×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Beam to Beam moment connection

Beam to Beam moment connection

Beam to Beam moment connection

(OP)
You have two beams framing into a girder, one on each side.  The two beams are in line.  One beam is a cantilever fastened with a moment connection to the girder.  Can the other beam be a simple shear connection or does it have to be a moment connection?  I have seen it designed both ways.  It has been said that since the other beam frames into the girder opposite the moment connection, that beam will stiffen the girder enough to resist the torsion created by the cantilever.  Can anyone tell me if this is true or what is industry standard.  Where can I find literature on this?

Most of the time we put a moment connection on both sides of the girder.

RE: Beam to Beam moment connection

I think it depends on how you deal with the moment at the end of the cantilever.  

If the main girder is designed to resist the vertical reaction plus the torsion from the cantilever, then the other connection may be 'pinned'.

If however the main girder is designed to carry the vertical reaction only, and you are relying on the second beam member to resist the moment from the cantilever, then both connections will need to be moment connections.

RE: Beam to Beam moment connection

depends on your connection.  if you put that moment connection, then it will be a cantilever with the backspan on it.  personally, i would put the moment connection and call it a day.

RE: Beam to Beam moment connection

oh yea, i think you're deflection will be higher if you don't make it a moment connection because that beam will rotate if it has nothing to pull it back.  someone correct me if i'm wrong.  

RE: Beam to Beam moment connection

Both connections MUST be moment connections if your girder is a wide flange.  Wide flanges have almost zero torsional stiffness so having the cantilever beam fixed to the girder, with the opposing beam pinned, will depend on torsional stiffness you don't have.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources