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Section 12.5 Development of Standard Hooks in Tension

Basic development length lhb is calculated as 100 d b / f ′ c but not less than 8db or 150 mm as per section 12.5.1. For sections with multiple concrete strengths, the minimum concrete strength is used in this calculation.

The development length lhb is calculated by multiplying basic development length lhb by appropriate modification factor. The modification factor is calculated as follows:

Description Modification Factor
Bars with Fy other than 400 Mpa Fy/400
As per Fig A and B 0.7
Reinforcement excess of that required by analysis A s required /A s provided
Low Density concrete 1.3
Epoxy-coated reinforcement 1.2
  1. 35 mm or smaller bars with side cover of 60 mm or larger

  2. The cover for 90° hooks is greater than or equal to 50 mm

  3. The spacing between vertical or horizontally enclosed hooks is ≤ 3db

Modification factors for hooked anchorages

Parent topic: CAN/CSA A23.3-10 Code Implementation