THINGS SITE ENGINEERS MUST KNOW ABOUT REINFORCEMENT AND STEEL BARS

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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.