180 vs 90 deg. Hooks in Pilecaps
180 vs 90 deg. Hooks in Pilecaps
(OP)
Hello all.....Is there a reason CRSI uses 180 deg. hooks at the bottom of pilecaps? It states, "The provision to include a 180 deg. end hooks or heads on all reinforcing bars in pile caps with single lines of piles around the column is a prudent precaution against a premature "tied-arch" shear failure mode." ACI does not differentiate between 180 & 90 deg hooks.
Wouldn't a 90 deg hook perform the same function?
Wouldn't a 90 deg hook perform the same function?





RE: 180 vs 90 deg. Hooks in Pilecaps
In this application, the bar needs to be developed as close to the edge of the pile cap as possible, and from a practical perspective, 180 degree hooks are capable of developing the full bar capacity in a shorter distance.
John Turner CSP PE
CRSI Greater Southwestern Regional Manager
RE: 180 vs 90 deg. Hooks in Pilecaps