Concrete Footing

Reference data and engineering information about concrete footing for building and construction applications.

concretefooting

Overview

Engineering reference data for Concrete Footing in building construction.

Key Formulas

U-value

$U = \frac{1}{R_{total}}$

Overall heat transfer coefficient.

Heat Loss

$Q = U A \Delta T$

Heat transfer through building envelope.

Variables

Symbol	Description	Unit
$U$	U-value	W/(m²·K)
$A$	Area	m²
$\Delta T$	Temperature difference	K

For quick volume estimation of concrete in continuous footings, you can use a simplified approach based on linear measurements. The total volume required is calculated by multiplying the footing's cross-sectional area by its total length.

Key Estimation Formula: $V = L \times W \times D$ Where:

$V$ = Total Volume of concrete (m³ or ft³)
$L$ = Total Length of the continuous footing (m or ft)
$W$ = Width of the footing (m or ft)
$D$ = Depth (or thickness) of the footing (m or ft)

Important Considerations:

Reinforcement: This volume calculation accounts for the gross space occupied by the footing. The actual concrete volume will be slightly less due to the space taken up by steel reinforcement bars (rebar).
Waste Factor: It is standard practice to order 5-10% more concrete than the calculated net volume to account for spillage, over-excavation, formwork variations, and consolidation.
Diagrams: The original reference mentions using diagrams for estimation. These typically show the relationship between footing dimensions, soil bearing capacity, and required concrete volume for common residential or light commercial loads.

References

Original Source

Source: engineeringtoolbox.com