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

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

spaced at %0mm center to center. &lear cover to reinforcement provided 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 above example.

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)e will start with bottom reinforcement, *.

*ar shape of * is as shown below+

Length of B1  clear distance between walls 2 x width of walls " 2 x bar cover 2 x bend

length

*end length ! x ! ! consider as 00mm

*end length is calc$lated as ! x diameter of bar for reinforcement conforming to I/+ %!-!

1ength of * 4000 2 x 230 " 2 x 40 2 x00 45%0mm

1ength 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 x 230 " 2 x 40 .44x " 6

450 " 2 x 40 " 2 x 2 " 2 x 272 334mm

B2 4000 2 x 230 " 2 x 40 .448334 " 3346 45%.3 4520mm

Length of Bar T1  4000 2 x 230 -2 x 40 43%0mm

Length of Stirrups S1:

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/tirr$ps are spaced at %0mm center to center. /tirr$ps are provided between walls or s$pport for a beam.

 'o. of stirr$ps re($ired for given beam

1ength a 450 " 2 x40 " % 3!2mm

1ength b 300 " 2 x 40 " % 22mm

herefore length of stirr$p / 2 x 22 3!2 06 32% 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

* ! 2 45%0 4.5

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2 *2 2 4520 4.02

3 2 2 43%0 .%0

4 / % 24 330 2.!