Figure 9 - Reinforcement details for the wall
Reinforcement details for this wall are given in the Figure above. The special transverse reinforcement in the flanges consists of a series of overlapping hoops and supplemental 135-degree crossties, similar to Detail (b) depicted in ACI 318-19 (Figure R18.10.6.4a). The geometry of the overlapping hoops depicted in Detail A of the Figure above satisfies the requirements in ACI 318-19 (18.10.6.4(f)).
Comments. For a construction sequence where (1) a wall is constructed to the underside of the slab, (2) the slab is constructed, and (3) the wall above the slab is constructed, the concrete within the thickness of the slab at the location of the special boundary elements must have a specified compressive strength of at least 0.7 times the specified compressive strength of the wall (ACI 318-19 (18.10.6.4(h)). In this example, the slab in floor levels 1 through 10 must have a minimum compressive strength of 0.7 × 6,000 = 4,200 psi. For a construction sequence where the wall is constructed ahead of the slab (for example, where slip forms are used to construct the wall), this requirement is not applicable.