Problem

Block shear calculations on angles uses an incorrect tension area.

Reason

Limcon's detail diagrams show bolt holes as if they were centrally placed about the centerline of the angle leg, rather than being located according to AISC standard gage recommendations. When calculating the net tension area the edge distance Limcon approximates this by assuming that bolt group is centered on the angle leg less the angle thickness. For a 4" x 1/2" angle with 1" bolts this means Limcon is assuming a tension length of 1.25" instead of 1".

The block shear calculation is being corrected to be more exact in release 3.63.01.21.

Avoidance

Update to build 3.63.1.21 or hand check the block shear on angles when critical to the design.