Preparation of Bar Bending Schedule
Bar bending schedule (or schedule of bars) is a list of reinforcement bars, vis-à-vis, a given RCC work item, and is presented in a tabular form for easy visual reference. This table 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. This information is a great help in preparing an estimate of quantities.
Figure 1 depicts the shape and proportions of hooks and bends in the reinforcement bars – these are standard proportions that are adhered to:
(a) Length of one hook = (4d ) + [(4d+ d )] – where, (4d+ d ) refers to the curved portion = 9d.
(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 ø⁰ say 30o to 60o, but it is generally 45o) = l1 – l2= la
Where,
Fig: Hooks and bends in Reinforcement
Giving different values to Ø (=30⁰, 45⁰ and 60⁰ respectively), we get different values of la, as tabulated below:
Figure 2 presents the procedure to arrive at the length of hooks and the total length of a given steel reinforcement.
Fig: Typical Bar Bending Schedule
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ReplyDeleteAngular adapting to the 50D laping any size of steel extended to the bar laping
ReplyDeleteExcellent post — the step-by-step explanation of preparing a Bar Bending Schedule (BBS) is very clear and practical. I especially appreciate how it breaks down bar sizes, shapes, lengths, and quantities, making it easier for engineers and site supervisors to follow. For anyone looking for Bar Bending services in Hyderabad, posts like this provide valuable guidance to understand the process and ensure accurate reinforcement work.
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