Engineer Anas Dawas, I apologize for the inquiry, but I have a question regarding the longitudinal reinforcement of columns or pedestals embedded in footings. Typically, this reinforcement must meet its development length in both compression and tension, and a hook is also added. My question is, what should be the length of this hook? I have often seen a distance of 50 cm in detail drawings, and recently I saw a document that stated the minimum was 45 cm. I would like to know where this dimension comes from, or should we only consider the 90-degree hook, which according to ACI, should be at least 12d? Thank you in advance for your response.
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