Calculating the total load over a Reinforced Cement Concrete (RCC) slab is essential for structural stability. This guide explains step-by-step how to determine an RCC slab’s dead load and live load.
Given Data
- Length of slab: 4500mm = 4.5m
- Width of slab: 3000mm = 3.0m
- Slab thickness: 125mm = 0.125m
Total Load Over the Slab
The total load over the slab is the sum of the dead and live load.
1. Dead Load Calculation
The dead load consists of the slab’s self-weight and the floor finish.
a. Self Weight of Slab
Formula:
Self weight = Volume x Density
= (Length x Width x Thickness) x 25KN/m³
= (4.5m x 3.0m x 0.125m) x 25KN/m³
= 1.6875m³ x 25KN/m³
= 42.19KN
b. Floor Finish Load
Formula:
Floor Finish Load = Area x Weight per m²
= (Length x Width) x 1.5KN/m²
= (4.5m x 3.0m) x 1.5KN/m²
= 13.5m² x 1.5KN/m²
= 20.25KN
Total Dead Load
Total Dead Load = Self Weight + Floor Finish Load
= 42.19KN + 20.25KN
= 62.44KN
2. Live Load Calculation
Formula:
Live Load = Area x Live Load per m²
= (Length x Width) x 4KN/m²
= (4.5m x 3.0m) x 4KN/m²
= 13.5m² x 4KN/m²
= 54KN
Total Load Over the Slab
Total Load = Dead Load + Live Load
= 62.44KN + 54KN
= 116.44KN
Total Load in Kilograms
Formula:
Total Load in kg = Total Load x 101.97
= 116.44KN x 101.97
= 11,873.39kg
Factored Load of RCC Slab
Factored Load, Wu = 1.5 x Total Load
= 1.5 x 116.44KN
= 174.66KN
Factored Load Per Unit Area
Formula:
W = Factored Load ÷ Area
= 174.66KN ÷ (4.5m x 3.0m)
= 174.66KN ÷ 13.5m²
= 12.94KN/m²
Conclusion
Calculating the total load and factored load over an RCC slab ensures the structure’s safety and durability. Following these steps helps engineers design slabs that withstand
Click Here To See RCC Slab Design: One-Way Slab vs. Two-Way Slab
