Reinforcing bar tie lap details define the required splice lengths and hook dimensions for structural columns and girders. The lap length is specified as one foot eight inches for number four bars, two feet two inches for number five bars, and two feet seven inches for number six bars. Standard hook geometry includes a twelve bar diameter extension for ninety-degree bends and a four bar diameter or two-and-one-half-inch minimum extension for one-hundred-eighty-degree bends.
TIE LAP AT FRAME COL AND GIRDERS 1'-8" FOR #4 2'-2" FOR #5 2'-7" FOR #6 d . 4d OR 2 1/2" MIN d 12d D D
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