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.

Students Click Here

Cover Plate Thickness

Cover Plate Thickness

Cover Plate Thickness

I recently had a fabricator request increasing a cover plate thickness, here are the parameters of the situation.

Flange thickness = 1.34"
Cover Plate thickness = 1.5"
Requested CP Thickness by contractor = 1.75"

Normally I wouldn't hesitate to approve the request but AASHTO LRFD limits the C.P. thickness to twice the flange thickness which their request would violate. It's not over by much but I'm curious, does anyone know why this limitation exists? There's no discussion in the commentary and if I could understand the limitation a little better, I think I could be OK with the change.

RE: Cover Plate Thickness

Maybe I'm missing something but 1.75 is less than 2 times 1.34 (assuming one flange is 1.34" thick).

Off the top of my head the thickness limitation could be a fatigue concern.

RE: Cover Plate Thickness

I believe bridgebuster is correct. I don't have the code in front of me, but you may look at the fatigue category details. I imagine it's in a low stress range.

RE: Cover Plate Thickness

Yes the 1.34 value is incorrect. Typo on my part.

RE: Cover Plate Thickness

I didn't know cover plates were still used for new construction. Was there some kind of girder depth restriction?

RE: Cover Plate Thickness

Yes. We have no choice but to provide a cover plate due to that very issue.

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! Already a Member? Login


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