you can visualize how this would look. 

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barthbradley
als Antwort auf: dylan45DCS

You can get there using Mass (for total Volume) and Graded Region Copy/Building Pad to calculate earth Volume removed for Mass and then subtract one from the other to get the exposed Volume.       

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dylan45DCS
als Antwort auf: Anonymous

One more, is there a simple way to take an already created "model" into a massing model? I have searched the Google and I get confused answers. 

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ToanDN
als Antwort auf: dylan45DCS


@dylan45DCS wrote:

One more, is there a simple way to take an already created "model" into a massing model? I have searched the Google and I get confused answers. 


Depends on how complex your building is.  There are a couple of approaches: Mass and Space.

 

Mass:

- create a 3D view with only exterior enclosure (roofs, exterior walls, bottom floors), export to SAT

- create a conceptual mass, import the SAT in, create forms based on the SAT geometry

- get the form's volume

 

Space:

- set Area and Volume computations to Areas and Volumes

- create an Analysis phase before Existing

- draw space separation lines along the exterior perimeter, set them to be demolished in Existing phase

- copy roofs and bottom floors from the New construction phase to the Analysis phase, set them to be demolished in Existing phase

- create Space formed by the space separation lines and roofs/floors above,  get the volume of the Space

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barthbradley
als Antwort auf: dylan45DCS

@dylan45DCS: Here's what I was talking about:

 

Exp512-1.png

 

@ToanDN : I played with a variation on your suggestion, but volumes aren't the same (but maybe close enough for government) . The issue is with creating a bounding element between the 2 "Rooms" that exactly matches the surface of the sloping terrain.  You didn't mention that.  Did your method negate the need for that?  If so, how?  

 

Exp512-2.png

 

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ToanDN
als Antwort auf: barthbradley


@barthbradley wrote:

 

 

@ToanDN : I played with a variation on your suggestion, but volumes aren't the same (but maybe close enough for government) . The issue is with creating a bounding element between the 2 "Rooms" that exactly matches the surface of the sloping terrain.  You didn't mention that.  Did your method negate the need for that?  If so, how?  

 

 

 


I only answered how to calculate the building volume as a whole.  How to get the volume of the soil taken out is already answered earlier, by using topo/graded region/pad's cuts and fills. 

 

Volume above grade = Whole building volume - Topo cut volume.

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