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onsider a beam of clear length of 4m, 300mm wide by 450mm depth. It consists of 2-12 diameter 

 bars at top, and 2-16 diameter and 1 12 diameter bars at the bottom. !iameter of stirr"p is #mm

spaced at 1#0mm center to center. $lear co%er to reinforcement pro%ided is 40mm.

Fig: RCC Beam Reinforcement Details

Fig: RCC Beam Cross-Section

 &ow we will calc"late the length of reinforcement based on shapes of reinforcement re'"ired for 

reinforced concrete beam in abo%e e(ample.

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)e will start with bottom reinforcement, *1.

*ar shape of *1 is as shown below+

Length of B1  clear distance between walls 2 ( width of walls 2 ( bar co%er 2 ( bend

length

*end length 6 ( 16 6 consider as 100mm

*end length is calc"lated as 6 ( diameter of bar for reinforcement conforming to I/+ 1#6-161

ength of *1 4000 2 ( 230 2 ( 40 2 (100 45#0mm

ength of bar *2 is calc"lated based on shape of this bar. his bar bends "p near the s"pport asshown below+

Length of bar B2+ * $ 4000 2 ( 230 2 ( 40 1.414(

450 2 ( 40 2 ( 12 2 ( 1272 334mm

B2 4000 2 ( 230 2 ( 40 1.4148334 334 451#.3 4520mm

Length of Bar T1  4000 2 ( 230 -2 ( 40 43#0mm

Length of Stirrups S1:

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/tirr"ps are spaced at 1#0mm center to center. /tirr"ps are pro%ided between walls or s"pport for a beam.

 &o. of stirr"ps re'"ired for gi%en beam

ength a 450 2 (40 # 362mm

ength b 300 2 ( 40 # 212mm

herefore length of 1 stirr"p /1 2 ( 212 362 0 132# mm

)here 0mm is the minim"m hoo9 length as per I/ 2502 able II.

Bar Bending Schedule for RCC Beam:

o! Bar

"ar# 

Bar dia

$mm%

o! of 

bars

Length

$mm%

&eight

of bars

$#g%

Bar Shape

1 *1 16 2 45#0 14.5

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2 *2 12 1 4520 4.02

3 1 12 2 43#0 .#0

4 /1 # 24 1330 12.6