ACI Wall Piers

[EngineerRam]

Hi,

I am working on a project which will have many wall piers (ACI definition). Lw/Bw for these wall piers is less than 2.5, so the alternative requirements of 18.10.8.1 do not apply. This section references 18.7.4, 18.7.5, and 18.7.6. 18.7.5.3 calls out the maximum spacing of confining reinforcement for columns. The wall pier is 8" in thickness, so if I were to follow the letter of the code, I would need ties at 2" o.c. (1/4 minimum dimension of the column). This to me seems like overkill for a wall pier with a maximum DC of 45%, even when considering Mpr. Does anyone know if there is something else in the code that would allow me to disregard the thickness of the wall pier?

 

[HTURKAK]

The stringest case is SPECIAL WALL TYPE mandatory req. for SDC D,E, and F .

Pls look ACI 318 - 19

18.10.6.4 If special boundary elements are required by
.......
(e) The boundary element transverse reinforcement shall
satisfy 18.7.5.2(a) through (d) and 18.7.5.3, except the
transverse reinforcement spacing limit of 18.7.5.3(a)
shall be one-third of the least dimension of the boundary
element. The maximum vertical spacing of transverse
reinforcement in the boundary element shall also not
exceed that in Table 18.10.6.5(b).
...
So , you would need ties at ( 2+2/3)'' o.c. (1/3 minimum dimension of the column , 8 in.)


According to the grace of God which is given
unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. . . .
I Corinthians 3:10