AustraliaAS 3600:2018 (Amdt 2)
Wall loads link from above so changes propagate down automatically. Design and check concrete wall footings to AS 3600:2018 (Amdt 2) with instant moment, shear, stability, and bearing stress results. Handles wall placement at center or edge of footing with uniform vertical loads or uniaxial bending moments.
Easily design and analyze a concrete wall footing using the Calcs.com Concrete Wall Footing Analysis and Design to AS3600:2018 (Amdt 2) calculator. The calculator provides instant results for moment, and shear, as well as stability checks and compressive stress. It assumes the wall is placed either at the center of the footing or along the edge, and the only loads are vertical uniform loads along the length of the wall or uniaxial bending moments about an axis parallel to the wall. Detailed considerations and deflections are checked separately.
Method & scope
Calculation method
The Concrete Wall Footing calculator designs continuous strip footings supporting a concrete or masonry wall to AS 3600:2018 (Amdt 2). The footing is modeled as a unit-length strip (1 m) with the wall positioned either at the center or along one edge, subjected to vertical load and a uniaxial bending moment parallel to the wall.Applied loads and load cases
Loads are entered as axial force per unit length (G and Q) and bending moment per unit length about the axis parallel to the wall. The calculator generates strength load cases per AS/NZS 1170.0 (1.35G; 1.2G + 1.5Q; and combinations with wind where entered) and working load cases for the bearing check. Self-weight of the footing concrete is computed automatically from the footing geometry.Bearing stress check (working loads)
Under the governing working load case, the net eccentricity of the resultant vertical force is determined. The bearing stress distribution (trapezoidal or triangular, depending on whether the resultant falls inside or outside the kern) is compared to the allowable bearing capacity q_a entered by the engineer: q_max ≤ q_a A warning is flagged if the resultant falls outside the footing, indicating the footing would partially lift and the bearing stress would exceed the uniform assumption.Moment demand and capacity (AS 3600:2018, Cl. 8.1)
The critical section for bending is at the face of the wall. The cantilever moment demand M_u at the critical section is calculated from the net upward soil pressure on the toe side under the governing strength load case: utilization = M_u / (phi × M_n) ≤ 1.0 where phi = 0.85 for bending and M_n is calculated from the reinforcement area, bar depth, and concrete compressive strength. Minimum reinforcement per AS 3600:2018 Cl. 8.1.6 is also verified.Shear demand and capacity (AS 3600:2018, Cl. 8.2)
One-way shear is checked at a distance d_v from the face of the wall. Shear capacity is calculated using the simplified method per AS 3600:2018 Cl. 8.2.4 without shear reinforcement (Asv = 0): utilization = V_u / (phi × V_n) ≤ 1.0 where phi = 0.75 for shear.Assumptions and scope
The footing is a continuous strip with unit breadth (1 m). Only vertical loads and uniaxial moments parallel to the wall are considered. Lateral loads on the footing, bi-directional eccentricity, and detailed deflection checks are outside the scope of this calculator. The footing is assumed to be in contact with the soil over its full base length (no uplift beyond the kern check).How to use it
1
Open the calculator
Open it from Run calc in the About this calculator panel above.
2
Enter your inputs
Work through the input sections from top to bottom. Click any input label to see its reference explanation, clause, conditions and assumptions. See Checks, References, Conditions and Assumptions.
3
Review the results and export
Check the utilization of each governing check in the summary, then export a PDF report. See Views and Export.
Common questions
What design standard does this calculator use?
What design standard does this calculator use?
The calculator designs concrete wall footings to AS 3600:2018 (Amdt 2), including strength load combinations per AS/NZS 1170.0 and material requirements for normal-class concrete. Bearing capacity is entered by the engineer and checked against the allowable limit under working loads.
What are the key inputs?
What are the key inputs?
Key inputs are footing breadth and thickness, wall thickness, wall position on the footing (center or edge), concrete strength, reinforcement bar size and spacing, concrete cover, axial load per unit length along the wall, and applied bending moment about the axis parallel to the wall. Allowable bearing capacity is also entered for the bearing check.
What does the calculator check and output?
What does the calculator check and output?
The calculator outputs moment demand and capacity of the footing, shear demand and capacity, bearing stress under working loads versus allowable bearing capacity, and a limited stability check. Results include utilization ratios for each limit state and a volume of concrete estimate.
Can this calculator handle off-center wall placement?
Can this calculator handle off-center wall placement?
Yes. The wall can be positioned at the center of the footing or along one edge. The footing cantilever length and critical section positions are adjusted accordingly, and the eccentricity is accounted for in the bearing stress and stability checks.
What loads are supported?
What loads are supported?
The calculator handles vertical uniform loads (kN/m) along the wall length and uniaxial bending moments about an axis parallel to the wall. Out-of-plane horizontal loads, bi-directional bending, and uplift are not included. Detailed deflection checks must be performed separately.
Does this calculator support load linking with the wall calculation above?
Does this calculator support load linking with the wall calculation above?
Yes. The wall footing can receive its vertical load reaction directly from the wall or beam calculation above in the same project. When loads change in the upstream calculation, the footing inputs update automatically so you don’t need to re-enter loads manually.
Next steps
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