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Bolt Bearing in a Shear Connection
5

Bolt Bearing in a Shear Connection

Bolt Bearing in a Shear Connection

(OP)
The Canadian steel code S16 allows for bearing equal to:

3 x ϕbr x n x t x db x Fu

where ϕbr is 0.8
n is number of fasteners
t is the thickness
db is the bolt dia
Fu is the UTS

I couldn't find anywhere that clarifies that this is the bearing material and not the bolt, and why would the value be so relatively high? I assume the AISC has something similar.


Dik

RE: Bolt Bearing in a Shear Connection

Check the Fu, I believe it refers to the base metal, not the bolt.

RE: Bolt Bearing in a Shear Connection

(OP)
Thanks... Fu is also referenced with bolt strength, too... the reason for the conclusion. That was my original understanding... I was just wondering.

Dik

RE: Bolt Bearing in a Shear Connection

AISC has 3 equations for bearing strength of bolt connection, and "Fu = minimum tensile strength of the connected material, ksi"

RE: Bolt Bearing in a Shear Connection

(OP)
Thanks...

Dik

RE: Bolt Bearing in a Shear Connection

You are welcome.

RE: Bolt Bearing in a Shear Connection

Dik, as to the why. The following excerpt explains the logic. Not Canadian specifically, but similar logic would have applied in determining your coefficient of 3.

RE: Bolt Bearing in a Shear Connection

(OP)
Thanks, Agent... I guess the 3 is not excessive.

Dik

RE: Bolt Bearing in a Shear Connection

Yeah, I guess if you Google images of bearing failures you'll see there is a lot of deformation occuring to get to that limit state. The piling up of the material referenced is expected. So it is never intended to be an elastic (recoverable) phenomenon.

If you're after a "more" elastic approach I believe following the advice for 'pins' in any code is more appropriate.

For example see below from NZ code, Canada likely has similar provisions for pins. You'll note it is based on yield strength and lower factor overall.


RE: Bolt Bearing in a Shear Connection

Agent666:
RE: your last two posts, very nicely done and explained. That’s about what I remember as an explanation and the way of dealing with bolts and pins, although I don’t have copies of those two stds. which you show copies of.

RE: Bolt Bearing in a Shear Connection

(OP)
Thanks, again Agent... much appreciated and the explanation was great. Is that an AISC commentary?


Dik

RE: Bolt Bearing in a Shear Connection

I think it is from the NZ code, dik.

BA

RE: Bolt Bearing in a Shear Connection

No problem :). The screenshots are specifically from the New Zealand Steel code, NZS3404:1997.

The concepts involved in international codes are all based on similar research, whether it's a 3 or 3.2 factor the concept, reasoning and intent is similar.

The reference 9.12 mentioned in the first post/first screenshot is the following publication, which goes through it in a lot more detail and compares various international codes of the time and research on the subject (late 1970's) from an Australasian perspective.






RE: Bolt Bearing in a Shear Connection

(OP)
Thanks Bart...and Agent


Dik

RE: Bolt Bearing in a Shear Connection

Dik,

Screenshot of CSAS16-14

RE: Bolt Bearing in a Shear Connection

(OP)
Thanks Jayrod... had that... but thought the values were too high and wasn't sure if they were referring to the Fu of the bolt, or the base metal. For screenshots, do you use <Win><Shift><S>?

Dik

RE: Bolt Bearing in a Shear Connection

<Shift><PrtSC> on my keyboard, then paste onto Paint for crop and edit.

RE: Bolt Bearing in a Shear Connection

dik,

I use <win><shift><S> to get the image on the clipboard, but can't paste directly to the E-T file. Must create a pgn or jpg file and use the image tool to get it on E-T.

BA

RE: Bolt Bearing in a Shear Connection

I do use win shift S.

Then click the image button and click within the area that says drop file here. then I ctrl-v. all done.

Isn't the Fu of the bolt material generally higher? Except for A307 which are only allowed for wood connections and anchor bolts.

RE: Bolt Bearing in a Shear Connection

How about that...it works.

BA

RE: Bolt Bearing in a Shear Connection

And they say they can't teach old dogs new tricks. They've never met BA or Dik before obviously.

RE: Bolt Bearing in a Shear Connection

(OP)
Retired13:

Quote (<Shift><PrtSC> on my keyboard, then paste onto Paint for crop and edit.)


with <Win><Shift><S> you can eliminate a couple of steps... by immediately capturing the 'snapshot' you want. Forgot to add that you can capture parts of *.pdf documents that you normally couldn't access with pdf 'snapshot'.

Dik

RE: Bolt Bearing in a Shear Connection

(OP)

Quote (And they say they can't teach old dogs new tricks. They've never met BA or Dik before obviously.)


I don't know about Bart... but, I'm not that old... still active in engineering after 50 years.

Dik

RE: Bolt Bearing in a Shear Connection

Dik,

Thanks for the tip. But I still have to drop it to another program to be able to upload to the forum. Can you directly paste to E-T?

RE: Bolt Bearing in a Shear Connection

Quote (dik)

still active in engineering after 50 years.
Longer than a bulk of us members have been alive.

Quote (retired13)

Can you directly paste to E-T?

Yes by doing exactly what I described to BA above

Quote (Jayrod12)

I do use win shift S.

Then click the image button and click within the area that says drop file here. then I ctrl-v. all done.

RE: Bolt Bearing in a Shear Connection

If you've been engineering for 50 years, dik, some would say you're getting a bit long in the tooth.

BA

RE: Bolt Bearing in a Shear Connection

(OP)
retired13:



See jayrod's post above...

Dik

RE: Bolt Bearing in a Shear Connection



This is the step I failed. After copy, I got an editing window without the ability to paste to E-T, but another program. I guess I screwed on the "image button", which button is that?

RE: Bolt Bearing in a Shear Connection

RE: Bolt Bearing in a Shear Connection

Ah ha. Thanks. Another old dog joining the rank now :)

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