Hole deformation consideration in bolted connection bearing check 1

[Hadeer Salah]

Regarding bearing check for the bolted plate, I want to know when should I use Rn = 2.4*d*t*Fu(deformation is a design consideration)& when should I use Rn = 3*d*t*Fu (deformation is not a design consideration)??


Hadeer

 

[ATSE]

See the commentary, which is rich with background info.
The dividing line is 1/4" hole elongation. 2.4 leads to <= 1/4" elongation at service loads. 3.0 leads to 1/4".

 

[kwinner]

Where I have seen this specifically referenced is in the Seismic Design Manual Section D.2(a) requiring bolted connections in the SFRS to be designed with deformation as a design consideration.

 

[h-badawy]

if you are designing your structure/building as per AISC341-05 "seismic provisions for structural steel buildings", you have To prevent excessive deformations of the bolted connection due to bearing on the connected material, the bearing strength is limited by the " deformation consideration" equal to (Rn = 2.4dtFu) see section J3.10 AISC360-05. The aim of this limitation is to limit the bearing deformation to an approximate maximum of 0.25 inches (6 mm).

Thank you