THE dead load includes self weight of the structure  and all other superimposed  loads which are paranently attached to  the structures.Such load do not  change  their position and don't vary in magnitude.
The self weight of the structure  being ununknow  beginning of the design,it haes be to assumed by the designer in the light of experience and thumb rules and formula available.
Dead load on a structure is  the weight of the permanent components such as beams, floor slabs, columns and walls. 
2. Dead load = volume of member x unit weight of materials
Unit weight of materials
| Material | Unit weight kN/m3 | 
|---|---|
| Plain concrete | 23.5 | 
| Reinforced concrete | 24 | 
| Glass | 25.5 | 
| Mild steel | 77 | 
| Hardwood | 11 | 
| Softwood | 8 | 
Volume of beam 10.0 x 0.6 x 0.3 = 1.8 m3
Unit weight of reinforced concrete = 24 kN/m3
dead load of beam = volume x unit weight
= 1.8 m3 x 24 kN/m3
= 43.2 kN
 

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