Standard 135-degree seismic hook and bend geometry for concrete reinforcing bar hoops. Bend diameter D, extension length hook A or G, and horizontal dimension H for bar sizes ranging from number three to number six. A minimum extension of six bar diameters or three inches is required past the bend. Dimensions correspond to standard structural detailing requirements for confinement reinforcement in columns and beams.
BAR SIZE D HOOK A OR G 135 DEGREE HOOK H APPROX. #3 #4 #5 #6 1-1/2" 2" 2-1/2" 4-1/2" 5" 6-1/2" 8" 10-3/4" 3-1/2" 4-1/2" 5-1/2" 6-1/2" OR G HOOK A db D 3" MIN. 6db H
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