Reentrant corners 1

[Hnewton]

What is the difference between a sharp corner and a reentrant corner?

 

[UcfSE]

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.

 

[rhit94]

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

 

[yli]

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