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Foundation Engineering · Axiom Platform

Shallow Foundation

EC7 pad foundation design in one step. Enter your characteristic loads, soil properties, and pad dimensions; get fully-factored bearing capacity, sliding resistance, eccentricity, and uplift checks for both Design Approach 1 Combinations — with utilisation factors and governing combination highlighted.

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Loads & Geometry → Soil Properties → EC7 Partial Factors → DA1C1 & DA1C2 → Bearing / Sliding / Eccentricity / Uplift → Utilisation Factors

Eurocode 7 Design Approach 1

Both combinations are evaluated simultaneously from the same set of characteristic inputs. The governing combination — the one with the highest utilisation — is identified automatically for each check.

  • DA1C1 — actions factored (A1: γG,unfav = 1.35, γQ,unfav = 1.5); material properties at characteristic values (M1).
  • DA1C2 — actions lightly factored (A2: γG,unfav = 1.0, γQ,unfav = 1.3); material properties factored (M2: γφ' = 1.25, γc' = 1.25, γcu = 1.4).
  • National Annex partial factors are user-configurable — all EC7 defaults can be overridden via the API.
Characteristic Inputs
DA1C1 (A1+M1) DA1C2 (A2+M2)
Bearing Sliding Eccentricity Uplift

Inputs

All inputs are characteristic values — the app applies EC7 partial factors internally for each combination. No manual load factoring required.

  • Foundation geometry

    Pad plan dimensions Lx and Ly (m), depth h (m), finished floor level (FFL), top-of-foundation level (TOF), and groundwater level (GWL).

  • Vertical & horizontal loads

    Characteristic permanent (G) and imposed (Q) vertical loads, uplift, horizontal loads in X and Y, and moments Mx and My — all in kN or kNm.

  • Soil properties

    Effective friction angle φ'k, residual friction angle, effective cohesion c'k, undrained shear strength cu,k, interface friction angle δk, unit weight γ, and cast condition (cast-in-situ or pre-cast).

  • EC7 partial factors

    Default values per EC7 Table A.3–A.5 are pre-populated. All action, material, and resistance factors are individually overridable for National Annex compliance.

Design checks

Four limit state checks are run for both DA1C1 and DA1C2. Each returns design resistance, design action, and a utilisation factor — the governing combination is flagged.

  • Bearing capacity

    Net ultimate bearing capacity Rd from Brinch Hansen formulation with shape, depth, and inclination factors. Checked against design vertical action Vd. Drained and undrained soil conditions supported.

  • Sliding resistance

    Horizontal resistance from base friction and passive soil resistance at foundation edge. Checked against combined resultant horizontal design action. Passive resistance can be suppressed where excavation reaches the pad edge.

  • Eccentricity

    Load eccentricity ex and ey derived from net moment and vertical load. EC7 §6.5.4 limit of L/3 in each direction checked for both combinations — effective foundation area reduced accordingly in bearing capacity.

  • Uplift (EQU)

    Stabilising permanent vertical action versus destabilising uplift load per EC7 §2.4.7.4 EQU set. The stabilising load can be set independently of the bearing-capacity vertical action to account for always-present gravity.

Outputs

Results are returned for both combinations in a single response. Utilisation factors are colour-coded in the UI — green (< 0.75), amber (0.75–1.0), and red (> 1.0).

  • Utilisation factors (UF)

    UF = design action / design resistance for each check. Governing combination (DA1C1 or DA1C2) is the higher UF; values above 1.0 indicate a failed check.

  • Effective foundation area

    Reduced plan dimensions B' and L' after applying eccentricity in both axes — used in the bearing capacity calculation for each combination.

  • Factored loads

    Design-level vertical, horizontal, and moment actions for both DA1C1 and DA1C2 — confirming the factoring applied before the resistance check.

  • Reinforcement schedule

    Bar spacing (mm c/c) derived from provided As (mm²/m) and bar diameter for both X and Y directions, with effective depth and bar centre cover.

REST API

Submit characteristic loads and soil properties as JSON; receive full EC7 design results for both DA1C1 and DA1C2 in a single response. Integrate with spreadsheets, scripts, or automated report pipelines.

  • POST /shallow_foundation/api/design/ JSON body: geometry (lx, ly, h, ffl, tof, gwl), characteristic loads (v_perm_g, v_imp_q, uplift, hx_*, hy_*, mx_*, my_*), soil properties (φ'k, c'k, cu,k, δk, γ), and optional EC7 partial factor overrides. Returns UF, resistances, effective area, and factored actions for both combinations.

Part of the AxiomBaseLogic platform

Shallow Foundation ships alongside Liquefaction Analysis, Borehole EDA, CPT Processor, Plotter, AGS Parser, and Data Mapper — on a single platform with shared auth, shared data, and REST APIs. Subscribe once, access all apps.

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