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Calculate The Uplift Resistance of a Square Footing: |
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Calculation: |
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Designer/Checker: |
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Input: |
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(Note: All input Metric units are converted to English units
for the equations below and then the output English units are converted back to
Metric) |
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Reference: Foundation Analysis and Design, 2nd
Edition, J. Bowles |
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Cohesion of the soil (c - psf or Pa)* |
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Height of the footing (H - ft or m) |
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Length of the footing (L - ft or m) |
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Width of the footing (B - ft or m) |
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Unit weight of the soil (dens - lb/cf or kg/m^3) |
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Total depth of the footing (D - ft or m) |
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Shape factor (Sf)* |
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Angle of internal friction of the soil (Ang - deg) |
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Weight of the footing (W - lb or kg) |
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*Cohesion, c = 0.0 for sandy, non-plastic, non-cohesive
soils, 100 psf for semi-cohesive soils, or 200 to 400 psf for cohesive clay
soils. |
*Shape factor, Sf use 1.00 for Ang = 15, 1.12 for Ang =
20, 1.6 for Ang = 30, 2.25 for Ang = 35, and 3.45 for Ang = 40.
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Output: |
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*Uplift resistance, Pv = |
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*It is recommended that a Safety Factor of 2 be used by either multiplying the
design uplift by 2 or by dividing the calculated uplift resistance by 2. |
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