Basic reinforcement knowledge for site engineers
Basic reinforcement knowledge for site engineers Re: Deduction in length of reinforcement steel for bar bending Answer # 1 For 45 degree bend deduct 1d. For 90 degree bend deduct 2d. d= dia of bar. Re: how can we calculate cutting length of a column ring (300 x 600) Answer # 1 Cutting Length of a column Formula = 2(L+B)+20d-2x10d So, L=600-80=520mm B=300-80=220mm Cutting Length = 2 (520+220) + 10x8 = 2(740)+80 = 1480+80=1560 mm if we Assume that the dia of ring is 8mm. T hings Site Engineers Must Know About Reinforcement and Steel Bars Clear cover to main reinforcement 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