×
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

Prying action

Prying action

Prying action

(OP)
Does a second line of bolts (a second Gage) help for prying action on a "T" or single angle hanger, or is prying checked on the first bolt only?

RE: Prying action

First bolt only. The first bolt would have to elongate to engage the second bolt. The mathematical models used in the literature ignore the outer bolt for tension.

RE: Prying action

Intuitively, I would think the 2nd row of bolts would help greatly. Though I do not have any literature to back up my claims.... I may try to research it over the next few days as I have an application for the same scenario. So, far I have been conservatively using the same prying formulas as single rows of bolts. But, it would be nice to find a more definitive source on the subject.

RE: Prying action

Kulak discusses this in “Guide to Design Criteria for Bolted and Riveted Joints.” The conclusion is that the flange has to be sufficiently thick and/or stiffened to fully engage the outer bolt. How thick is sufficiently thick? That's a good question.

RE: Prying action

After some very cursory investigation of the issue, I have changed my stance. I don't think the outer bolts are going to help all that much. Unless, as nutte / Kulak says, the flange is pretty thick.

RE: Prying action

NitinPandharkar:
How much can prying affect a second row of bolts, unless it has literally started to fail the first row of bolts? Worry about the bolts nearest the load application. If the plate were thick enough (stiff enough) you might start to get prying action which was proportional to the plate thickness and the distances from the load, i.e. the plate deflection under these loads. This leads to an additional stretch and bending action under the head of the bolt.

RE: Prying action

Every bolts rows unedr tension should be checked for the development of prying forces. Prying forces occur when the steel plate thickness is weaker than the bolts. Prying forces reduce the tensile resistance of bolts and their existence should be almost always checked if the bolt is subjected to tensile loads.

Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis

http://www.engissol.com/cross-section-analysis-des...

RE: Prying action

(OP)
Hi Guys ...
Thanks you for all your replies.
Suppose I am doing a clip angle connection for beam & column junction. Beam is connected with column web or flange & clip angle is having two bolts in vertical row for connection to column flange or web. In this condition bolt in second row will experience additional tension due to prying or not ?
If any one is having literature on this please upload.

Thanks & Regards,
Nitin

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