Bar bending schedule
BBS stands for the bar bending schedule. In this process, the bending of reinforcing steel into different shapes required for RCC constructions was noted. This operation is commonly done at the site. In bar bending schedules the cut, bend, bundled and the location of bars are readily determined.
BBS is a list of the reinforcing bars and is represented in a tabular form. This tabular form summarizes all the particulars needed of bars, its diameter, its shape of bending, length and its length of each bent, bending angles, the total length of each bar and the number of every type of bar. The process of making the list of the type of bar, its location, size, length, mark and bending and all other given details is called scheduling.
The (IS: 5525) shows the different recommendations and also make the standard length in the bar length calculation works. The length tolerance is +- 25mm. Bar bending schedule is used as a frame of reference by the steel fixers and then the steel fixers can easily make of the number and kind of reinforcing bars for structural construction.
Importance of BBS
1- It is very important in any RCC construction.
2- The preparation of BBS helps us to determine the steel quantity, its strength and cost estimation.
3- Easy to make the billing of the construction work.
4- We know the weight of the bar of different sizes required for the RCC work.
5- The bar bending schedule gives a clear idea about the cutting length, dimension and number of reinforcing rebars.
6- Bar bending schedule leads to the estimation of the total quantity of steel.
How to prepare a BBS
Ever BBS should have the following necessary details.
1- Bar size/bar mark reference
2- Shape of bar
3- Diameter of bar
4- Spacing of bars
5- Length of bar
6- Cutting length of bars
Advantages of BBS
1- It provides us with the correct and better estimation of reinforcement for each structural member which can be used to determine the required reinforcement.
2- Using the bar bending schedule, it saves us 5 to 10% quantity of steel.
3- It also reduces our construction time and the wastage of steel and cost of steel due to the less requirement of workers for bar bending.
3- Increases the faster execution at the site.
4- BBS can be used for the reinforcement cutting, bending of the structural member before it can be installed at the required position.
5- Bar bending schedule improves the accuracy of bar cutting and bending.
Percentage of reinforcement according to concrete
BBS member % According to the volume of concrete
Column 2.5
Beam 2
Slab 1
Footing 0.8
