RCC beam reinforcement

EXERCISE :

FIND OUT THE TOTAL WEIGHT OF THE REINFORCEMENT FOR THE RCC BEAM.

  • BEAM SIZE  300 X 600
  • CLEAR SPAN : 4000MM (CLEAR SPAN : INTERNAL DISTANCE BETWEEN COLUMN TO COLUMN)
  • TOP BARS : 2 X 12 T
  • BOTTOM BARS : 4 X 25 T
  • STIRRUPS : 10 T @ 200 C/C
  • COLUMN SIZE : 300 X 300

FOR THIS FIRST WE NEED TO CALCULATE THE CUTTING LENGTHS OF EACH TYPE  OF BAR & STIRRUP.

  • MAIN STEEL : STRAIGHT BARS
  • BEAM SPAN O/O = ( 4000 + 2 X 300 ) = 4600
  • CUTTING LENGTH OF STRAIGHT BARS = 4600 – 2X 25 = 4600 -50 = 4550 MM = 4.55M
  • CUTTING LENGTH OF ANCHOR BARS = SAME AS MAIN BARS = 4.55 M

CUTTING LENGTH FOR THE STIRRUPS :

  • STIRRUP WIDTH =  300 – 2 X 25 = 250 MM
  • STIRRUP  DEPTH = 600  – 2 X 25 = 550 MM
  • STIRRUP PERIPHERY = 2 X 250 + 2X 550 =1600 MM
  • CUTTING LENGTH OF STIRRUP = 1600 + 120 =1720 = 1. 72 M
  • NO OF STIRRUPS = 4000 /200 +1 = 21 NOS
  • REINF.WEIGHT
  • = NOS X CUTTING LENGTH X UNIT WEIGHT OF THAT BAR
  • 1.MAIN BARS ( 25T ) =  4 X 4.55 X 3.86 = 70.252 KG
  • 2.ANCHOR BARS ( 12 T ) =2 X 4.55 X 0.89 =8.10 KG
  • 3.STIRRUPS ( 10 T )          =21 X 1.72 X 0.62 = 22.4 KG
  •  TOTAL WEIGHT = 100.752 KG
  • WT OF REINF. = 100.752 KG
  • BEAM VOLUME =  4.6 X 0.3 X 0.6 = 0.828 CUM
  • WEIGHT OF REINF PER CUM =  100.752 / 0.828 = 121 . 68 KG/ CUM
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