HOW TO CALCULATE WEIGHT OF STEEL BARS (EXPLANATION OF D²/162)

HOW TO CALCULATE WEIGHT OF STEEL BARS

• WHAT IS DIFFERENCE BETWEEN PLASTERING AND POINTING

We know that

Density of steel :- 7850 kg/m³  

Cross sectional area of steel bars :- (π/4) d²

Where  d :- diameter of bar

• HOW TO CALCULATE NUMBER OF BRICKS IN A WALL

Note :- we use diameter of bar in ‘mm’ but the density given in kg/m³ . So we require to convert the cross sectional area formula according to this.

              A   =  (π/4) d² mm²    (d is in mm)

=(π/4) d²×(1/10⁶)

           =(3.14×d²)/(4×10⁶ ) m²

                                             A =  d²/(1.273885×10⁶ )  m²  (but ‘d’ is in mm)

• HOW TO CALCULATE QUANTITY OF CEMENT SAND IN PLASTER

Weight per meter of steel bar =A×density of steel

                               = (d²×7850)/(1.273885×10⁶) kg/m

=(d²/162.2)  kg/m

=(d²/162) kg/m

• WHAT IS THE DIFFERENCE BETWEEN ONE WAY SLAB AND TWO WAY SLAB

Example:-

 weight of 25 mm steel bar:-

=(25²/162)  kg/m

  =3.858 kg/m

• MECHANICAL PROPERTIES OF MATERIALS

Weight of 12 mm steel bar :-

=(12²/162)  kg/m

  =0.889 kg/m