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Isolated footing soil pressure

Elastic bearing pressure under axial load and moments, with the kern (no-uplift) check and the allowable-pressure comparison.

Inputs

Axial load NkN

Moment M_LkN·m

Moment M_BkN·m

Length Lm

Width Bm

Allowable pressurekPa

Results

Eccentricity e_L / e_B [m]—

σ_min [kPa]—

σ_max [kPa]—

Citations

σσ = N/A ± M_L/W_L ± M_B/W_B; W_L = B·L²/6, W_B = L·B²/6.

KERNNo uplift needs e ≤ L/6 (and B/6). Beyond the kern, partial-contact analysis is required.

VERIFYHand-verified: N=1000, M=100, 2×2.5 m → σmax=248, σmin=152 kPa.

Engine: rc-tr.js v0.1.0 · Method: elastic bearing · Date:

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Preliminary calculation tool. Results are for preliminary sizing and cross-check only. Final design, sealed responsibility, and permit submissions require the full official text of the referenced regulations and the review of a licensed engineer.