Thursday, June 14, 2018

THINGS SITE ENGINEERS MUST KNOW ABOUT REINFORCEMENT AND STEEL BARS

A Vision To Clear Solutions.

THINGS SITE ENGINEERS MUST KNOW ABOUT REINFORCEMENT AND STEEL BARS:



  • Clear cover to main reinf orcement in
  • Footings : 50 mm
  • Raft foundation Top : 50 mm
  • Raft foundation Bottom/ sides : 75 mm
  • Strap Beam : 50 mm
  • Grade Slab : 20 mm
  • Column : 40 mm (d>12mm) 25 mm (d= 12mm)
  • Shear Wall : 25 mm
  • Beams : 25 mm
  • Slabs : 15 mm or not less than diameter of the bar.
  • Flat Slab : 20 mm
  • Staircase : 15 mm
  • Retaining Wall on Earth : 20/ 25 mm
  • Water retaining structures : 20 / 30 mm
  • Sunshade (Chajja) : 25 mm
  • Hook f or stirrups is 9D f or one side
  • No. of stirrups = (clear span/Spanning) + 1
  • For Cantilever anchorage length f or main steel is 69D
  • “L” f or column main rod in f ooting is minimum of 300mm
  • Chairs of minimum 12 mm diameter bars should be used.
  • Minimum diameter of dowel bars should be 12 mm
  • Lap slices should not be used f or bar larger than 36 mm.
  • In steel reinf orcement binding wire required is 8 kg per MT.
  • Lapping is not allowed f or the bars having diameters more than 36 mm.
  • Minimum number of bars f or a square column are 4 and f or circular column are 6.
  • Longitudinal reinforcement should not be less than 0.8% and more than 6% of gross C/S.
  • Weight of rod per meter length = d2/162 where d is the diameter in mm
  • All reinf orcement shall be f ree f rom mill scales, loose rust & coats of paints, oil or any other substances.
  • Main bars in the slabs shall not be less than 8 mm (HYSD) or 10 mm (Plain bars) and the distributors not
  • less than 8 mm and not more than 1/8 of slab thickness.
  • In case of spacing of bars
  • Provide the diameter of the bar, if the diameter of the bar are equal.
  • Provide the diameter of the larger bar, if the diameter are unequal.
  • 5mm more than the nominal maximum size of the coarse aggregate.

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