For concrete breakout in shear, anchor near edge and load towards edge, D.6.2.1 gives Avco = 4.5 x Ca1^2 and notes in the text "for a deep member". Fair enough. D.6.2.4 deals with anchors in sections of limited thickness such that "both edge distances ca2 and ha are less than 1.5ca1". What about thin members, i.e. slabs, where ha < 1.5ca1 but there is infinite edge distance for ca2? It would seem that the vertical portion of the area calc gets capped at member thickness, h. So it would be Avco = (2 x 1.5ca1) x h.
Although it doesn't state the above anywhere it seems to make sense and goes along with the diagrams/derivations. However when I run this in Hilti Profis I see that they're using the ca1^2 and therefore getting a huge area. Maybe a mistake in profis - or am I missing something?
ACI does address this exact configuration for the group of anchors in figure .6.2.1(b) where they cap the height at "h" which would seem to confirm my way of doing it. Profis does seem to follow this diagram for the group.
Although it doesn't state the above anywhere it seems to make sense and goes along with the diagrams/derivations. However when I run this in Hilti Profis I see that they're using the ca1^2 and therefore getting a huge area. Maybe a mistake in profis - or am I missing something?
ACI does address this exact configuration for the group of anchors in figure .6.2.1(b) where they cap the height at "h" which would seem to confirm my way of doing it. Profis does seem to follow this diagram for the group.