×
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

Wood beam wider than steel post

Wood beam wider than steel post

Wood beam wider than steel post

(OP)
I have a client that is removing a bearing wall on the ground floor in a 2 story residence. They want to keep the costs down so a steel beam is out of the question. The floor joists are 2x10 and on one side they frame into the beam and on the other side the floor joists are parallel to the beam. Also, they want the beam as shallow as possible so that it does not stick down below the ceiling to much, so I calculated that a 10.75" x 12" glulam beam would work.

My question is concerning the post. Instead of using a wood post the same width as the beam I am thinking of using a 4inch square steel post and a steel bucket welded to the end to support each end of the beam. I realize that there is some torsion on the beam but since the loading is relatively light I am not concerned about it, rather the connection of the beam to steel bucket. Anyone have any idea how to analyze the forces on the steel bucket so that I can determine the correct steel thickness?

My thoughts were along the lines of determining the eccentric moment (torsional moment/ft) along the beam length due to the floor joists hanging from one side. Then the torsional moment at each end that needs to be resisted would be 1/2 of the beam length multiplied by torsional moment/ft. So this is where I get a little confused about how to determine the bending in the bottom of the bucket that cantilevers past each side of the 4inch post.

Any thoughts would be greatly appreciated.

RE: Wood beam wider than steel post

My first choice would be to remove the torsion by connecting every third or fourth joist to the beam such that the beam cannot rotate.

Alternatively, if the torsional moment is Mt, consider a force F acting up on one side and down on the other where F=Mt/b. Then the moment in the bent plate is F(b-4)/4 where b is the width of beam. Bolts through the upstanding legs of the bent plate and the glulam beam must be designed to resist F in single shear.

BA

RE: Wood beam wider than steel post

(OP)
Ba, ahhh, thanks I didn't even think about connecting the bottom of the joists to the beam in order to remove rotation.

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