Lap splices for #14 rebars
Lap splices for #14 rebars
(OP)
ACI 318-11, section 12.14.2.1 does not permit lap splices for bars larger than #11. The commentary says it's because of lack of experimental data on lap splices for #14 and #18 bars.
We are designing a pile supported mat, 5'-6" thick with a clear cover of 9" to the bottom bars.
Are splices for #14 bars permitted by other (country) codes in situations where clear cover to rebars is in the range of 8" to 9"?
We are designing a pile supported mat, 5'-6" thick with a clear cover of 9" to the bottom bars.
Are splices for #14 bars permitted by other (country) codes in situations where clear cover to rebars is in the range of 8" to 9"?





RE: Lap splices for #14 rebars
RE: Lap splices for #14 rebars
and therefore a clear cover of 9".
RE: Lap splices for #14 rebars
RE: Lap splices for #14 rebars
RE: Lap splices for #14 rebars
And for positive bending you typically like to have the bottom bars extend far enough to be effective in tension due to mat arching action (deep beam theory).
RE: Lap splices for #14 rebars
I have attached a file showing calculations for development length for #14 rebar for the project. The edge of the mat from the centre line of piles is 4'-0" minimum. Although the sketch shows overlaps @ 12" o.c., alternate bars could be spliced, thus increasing the c/c distance of the bars being developed to 24" o.c. (staggering of splices)
The bars are being developed on either side of a given section. The overlap shall be 2 * development length = 2 * 38" = 76" = 6'-4". It does not seem to be too large theoretically.
ACI 318 -05, R7.6.6.4 - Bundling of bars - Commentary : A limitation that bars larger than #11 not be bundled in beams or girders is a practical limit for application to building size members. The Standard Specifications for Highway Bridges permits two-bar bundles for #14 and #18 bars in bridge girders. I am not familiar with bridge design. Does the standard cited above permit bundling of #14 rebars using splices?
RE: Lap splices for #14 rebars
Thank you all once again.
RE: Lap splices for #14 rebars
If I got paid for every hour I worked, I'd be a wealthy man.