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How to calculate the total load over the RCC footings?/ Calculating the superimposed & dead load over the RCC footing.

 Let us calculate the total load over the RCC footing RF1 as shown below.




Calculation:

1. The dead load of the brick wall over PB2

 = [unit weight × (volume of the wall)]

= [unit weight × (length × depth × thickness )]

Here,

Length = [Total span of slab - (2nos.× column length)]

           = [3000mm. -  (2nos.× 450mm.)]

           = 2100mm. = 2.1m.

Depth = 2700mm. = 2.7m.

Thickness = 230mm. = 0.23m.

The dead load of the brick wall over PB2

= [ 1920 kg/cum. × (2.1m × 2.7m. × 0.23m.) ]

= 2503.87kg.

Also, read  👉👀 How to calculate the dead load of the brick wall?


2. The dead load of the brick wall over PB1

Here,

Length = [Total span of slab - (2nos.× column length)]

           = [4500mm. -  (2nos.× 450mm.)]

           = 3600mm. = 3.6m.

Depth = 2700mm. = 2.7m.

Thickness = 230mm. = 0.23m.


The dead load of the brick wall over PB1

 = [unit weight × (volume of the wall)]

= [ 1920 kg/cum. × (3.6m. × 2.7m. × 0.23m.) ]

= 4292.35 kg.


3. The total load over the plinth beam PB1

= [self wt. of PB1 + a dead load of the wall over PB1]

 = [ 1164.38kg. + 4292.35kg]

= 5456.73 kg.

Note: The self-wt. of the plinth beam is taken from the article 👇

👀 How to calculate the self-weight of RCC footings & plinth beams?


3. The total load over the plinth beam PB2

= [self wt. of PB2 + a dead load of the wall over PB2]

 = [ 776.25kg. + 2503.87kg]

= 3280.12 kg.


4. Self wt. of stub column

 = [unit weight × (volume of the stub column)]

Here,

Depth of stub column = 1000mm. = 1m.

Sectional dimension of stub column = 230mm. × 450mm.

                                                           = 0.23m. × 0.45m.

Self wt. of stub column

= [ 2500kg/m³  × ( 0.23m. × 0.45m.  × 1.0m.)]

= 258.75 kg.


Now,

Total load over the RCC footing RF1

= [{Load transferred from column C1} + {1/2 × ( Load from PB1 + load from PB2)} + DL of stub column + Self wt. of footing]

= [ {68.706 × 101.97 } + {1/2 × ( 5456.73 + 3280.12)} + 258.75 + 476]

= [ 7005.95 + 4368.43 + 258.75 + 476 ]

= 12109.13 kg

= 118.75 KN.

( As 101.97kg = 1KN)

Note: The total load from the column C1 is taken from the article 👇

👀  How to calculate the total load over the columns?

The self-wt. of the footing is calculated in a separate article  👇

 👀  How to calculate the self-weight of RCC footings & plinth beams?


Factored load over the RCC footing RF1

= [118.75 × 1.5]

= 178.12 KN


Thank you for going through these calculation steps. Have a good day 😄.

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