How to calculate beam self weight

Example:

   Beam size = 300mm×450mm

  Beam length = 4.5 m

:. Concrete density = 2400 kg/m cube 

:. Steel density         = 7850 kg/m cube 

Volume of beam = 0.3×0.45×1 m cube 

                               = 0.135 m cube 

    In kg                  = 0.135×2400 kg

                               = 324 kg/m

2% steel provided to the total beam volume 

                               = (2/100)×0.135×7850 kg

                               = 21.19 kg/m

Self weight of beam = 324+21.19 kg/m 

                                      = 345 kg/m 

Total beam self weight = 345×4.5 kg

                                              = 1552.5 kg ans.

Note:according to the practical experience and also according to the IS-456 2000 code more information watch video link below. 

               https://youtu.be/eS7zFyZ3zeM