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Reentrant corners

Reentrant corners

Reentrant corners

(OP)
What is the difference between a sharp corner and a reentrant corner?

RE: Reentrant corners

A sharp corner has a sudden change in direction, like a 90 degree corner, as opposed to a slight radius or fillet.  IT will have a point at the change in direction.  A reentrant corner is an inside corner.  If it were a slab for instance, at an inside corner you would have 270 degrees of slab and 90 degrees of not-slab, the corner points to the inside of the building.  An outside corner is the opposite.  

RE: Reentrant corners

UcfSE said it well.  Additionally, some form of crack propagtion control (jointing, reinforcing, etc.) is warranted at a reentrant corner.

RE: Reentrant corners

Another purpose of reentrant corner is to
reduce the stress concentration, which is the primary cause of crack at corner.

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