Pset_ArchElementCommon Properties common to all types of _IfcArchElement_. IfcArchElement IfcArchElement InnerRadius The inner radius of the element. OuterRadius The outer radius of the element. CentroidRadius The centroid radius of the element. Thickness The geometric thickness of the object. Thickness 厚さ フィンの厚さ IsLoadBearing Specifies whether the element is load bearing (TRUE) or not (FALSE).