Pin Connected Member
Pin Connected Member
(OP)
I am having a difference in interpretation with a consultant. Please let me know what you think. This is my side:
AISC Manual of steel construction, 9th Edition.
Section D3: 0.45Fy applies in determining the hole diameter and plate thickness related to bearing load at the pin hole & (J8) 0.90 Fy applies in determining the pin diameter.
Rick
AISC Manual of steel construction, 9th Edition.
Section D3: 0.45Fy applies in determining the hole diameter and plate thickness related to bearing load at the pin hole & (J8) 0.90 Fy applies in determining the pin diameter.
Rick






RE: Pin Connected Member
Dik
RE: Pin Connected Member
RE: Pin Connected Member
Are you interpreting D3 to apply to the design of the pin connected member with a hole, but not actually to the bearing stress of the hole......and J8 applies to the design of the pin and hole?
This is the same opinion as the consultant.
If that's true D3 really throws me off because it says:
"The allowable stress on the net area of the pin hole for a connected member is 0.45Fy". It speaks of the HOLE!?
Rick
RE: Pin Connected Member
Yes, I interprete D3 to apply to the design of the pin connected member with the hole. You have to consider it as two seperate checks. One check is to insure that the connected plate has enough meat around the hole to keep from tearing out. Another check is to insure that the plate and pin are large enough so that you will not get deformation around the hole. The difference in allowable stresses has to do with the mode of failure. For bearing you can use 0.9*Fy. This is because if the plate has some bearing deformation the connection will not necessarly fail. If the plate fractures around the hole then the connection will fail. This could be a shear tearout parrallel the the resultant force or a fracture tearout normal to the force.
RE: Pin Connected Member
If you follow the provisions of D3.2, the bearing stress limit of 0.9Fy never governs the thickness of the plate. In fact, algebraic manipulation of D3.2 gives an "apparent" bearing limit of 0.72Fy.