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!

*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.

Jobs

Flange restraint at base plate

Flange restraint at base plate

(OP)
I have a column which is part of a sway frame, pinned connection assumed at base plate, so it basically acts as a cantilever with load at the end. When calculating αm to AS4100 5.6 what sort of restraint can I use at the base plate? If the critical flange is unrestrained then αm=1.25 (Table 5.6.2); if it is laterally restrained then αm=1.75 (Table 5.6.1).

RE: Flange restraint at base plate

It does have restraint and you can use am = 1.75.
This assumes the critical compression flange is not restrained between base and rafter.
If the critical flange is restrained by girts or similar 'am' will approach 1.0

RE: Flange restraint at base plate

Agree with apsix and use αm=1.75 or even αm=1.81 as per item (iii) in 5.6.1.1 (assuming triangular bending moment).

It wouldn't be difficult to prove that the baseplate satisfies the requirements to effectively prevents lateral deflection of the critical flange as well as twist rotation. Particularly when the analysis shows that the moment at the section under consideration is 0.0kN-m.

Out of interest, what thickness is the baseplate and how many anchor bolts have you provided.

RE: Flange restraint at base plate

(OP)
Base plate is 32mm with 4-M24 bolts.

Thanks. I will use αm=1.75  

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close