A seismic stirrup or tie features a 135-degree hook with a bend diameter D equal to six bar diameters for number three through number eight bars, eight bar diameters for number nine through number eleven bars, and ten bar diameters for number fourteen through number eighteen bars. The free end extension measures six bar diameters or three inches minimum.
D = 6d FOR #3 THRU #8 D = 8d FOR #9 THRU #11 D = 10d FOR #14 THRU #18 6d OR 3" MIN 135° HOOK SEISMIC STIRRUP / TIE . D
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