Standard 90-degree and 135-degree reinforcing bar hook geometries are detailed with minimum extension lengths, bend diameters, and a reference table for bar sizes #3 through #6. The table provides dimension A or G and approximate dimension H for each bar size based on bar diameter d. Notes specify that 135-degree column tie hooks must not be bent smaller than the enclosed vertical bar diameter, and welded wire fabric bend requirements are defined regarding wire size and weld proximity.
D D D D 90° HOOK 135° HOOK DETAILING DIM. A OR G d 6d OR 2ø" MIN. DETAILING DIM. 6d OR 3" MIN. d A OR G H 1 1/2" 2" 2 1/2" NOTES: 135° COLUMN TIE HOOKS MAY NOT BE BENT TO LESS THAN THE DIAMETER OF THE COLUMN VERTICAL BAR ENCLOSED IN THE HOOK. INSIDE DIAMETER OF BEND IN WELDED WIRE FABRIC SHALL NOT BE LESS THAN 4d FOR DEFORMED WIRE LARGER THAN D6 AND 2d FOR ALL OTHER WIRES. BENDS SHALL NOT BE LESS THAN 4d FROM NEAREST WELDED INTERSECTION. D BAR SIZE 90° HOOK 135° HOOK A or G A or G 6" 4 1/2" 4" 5 1/2" 4 1/2" 4 1/4" 3 1/2" 3" 3" #3 #4 #5 H (APPROX.) 4 1/2" 8" 12" 4 1/2" #6 1. 2.
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