×
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

Cantilevered bolted angle connection design

Cantilevered bolted angle connection design

Cantilevered bolted angle connection design

(OP)
Hello all,

Can someone point me to a manual or any other design aids for analysis of bolted angle connections. In my case, I am bolting a steel angle directly to a CMU wall - the angle will be oriented horizontal leg up, which will the act as a cantilever to support ~2 kip load (which comes from a 3" wide steel stair stringer that will bear on top of it). I have previously seen engineers completely discount any tension load created by the moment, and design the bolts as being purely in shear - naturally I am wondering how safe this is... Also, I imagine there is prying action, and if so, how should it be taken into account. Thanks!

RE: Cantilevered bolted angle connection design

- there is little prying action with the vertical leg turned upwards which is one of the reasons that we do that.

- in general, the tension on the anchor should not be ignored as a combined load is usually what governs.

- there are situations in which the angle can be considered a flexural extension of the stringers in which case it may indeed be appropriate to consider shear only. We'd need to understand the details of the connection in order to ascertain that though.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Cantilevered bolted angle connection design

Can you provide a sketch?

Dik

RE: Cantilevered bolted angle connection design

(OP)
for a sketch - https://imgur.com/a/i646r . The stringer is a 12x3 HSS - will be welded to angle post erection.

RE: Cantilevered bolted angle connection design

You should consider it, likely not an issue, examples can be found in "Design of Welded Structures" Omer Blodgett, PCI Handbook 7th Ed., AISC design examples V14

RE: Cantilevered bolted angle connection design

Is the stringer prevented from rotation?

Dik

RE: Cantilevered bolted angle connection design

At the proportions that you've sketched, and with the vertical leg down, you may indeed have some serious prying effects. Again though, it depends on where there is restraint in the system. Under the right conditions, one could treat the vertical angle leg as essentially an extension of the vertical wall of the HSS. In that case, a pure shear design might be justified.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Cantilevered bolted angle connection design

I dunno, with that stringer welded to that angle, I think shear is all you're looking at...

If they are welded together so that the angle really is just an extension of the the vertical wall of the HSS as KK says.

RE: Cantilevered bolted angle connection design

That's why I was wondering if rotation was prevented...

Dik

RE: Cantilevered bolted angle connection design

(OP)
yes, the stringer is running against a wall, and will also be secured each end to prevent 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