Bar Bending Schedule(BBS)

INTRODUCTION

Bar Bending Schedule is a summary of the reinforcement in a tabular formm which includes the following information. Bar bending schedules are very important out of detailing and should give the following  information:

• Identification of the structural member(s),

• Position of the bars in the structure,
• The bar mark,
• The diameter or size of bar,
• The number of bars of one type in each structural member,
• The total number of bars of each type,
• The total straight length of the bar,
• The shape and bending dimensions of the bar,
• The details of bar chairs can also be included,
• Remarks, if any.

The Various Standard Size of round steel Bars along with Their weight are Shown in Table.

Diameter of Bars	Weight of Bar(kg/m)
6	0.22
8	0.39
10	0.62
12	0.89
14	1.2
16	1.58
18	2
20	2.47
22	2.98
25	3.85
28	4.84
32	6.32
36	8
40	9.87

Measurementof Bending Dimensions 

of Bars For R.C.C.

SAMPLE OF  BBS

Numerical Examples :

 BEAM

CALCULATION 

Longitudinal bar:

L= total length-clear cover+hook

   =6000-2*25+9*16*2

    =5662mm

Stirrup:

   =2a+2b+Hook

    a=depth-clear cover -Dia of bar

   b=width-clear cover -Dia of bar

     a=300-2*25-2*8

        =234mm

b=200-2*25-2*8

        =134mm

hook= 2*12*8

        =192mm

No of Stirrup= (distance/spacing )+1

                    =(5600/100)+1

                     =57 No

Reference:

• is.sp.34.1987 Handbook on Concrete Reinforcement and Detailing

• is.2502.1963Code of Practice for Bending and Fixing of Bars for Concrete Reinforcement

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