HOW TO CALCULATE CUTTING LENGTH OF BENT UP BAR IN SLAB

CALCULATION OF CUTTING LENGTH OF BENT UP BAR

Given data:-

  • Diameter of bar - 12 mm
  • Clear cover - 25 mm
  • Clear span - 5000 mm
  • Slab thickness - 200 mm 
  • Development length Ld - 40d


D = slab thickness - (2x clear cover) - (Dia. Of bar)
    = 200 - (2 x 25) - 12
    = 138 mm

CALCULATION:- 

Cutting length of bar =

= Clear span of slab + ( 2xLd) + (2x0.42D) - (1dx4) - (2dx2)
Where,
                1d = 45° & 2d = 90°

= 5000 + (2x40x12) + (2x0.42x138) - (1x12x4) - (2x12x2)

= 5980 mm or 5.98 m

So as per data given we need to cut the main bars of 5.98 m in length.

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