×
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

Joist to Steel Beam Lateral Conx.

Joist to Steel Beam Lateral Conx.

Joist to Steel Beam Lateral Conx.

(OP)
I have a question about the connection of a steel joist to the top of a steal beam.  When lateral load is being transferred from the diaphragm to the steel beam through the joist, there is 2.5" of eccentricity in the connection from the joist to the beam. (2.5" is the standard depth of the joist extension)

How do you typically account for this eccentricity?  At my workplace, it is always neglected and I am wondering if this is an OK practice??  

RE: Joist to Steel Beam Lateral Conx.

I believe common practice is to do one of three things:

1.  If the load is fairly small, ignore it.

2.  Specify on the drawings that the joist manufacturer must design the seats for X lbs. of lateral force at the seat.

3.  Add 2 1/2" square steel tubes between the joists and use a continuous deck edge angle as a diaphragm collector to transfer the diaphragm shear into the tube and then into the beam.  Tubes can be included in a set number of spaces as required to transfer the shear and limit the axial force build-up in the angles.

Of the three above - I usually use 1 or 3 as I believe the SJI isn't too keen on the 2nd option.

Other opinions?

 

RE: Joist to Steel Beam Lateral Conx.

I agree with JAE.

Fisher's book on designing with steel joists has allowable values for what you are describing, known as "joist seat rollover."

DaveAtkins

RE: Joist to Steel Beam Lateral Conx.

JAE:

I usually use method 2 or 3 and have never had any problem with the joist manufacturers from option 2.

Dave: I specify the joist rollover loads and deflection so that the manufacturer can design the appropriate seat.

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