Stairs IFC Export - No Quantities export and Issues in units conversion


Hi all,

we detect several issues about stairs and IFC Export:

- Issue 1: Allplan don't export any quantity pset of stairs

- Issue 2: some attributes are exported with incorrect conversion process

Best regards,
Xavier Coll
EiPM

Xavier Coll • Architect, Project Manager I+D, BIM Manager, BIM Auditor
EiPM • http://www.eipm.es/en/

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Hi Xavier,

Check if this stair is IfcStair or IfcStrairFlight in the first tab of Properties in FZKViewer - Element Properties.
If not - set it in Allplan in Attributes-function. You will need IFC-section in Attributes list and IFC-type as an attribute.
Also, you will probably need to match Allplan's attributes with IFC-attributes, you can do it in IFC-Export dialogue.
To understand what is a name of an attribute, you can look into IFC-specification, for instance, for Pset_StairFlightCommon: https://standards.buildingsmart.org/IFC/RELEASE/IFC4_1/FINAL/HTML/schema/ifcsharedbldgelements/pset/pset_stairflightcommon.htm

By this way, using defined IFC-type, you can transfer any defined type and needed attributes, even if it is not existed in Allplan naturally, as Pile, for example.

Regards,
Alexey

___________________

Alexey Davydov
http://www.youtube.com/adavydovbim

Hi ADavydov, and thanks a lot for your answer.

Cité par ADavydov
Check if this stair is IfcStair or IfcStrairFlight in the first tab of Properties in FZKViewer - Element Properties.

I just checked IFC, and the stairs are exported as IfcStair...

I Also did a second test, adding the attribute "Ifc obejct type", in order to force allplan to export quantities Pset, but the IFC exported also have the same erratic result.

Xavier Coll • Architect, Project Manager I+D, BIM Manager, BIM Auditor
EiPM • http://www.eipm.es/en/

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Hi Xavier,

Hmm... first of all, if you are talking about Qto_ (Quantity take-off) set then it is existing since IFC4 and only for IfcStairFlight:
https://standards.buildingsmart.org/IFC/RELEASE/IFC4_1/FINAL/HTML/schema/ifcsharedbldgelements/qset/qto_stairflightbasequantities.htm
There are only 3 values: Length, GrossVolume and NetVolume.

By the way, some basic values are included into Calculated Values - length in planview, width in planview, total height, surface area and volume. Problems are that there is not length by stairway and that X and Y are not Length and Width and it will provide wrong results as "length" and "width", if this stair is not going by X and especially if this stair will be rotated in the planview.
Another problem is that there are not such specific attributes in IFC - neither in Pset_StairCommon nor in Pset_StairFlightCommon, so you can't match Allplan's attribute with IFC-attribute, even if you would to do this.

It seems like only one solution is here - add User-defined attribute in Allplan and read this attribute in IFC as Allplan's attribute.

Best regards,
Alexey

___________________

Alexey Davydov
http://www.youtube.com/adavydovbim

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