(b) The additional length (la) that is introduced in the simple, straight end-to-end length of a reinforcement bar due to being bent up at say 30 o to 60 o, but it is generally 45 o) = l 1 – l 2 = l a (a) Length of one hook = (4d ) + – where, (4d+ d ) refers to the curved portion = 9d. This information is a great help in preparing an estimate of quantities.Ĭalculation of Reinforcement Shape, Cutting and Bending Lengthsįigure 1 depicts the shape and proportions of hooks and bends in the reinforcement bars – these are standard proportions that are adhered to: Table of bar bending schedule summarizes all the needed particulars of bars - diameter, shape of bending, length of each bent and straight portions, angles of bending, total length of each bar, and number of each type of bar. □ Reading time: 1 minute Preparation of Bar Bending Schedule (BBS)īar bending schedule or schedule of bars (BBS) is a list of reinforcement bars for a given reinforced concrete work item, and is presented in a tabular form for easy visual reference.
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