Design Guide 4 Mnp Question
Design Guide 4 Mnp Question
(OP)
This is more of philosophical question than technical.
AISC Design Guide 4 covers Extended end plate Moment Connections.
One of the first steps is to determine the diameter of bolts required.
After the actual diameter is determined you go up to the next available size bolt.
Later in the process the capacity of the actual available bolt is used to determine a "No prying bolt moment".
This moment is later used to size flange stiffeners and web stiffeners on the column side of the connection.
My actual required diameter is 0.53", so I would use a 5/8" bolt.
However the customer requires that all structural bolts be no less than 3/4".
If I use 3/4" diameter bolts to determine the "no prying bolt moment" the flange stiffeners are unusually large.
It is my opinion that I can use the 5/8" diameter bolts to determine the moment and continue the design process from there even if in reality I will provide 3/4" bolts.
Does this sound reasonable or am I totally off with this?
thanks
AISC Design Guide 4 covers Extended end plate Moment Connections.
One of the first steps is to determine the diameter of bolts required.
After the actual diameter is determined you go up to the next available size bolt.
Later in the process the capacity of the actual available bolt is used to determine a "No prying bolt moment".
This moment is later used to size flange stiffeners and web stiffeners on the column side of the connection.
My actual required diameter is 0.53", so I would use a 5/8" bolt.
However the customer requires that all structural bolts be no less than 3/4".
If I use 3/4" diameter bolts to determine the "no prying bolt moment" the flange stiffeners are unusually large.
It is my opinion that I can use the 5/8" diameter bolts to determine the moment and continue the design process from there even if in reality I will provide 3/4" bolts.
Does this sound reasonable or am I totally off with this?
thanks






RE: Design Guide 4 Mnp Question
Dik
RE: Design Guide 4 Mnp Question
I should also point out that the other end plate design guide will give you a procedure for designing the connection that includes prying and thinner plates.
RE: Design Guide 4 Mnp Question
The connection is not governed by seismic loading but I will remember this in the future.
thanks,
RE: Design Guide 4 Mnp Question
Juston Fluckey, SE, PE, AWS CWI
Engineering Consultant