Standard hook and tie details provide bending dimensions for reinforcing bars in concrete structures. A ninety-degree hook tie or stirrup specifies a bend diameter D equal to six times the bar diameter for number five or smaller bars, or twelve times the bar diameter for number six to eight bars. A one-hundred-thirty-five-degree hook tie or stirrup requires a six times bar diameter extension for number eight or smaller bars. A one-hundred-thirty-five-degree seismic stirrup or tie requires an extension of six times the bar diameter or three inches minimum. Ties and stirrups list specific diameter dimensions ranging from one and one-half inches for number three bars up to four and one-half inches for number six bars. General notes specify that all bends shall be made cold and number fourteen and eighteen bars shall be bend-tested and approved prior to bending.
D = 6d FOR #3 THRU #8 D = 8d FOR #9 THRU #11 D = 10d FOR #14 THRU #18 NOTES: 1. ALL BENDS SHALL BE MADE COLD. 2. #14 AND #18 BARS SHALL BE BEND-TESTED AND APPROVED PRIOR TO BENDING. 6d AT #5 OR SMALLER BARS OR 12d AT #6 TO #8 BARS 6d AT #8 OR SMALLER BARS TIES AND STIRRUPS ONLY: #3 : D = 1 1/2" #4 : D = 2" #5 : D = 2 1/2" #6 : D = 4 1/2" 6d OR 3" MIN 90° HOOK TIE OR STIRRUP 135° HOOK TIE OR STIRRUP 135° HOOK SEISMIC STIRRUP / TIE . . . D D D 8 STANDARD HOOK AND TIE DETAILS
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