×
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

Appendix D - Breakout in Shear

Appendix D - Breakout in Shear

Appendix D - Breakout in Shear

(OP)
For concrete breakout in shear, anchor near edge and load towards edge, D.6.2.1 gives Avco = 4.5 x Ca1^2 and notes in the text "for a deep member". Fair enough. D.6.2.4 deals with anchors in sections of limited thickness such that "both edge distances ca2 and ha are less than 1.5ca1". What about thin members, i.e. slabs, where ha < 1.5ca1 but there is infinite edge distance for ca2? It would seem that the vertical portion of the area calc gets capped at member thickness, h. So it would be Avco = (2 x 1.5ca1) x h.

Although it doesn't state the above anywhere it seems to make sense and goes along with the diagrams/derivations. However when I run this in Hilti Profis I see that they're using the ca1^2 and therefore getting a huge area. Maybe a mistake in profis - or am I missing something?

ACI does address this exact configuration for the group of anchors in figure .6.2.1(b) where they cap the height at "h" which would seem to confirm my way of doing it. Profis does seem to follow this diagram for the group.

RE: Appendix D - Breakout in Shear

bookowski - are you confusing Avc with Avco? Avc is calculated based on geometry of actual condition. Fig RD.6.2.1(b) is reflecting Avc calculation. Avco is an idealized condition for a single anchor - this term will end up in the denominator of equation D-31.

RE: Appendix D - Breakout in Shear

(OP)
Yeah I guess so. Avco is for anchor "unaffected by edge distance, spacing, or depth of member". What threw me was that they say the above but then there is an exception for spacing and depth in d.6.2.4 where they show modifying Avco for thin members. So it's independent of spacing and depth except when it is.

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