Precast structural extension - exporting hollow-core slabs to ifc

[Anonymous]

Hello,

I am having problems with exporting Hollow-core slabs to ifc without them losing their spatial container (floor level). For example, I have made a simple model in revit with two floor levels, Level 1 and Level 2 respectively. I used the precast extension tool to split the floors into hollow-core slabs. 

Now in revit, when i select a random second floor slab, it is referenced Level 2.

But after i export this file into IFC format, the second floor slabs seem to lose their spatial information. I have tested it with Autodesk Navisworks and Solibri viewer. After exporting, all the slabs are adressed to Level 1.

Here is a picture from Autodesk Navisworks:

I must be doing something wrong. Has anyone solved this problem yet?

I really appreciate any help you can provide.

Best regards

[Anonymous]

I've managed to find a little workaround. Whilst exporting revit to ifc, i had ticked the following line:

After unticking "export parts as building elements", the hollow-core slabs belong to the right level.

But the problem persists - Now i cannot pick hollow-core slabs separately from the original slab. Instead, when i try to pick only one hollow-core slab, the whole floor gets activated, as seen in the picture below.

I'm fairly new to revit and at the end of my wits. Thank you for any help you can offer

Best Regards

[teodorb]

Hi @Anonymous,

Could you please provide the version of Revit you are using and also the version for the exporter?

Thank you,

[Anonymous]

I am using Autodesk REVIT 18.3.1.2, Build 20180423_1000(x64), 2018.3.1. 

IFC version:  IFC 2x3 Coordination View 2.0

Just in case, i was using Autodesk Navisworks Simulate 2018 version: 15.0.1314.36

[teodorb]

Hi @Anonymous,

Could you also please attach the Revit model and the actual IFC export?

Thank you,

[Anonymous]

Hello @teodorb

I've attached the requested models. Somehow, after using the precast extension tool to split floors to hollow core slabs, the IFC file gets Humongous.

For exporting, I've been using level of detail Medium. If i use Extra Low settings, the hollowcore slab voids are hexagons, instead of circles. Unfortunately, we need those voids to appear as circles.

 I packed the IFC file into *.zip folder, as it reduces the file size by ~5 times.

[teodorb]

HI @Anonymous,

Unfortunately I couldn't manage to find a solution for your issue inside Revit.

Kind regards,

[Anonymous]

Hello @teodorb

Thank you for your effort. I guess the problem lies within different IFC viewers and their core settings then, which fail to communicate with Revits exported information. Although, based on my rather insufficient competence on the matter, i am really not sure about anything :).

Best Regards