Reinforcing bar geometry standards show required bend diameters, hook extensions, and detailing dimensions for standard stirrups and ties. The 135 degree bend configuration incorporates a 6db extension with a 3-inch minimum, while number 6 through number 8 bars use a 12db extension. The 90 degree bend configuration details the inside diameter D, bar diameter db, and total extension dimension A.
A DETAILING DIMENSION db 6db (3" MIN) D H DETAILING DIMENSION D D A db OR FOR #6, #7, #8 - 12db 135 DEGREE BEND 90 DEGREE BEND
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