×
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

Lap Splice From Footing to CMU Wall Filled Solid
6

Lap Splice From Footing to CMU Wall Filled Solid

Lap Splice From Footing to CMU Wall Filled Solid

(OP)
IBC 2000 has an equation #21-22 on pg.499 and eq.#21-25 on pg.506 for lap splices in masonry. Is this actually the same for a rebar dowel from a concrete footing to a cmu wall filled solid with concrete?? What ever happen to the typical 48 bar diameters??

RE: Lap Splice From Footing to CMU Wall Filled Solid

4
It looks like the 10-significant digit accuracy people that wrote ACI 530 considered every possible variable, short of the gravitational pull of the moon, to come up with the masonry lap splice calculation.
The old 48 bar diameters a la UBC just was an approximation, and won't fly any more.

RE: Lap Splice From Footing to CMU Wall Filled Solid

2
The IBC equation gives fairly similar results to the tried and true 48db up through number 5 bars.  It severely punishes you for using bars larger than no. 5s and it is therefore advisable to use smaller bars and closer spacing to avoid this problem.  Utilizing typical assumptions (8in wall - rebar in center - 1500psi compressive strength block) the following laps can be found:

Rebar Size   IBC Eqn   48db
3             19       18
4             25       24
5             31       30
6             57       36
7             79       42
8            112       48
9            146       54

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