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How would you classify this connection?

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JD P.E.

JD P.E.

Mechanical
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Oct 17, 2021
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Ran into a connection I haven't seen. Doing a re-rate on a monorail structure. The picture is of the type of connection used on one side of the monorail to column.

Would you classify this is a partially restrained moment connection? It's sort of inverted since if you flip this 90 degrees, it's a standard column to beam moment connection.

Thoughts?
 
 https://files.engineering.com/getfile.aspx?folder=eb242019-7876-478e-b5e4-fa870e6c8673&file=Forum_Q.JPG
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Yeah, it seems reasonable to assume that connection was designed to transfer moment since one wouldn't normally go with an eight bolt pattern otherwise.
 
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Looks like a bolted end plate moment connection to me. This would be considered a fully restrained moment connection. AISC has some designed guides on the subject.
 
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I would consider that to be a fully restrained moment connection. You're right that it's identical to a standard beam to column connection, just rotated 90 degrees and the connection doesn't care about its orientation.

Extended_End-Plate_Moment_Connections_akffbb.png

(The picture on the left is from AISC's Design Guide 4 - Extended End-Plate Moment Connections)

Structural Engineering Software: Structural Engineering Videos:
 
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Thanks guys. I guess I was just questioning if the beam would still effectively transfer the moment with not having the top flange also restrained (like a normal beam to column connection).
 
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JD P.E. said:
Thanks guys. I guess I was just questioning if the beam would still effectively transfer the moment with not having the top flange also restrained (like a normal beam to column connection).
Click to expand...
The stiffeners are doing that the job here.

The moment connection doesn't know which way is up/down/left/right and it doesn't know where the moment force is coming from. If the beams/columns are the same member then the connection is analogous and symmetrical to you typical beam column moment connection.

** I said "moment force" because clearly the axial/shear forces are different per member.
 
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