As Per Indian Guidelines Only.
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 : 20 / 30 mm
Sunshade (Chajja) : 25 mm
Hook for stirrups is 9D for one side
No. of stirrups = (clear span/Spanning) + 1
For Cantilever anchorage length for main steel is 69D
“L” for column main rod in footing 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 for bar larger than 36 mm.
In steel reinforcement binding wire required is 8 kg per MT.
Lapping is not allowed for the bars having diameters more than 36 mm.
Minimum number of bars for a square column are 4 and for 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 reinforcement shall be free from 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.
Things Site Engineers Must Know
Check out the Unit Weights and Conversion which will be required on construction site here
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If you have a query, you can ask a question here.
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How bending moment and shear forces can resist structural design.
really nice site..visited for the 1st tim and learned a lot…
i have question for u guys. why do we use only round steel bar why can n’t we use rectangular bar ????
due to better workability
i am grateful to you
why we use main bar in shorter span & distributor bar in longer span
Really very fabulous site
why for slab the minimum diameter bar are 10? i think it shall be larger dia.
that is why you have the word minimum. it can be larger than 10mm but cannot be smaller. but it still depends on the load it is designed to carry
At foundation.what is different between steel bars short direction and steel bars long direction.?
how to find area of steel in rectangular R CC beam
what r the types of reinforcement used in india, its composition
One of our engineer is designed a foundation Size of 180x180x50cm and the steels are 13 nos of 14mm dia bars/mtr both ways at bottom and 13 nos of 12mm bars/mtr at top..
actually i need to know the maximum numbers of bars in one meter.
Note it is a cold store structure of height 9.00mtr.
Am very much grateful to have this important information…pls forward more civil working details to my mail.yours sincerely
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IT,S OK
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how to calculate bbs of cloumn