Reinforcement Detailing of Reinforced Concrete Structures
Standard Hooks:
- 180o bend plus an extension of at least 4 bar diameters, but not less than 65 mm at the free end of the bar.
- 90o bend plus an extension of at least 12 bar diameters at the free end of the bar.
- For stirrup and tie anchorage
For 16 mm φ bar and smaller, a 90o bend plus an extension of at least 6 bar diameters at the free end of the bar,- For 19 mm to 25 mm φ bars, a 90o bend plus an extension of at least 12 bar diameters at the free end of the bar,
- For 25 mm φ bar and smaller, a 135o bend plus an extension of at least 6 bar diameters at the free end of the bar,
- For closed ties and continuously wound ties, a 135o bend plus an extension of at least 6 bar diameters, but not less than 75 mm.
Minimum Bend Diameters:

Bending:
Surface Conditions of Reinforcement:
Placing of Reinforcement:
- Reinforcement shall be accurately placed and adequately supported before concrete is placed, and shall be secured against displacement within tolerances permitted in table below,
- Reinforcement shall be placed within the following tolerances unless otherwise specified by the engineer:
- Tolerances for depth d, and minimum concrete cover in flexural members, walls and compression members shall be as set forth in below table
- Notwithstanding the provision of (a) above, tolerance for the clear distance to formed soffits shall be minus 6 mm and tolerance for cover shall not exceed minus 1/3 the minimum concrete cover specified in the design drawings or specifications.
- Tolerance for longitudinal location of bends and ends of reinforcement shall be ± 50 mm, except at discontinuous ends of brackets and corbels, where tolerance shall be ± 13 mm and at discontinuous ends of other members, where tolerance shall be ±25 mm. The tolerance for concrete cover of shall also apply at discontinuous ends of members.
- Welded wire reinforcement (with wire size not greater than MW30 or MD30) used in slabs not exceeding 3 m in span shall be permitted to be curved from a point near the top of slab over the support to a point near the bottom of slab at midspan, provided such reinforcement is either continuous over, or securely anchored at support.
- Welding of crossing bars shall not be permitted for assembly of reinforcement unless authorized by the engineer.
Spacing of Reinforcement:
(b) Bundled bars shall be enclosed within stirrups or ties.
(c) Bars larger than 32 mm φ shall not be bundled in beams.
(d) Individual bars within a bundle terminated within the span of flexural members shall terminate at different points with at least 40db stagger.
(e) Where spacing limitations and minimum concrete cover are based on bar diameter db, a unit of bundled bars shall be treated as a single bar of a diameter derived from the equivalent total area.
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