Bar Bending schedule (BBS)
The bar bending schedule is a table that contains the details of reinforcement for a specific structural member such as footing, column, slab, and others. The bar bending schedule will contain the bars' dimensions to be used, the shape of the bars, the size of bars, bar mark, number of bars, and the weight of bars. BBS will be used to determine the weight of reinforcement required for a specific structural member.
there are various advantages of bar bending schedule such as:
- estimating the quantity of reinforcement for each structural member. So we can estimate the amount of reinforcement required for a construction project.
- BBS will help in reducing the losses of steel by procuring the precise quantity of different rebar diameter.
- BBS will reduce the wastage of reinforcement by providing the engineers with the exact dimension and shape of rebars. Knowing the exact dimension and shape will reduce the time of cutting and bending rebars.
- BBS will reduce the effort at the time of billing. Quantities of reinforcement will be calculated and shown in BBS. Therefore the billing of reinforcement for various members will be quick and simple.
- For big projects. The main contractor will not cut and bend the reinforcement. The cutting and bending will be done at the factory. The presence of BBS will reduce the effort and time of cutting and bending reinforcement at the factory.
- The bar marks can help the fabricators in placing the rebars in correct locations. The bar mark usually is shown in the shop drawing, and each bundle of bars will have a tag with a bar mark and detail.
The last step is to calculate the weight of each group of bars. the weight will be calculated using the following equation: