Column

Definition

Geometry

Geometry type	Extrusion	Profile	Segments	Clipped	Slanted
BoundingBox
Extruded solid	Linear	Rectangular	1	No	No
Extruded solid	Linear	Circular	1	No	No
Extruded solid	Linear	Arbitrary	1	No	No
Extruded solid	Linear	Curved	1	No	No
Extruded solid	Linear	Rectangular	1	Yes	No
Extruded solid	Linear	Circular	1	Yes	No
Extruded solid	Linear	Arbitrary	1	Yes	No
Extruded solid	Linear	Curved	1	Yes	No
Extruded solid	Linear	Rectangular	1	No	Yes
Extruded solid	Linear	Curved	1	No	Yes
Extruded solid	Linear	Arbitrary	1	No	Yes
Extruded solid	Linear	Curved	1	No	Yes
Extruded solid	Linear	Rectangular	1	Yes	Yes
Extruded solid	Linear	Curved	1	Yes	Yes
Extruded solid	Linear	Arbitrary	1	Yes	Yes
Extruded solid	Linear	Curved	1	Yes	Yes
Brep

• Not slanted in the context of columns means, that the extrusion is in the direction of the global Z-axis
• As the basic representation columns should always have a bounding box. The bounding box can be used as a place holder for columns with complex geometry in programs that are not able to support the given geometry. This could be the case e.g. in programs that don't support slanted columns, columns with an arbitrary profile or Brep representation.
• Columns that are vertical or slanted and have a constant profile along the entire length of the column are transferred using an extruded solid.
  • The extrusion profile may be rectangular, circular, arbitrary or curved
  • Columns may be clipped at the bottom and the top, but they should not be clipped to change the profile of the column.
  • Columns may not have holes in them, not even using the opening element.
  • When solids are used for the column geometry the exchange files are more compact and it is easier to derive quantities from the column geometry. It is also easier to map to the most common column types used in programs, such as rectangular and circular columns.
• In all other cases the representation is made using Brep geometry
  • Columns with a varying profile
  • Columns with a profile that can't be expressed by IfcCompositeCurve. The vocabulary of the composite curve contains the following elements: straight segment, circular arc and elliptical arc.
  • Columns with holes
  • Curved columns

View considerations

• Arch. design >> Quantities take off / cost estimating
  • Column quantities (height / profile) from geometry

Documents

• IFCR2_IfcColumn_000320_jh.pdf

Used by views

• Arch. design >> Quantities take off
• Arch. design >> Thermal load calculations / HVAC system design
• CAD / visualization

Data structure

IfcColumn
GlobalId
OwnerHistory
Owner history [all]
Label
UserDefinedType
PartOfGroups
Grouping [1,2]
IsContainedBy
Containment [all]
RelatingObject
Building storey [all]
IsDefinedBy
Dynamic property assignment [all]
RelatingPropertyDefinition
PropertySet system [all]
HasProperties
Common column properties [1,3]
LocalPlacement
Relative placement [all]
PlacementRelTo
Building storey [all]
Representations
Geometric representation [all]
Items
Bounding box geometry [all]
Extruded solid: rectangular [1,3,5]
Extruded solid: circular [1,3,5]
Extruded solid: arbitrary [all]
Extruded solid: curved [1,2,3,5]
Extruded solid: rectangular, clipped [3,5]
Extruded solid: circular, clipped [3,5]
Extruded solid: arbitrary, clipped [3,5]
Extruded solid: curved, clipped [3,5]
Extruded solid: rectangular, slanted [3,5]
Extruded solid: circular, slanted [3,5]
Extruded solid: arbitrary, slanted [3,5]
Extruded solid: curved, slanted [3,5]
Extruded solid: rectangular, clipped, slanted [3,5]
Extruded solid: circular, clipped, slanted [3,5]
Extruded solid: arbitrary, clipped, slanted [3,5]
Extruded solid: curved, clipped, slanted [3,5]
Brep geometry [3,5]
Classification
Classification assignment [none]
Classifications
Classification [none]
calcColumnSectionArea
calcColumnVolume

Uses concepts

Bounding box geometry [all]
Brep geometry [3,5]
Building storey [all]
Classification [none]
Classification assignment [none]
Common column properties [1,3]
Containment [all]
Dynamic property assignment [all]
Extruded solid: arbitrary [all]
Extruded solid: arbitrary, clipped [3,5]
Extruded solid: arbitrary, clipped, slanted [3,5]
Extruded solid: arbitrary, slanted [3,5]
Extruded solid: circular [1,3,5]
Extruded solid: circular, clipped [3,5]
Extruded solid: circular, clipped, slanted [3,5]
Extruded solid: circular, slanted [3,5]
Extruded solid: curved [1,2,3,5]
Extruded solid: curved, clipped [3,5]
Extruded solid: curved, clipped, slanted [3,5]
Extruded solid: curved, slanted [3,5]
Extruded solid: rectangular [1,3,5]
Extruded solid: rectangular, clipped [3,5]
Extruded solid: rectangular, clipped, slanted [3,5]
Extruded solid: rectangular, slanted [3,5]
Geometric representation [all]
Grouping [1,2]
Owner history [all]
PropertySet system [all]
Relative placement [all]

Used by concepts

Building storey

Copyright © 2000-2002 BLIS-Project [BLIS, Registered Organization]
Author: Jiri Hietanen (jiri@blis-project.org)
All rights reserved.