×
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

ACI 318 Appendix D D.6.2.1 (Avco)

ACI 318 Appendix D D.6.2.1 (Avco)

ACI 318 Appendix D D.6.2.1 (Avco)

(OP)
Per D.6.2.1(b) shear force perpendicular to the edge on group of anchors is Vcbg = Avc/Avco*(********)Vb

where Avco is the projected area for a single anchor in a deep member with a distance from edges equal or greater that 1.5Ca1 in the direction perpendicular to the shear fore.

Avco=4.5(Ca1)^2  (D-23)

In my example, I have a 17" square column with four (4) anchor bolts, each bolt is 6" from each side and 5" apart. So, the Ca1 = 6", thus I can not use formula (D-23). Should I calculate Avco based on my actual parameters or still use formula (D-23).

RE: ACI 318 Appendix D D.6.2.1 (Avco)

Hi Dimitry,
You will still use D-23. This is just the formula to calculate the projected area for concrete breakout of a single anchor in shear. When you divide the actual breakout area (Avc) by the breakout area of a single anchor (Avco) it takes into account all of the adjustments for edge distances and depth restrictions. What your finding is how many idealized anchors you actually have. If you are designing for only one anchor, and you have no edge restrictions, the ratio of Avc/Avco = 1.If you have 2 anchors spaced at 3*Ca1 with no bottom or edge restrictions your ratio would = 2. If you are desiging 1 anchor and you have an edge or depth restriction Avc/Avco will be less than 1.

Try playing around with Hilti's Profis Program. I know Powers Fasteners just updated their PDA program but I'm not as familiar with theirs yet. Good Luck.

Clarke Engineering Services, PC
Jobsite Engineering and Consulting
www.anchorengineer.com

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