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Mon, Apr 18, 2011 at 1:00:23 PM | BIM LOD

#1

brettgoodchild


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Hello to all!

I have an issue (amongst many) regarding BIM LOD.

There seems to be a lack of good content to thoroughly explain and demonstrate this to both technical and non-technical people alike.

We have two jobs where the LOD is extremely important, one will be span to a 500 level per contract and we are the contractor...so it is up to us to maintain the model through as built.

I have read and reread AIA E202, I have the MPS and many other items but the problem I am finding is that they are all fairly vague in their descriptions and images. I am having a difficult time explaining to people what the difference is between the LOD's, especially 300-500. It seems the more people I talk to, the more I realize there are a lot of people out there who don't really understand this topic.

I understand the high level descriptions and get fabrication and as built, but there are so many more items left off by those descriptions that really should be expanded upon.

Does anyone have a good resource or documentation out there other than E202 and the MPS?


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Mon, Apr 18, 2011 at 1:04:26 PM | BIM LOD

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WWHub


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How about this for one?: http://www.aecbytes.com/feature/2008/MPSforBIM.html


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Mon, Apr 18, 2011 at 1:27:50 PM | BIM LOD

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brettgoodchild


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Thanks for the quick response Hub, can always count on You!

 

I took a lot from Vico and put it into my own document attempting to explain what LOD is and that is how I came, to my conclusion, that there seems to be a lot of open ended items. (Again, forming my own conlcusions here)

For example, one question I am getting a lot is does the LOD actually affect the amount of modeling on loadable content?

If it does, then what whould/not model per level? I have been told by a few people that it should and if so, are we to the point of taking SAT files and just importing them into a family for an extreme level of development?

NOTE: I can see how the LOD affect system families like wall and floor systems.

Another example would be does LOD require the modeling and coordination of all openings for MEP?

Or modeling of duct/pipe hangers...if so, again, what level of development and information?

To me, this is more along the lines of VDC for coordination purposes in the filed...

Last example from a recent conversation...at the 400 level, should one actually adjust the model to meet fabrication (at what cost?) or would it be acceptable to add a hyperlink in the property sets that go to the specs and shop drawings?

 

In my opinion, this should almost be broken into two categories, LODM (model) and LODI (information), so we can all understand with a clear picture of the level of modeling AND information required.

 

I know a lot of the LOD items are open ended and left upto the contractor, owner and other parties to decide upon the aggreed output and delivery... but a clearer picture would be very helpful.

 

Thanks again Hub, as always, very much appreciated!

 


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Mon, Apr 18, 2011 at 2:15:04 PM | BIM LOD

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WWHub


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Our users group in Cleveland, Ohio - NEORUG - has had a couple of prsentations by contractor / construction managers about these issues.  FOR A&E firms, I think we mostly don't get past 300. 

 

The question arises "What does the Revit model support and who provides that documentation?"  At these NEORUG meetings, the 400 - 500 detailing was usually not done by the A&E and maybe not in Revit. 

 

I think the industry has a long way to sort out where this is going.  I don't believe Revit is the answer for all of the 400-500 information.  Some sort of FM program that supports mult-program information needs to be used.  Revit is OK for the geometry and physical location of elementgs but much of the rest of this needs to be ind different formats.


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