Following Are The Steps To Calculate The Quantity Of Steel For RCC Slab:

1- Prepare a bar bending schedule in order to classify different shapes of bars (bent up bar, straight anchor bar, eos bar, curtail bar etc) and diameters.

2- List down all the shapes of bars from the drawing.

3- Count the number of bars of each of those shapes.

4- Then calculate the cutting length of each of those bars.

Cutting length of bar = (length of the member  deduction for cover on both sides) development length.

5- Then calculate the unit weight of each dia bars by the following formula:

W = d^2/162*L

Where d is the diameter in mm and weight (w) in kg, L= total length

6- Then calculate weight of rebar

Weight of rebarno of bars x cutting length x unit weight

7. Add all the weight to get the total steel quantity.

NOTE :

 1- Minimum % Of Steel Are:

1- For  Beam (Teinsion reinforcement):

As = 0.85bd/fy  of gross cross-section area.

2- For Slab = 0.12% of total area

3- For Column = 0.8% of cs area

2- Maximum % Of Steel Are:

1- For Beam = 4 % of cross-section area.

2- For Slab = 4% of cross-section area.

3- For column = 6% of cross-section area.

3 Development Length is usually specified in the drawings, but if not then you can calculate it as,

D.L = Depth – 2 times cover

4Binding wire = 10 grams per kg of reinforcement.

5- No. of stirrups = (length of member – 2 x cover ) / spacing + 1

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