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25.7.1.1
Stirrups shall extend as close to the compression and tension surfaces of the member as cover requirements and proximity of other reinforcement permits and shall be anchored at both ends. Where used as shear reinforcement, stirrups shall extend a distance d from extreme compression fiber.
25.7.1.2
Between anchored ends, each bend in the continuous portion of a single or multiple U-stirrup and each bend in a closed stirrup shall enclose a longitudinal bar or strand.
25.7.1.3
Anchorage of deformed bar and wire shall be in accordance with (a), (b), or (c):
(a) For No. 5 bar and D31 wire, and smaller, and for No. 6 through No. 8 bars with fyt ≤ 40,000 psi, a standard hook around longitudinal reinforcement
(b) For No. 6 through No. 8 bars with fyt > 40,000 psi, a standard hook around a longitudinal bar plus an embedment between midheight of the member and the outside end of the hook equal to or greater than 0.014dbfyt/(λ ), with λ as given in Table 25.4.3.2
(c) In joist construction, for No. 4 bar and D20 wire and smaller, a standard hook
25.7.1.4
Anchorage of each leg of welded wire reinforcement forming a single U-stirrup shall be in accordance with (a) or (b):
(a) Two longitudinal wires spaced at a 2 in. spacing along the member at the top of the U
(b) One longitudinal wire located not more than d/4 from the compression face and a second wire closer to the compression face and spaced not less than 2 in. from the first wire. The second wire shall be permitted to be located on the stirrup leg beyond a bend, or on a bend with an inside diameter of bend of at least 8db.
25.7.1.5
Anchorage of each end of a single leg stirrup of welded wire reinforcement shall be with two longitudinal wires at a minimum spacing of 2 in. in accordance with (a) and (b):
(a) Inner longitudinal wire at least the greater of d/4 or 2 in. from d/2
(b) Outer longitudinal wire at tension face shall not be farther from the face than the portion of primary flexural reinforcement closest to the face
25.7.1.6
Stirrups used for torsion or integrity reinforcement shall be closed stirrups perpendicular to the axis of the member. Where welded wire reinforcement is used, transverse wires shall be perpendicular to the axis of the member. Such stirrups shall be anchored by (a) or (b):
(a) Ends shall terminate with 135-degree standard hooks around a longitudinal bar
(b) In accordance with 25.7.1.3(a) or (b) or 25.7.1.4, where the concrete surrounding the anchorage is restrained against spalling by a flange or slab or similar member
25.7.1.6.1
Stirrups used for torsion or integrity reinforcement shall be permitted to be made up of two pieces of reinforcement: a single U-stirrup anchored according to 25.7.1.6(a) closed by a crosstie where the 90-degree hook of the crosstie shall be restrained against spalling by a flange or slab or similar member.
25.7.1.7
Except where used for torsion or integrity reinforcement, closed stirrups are permitted to be made using pairs of U-stirrups spliced to form a closed unit where lap lengths are at least 1.3d. In members with a total depth of at least 18 in., such splices with Abfyt ≤ 9000 lb per leg shall be considered adequate if stirrup legs extend the full available depth of member.

Related Code Sections

25.7.1 Reinforcement Details, Stirrups
Stirrups shall extend as close to the compression and tension surfaces of the member as cover requirements and proximity of other reinforcement ...
25.7.1 Reinforcement Details, Stirrups
Stirrups shall extend as close to the compression and tension surfaces of the member as cover requirements and proximity of other reinforcement ...
25.7.1.1 Reinforcement Details,
Stirrups shall extend as close to the compression and tension surfaces of the member as cover requirements and proximity of other reinforcement ...