×
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

Reducing Development Length by 20%

Reducing Development Length by 20%

Reducing Development Length by 20%

(OP)
In ACI 318-05 and also 318-08, Section 12.2.2 commentary, it is stated that "In the development of ACI 318-95, a comparison with past provisions and a check of a database of experimental results maintained by ACI Committee 408 indicated that for No. 6 deformed bars and smaller as well as for deformed wire, the development lengths could be reduced 20 percent using psi s =  0.8."

Am I reading this right, and is anyone doing this, i.e. reducing their development lenghts by 20 percent for No. 6 bars or smaller?  Thanks.

RE: Reducing Development Length by 20%

This is a pretty common reduction.  It's even taken into account automatically in the handy table they give you in 12.2.2 - That is the difference in the coefficients (1/25 compared to 1/20, and 3/50 compared to 3/40).  

RE: Reducing Development Length by 20%

(OP)
Thank you very much, StructuralEIT.  I take it that the 20 percent reduction has already been applied, and that we cannot take any further reduction.

RE: Reducing Development Length by 20%

That is correct if you are using the formulas in the table in chapter 12.  If, however, you use the general equation it will have the psi s term in it.  You will want to use 0.8 for #6 bars and smaller.

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