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Strength of Concrete
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Specify the ultimate strength of the concrete (f'c), in the selected units. |
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Yield Strength of Steel
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Specify the yield strength of steel reinforcing bars (fy), in the selected units. |
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Footing Clear Cover
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Value of clear cover, in the selected units. |
| Minimum / Maximum Bar Spacing |
Specify the minimum and maximum distances to be allowed between reinforcing bars, in the selected units. |
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Unit Weight of Concrete
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Specify a density to be used for concrete (wC), in the selected units. |
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Unit Weight of Soil
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Type a density to be used for the soil, in the
selected units.
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Depth of Soil
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Specify the depth from soil surface to the top of footing, in the selected units. |
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Soil Bearing Capacity
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Value of allowable bearing pressure used for design, in the selected units. |
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Depth of Water Table
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Type the depth from soil surface to the water table,
in the selected units.
If water table is not to be considered for this
footing, leave this value blank.
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Stability Ratio (Overturning)
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Type a minimum factor of safety against overturning used for design. |
| Stability Ratio (Sliding) |
Type a minimum factor of safety against sliding used for design. |
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Coefficient of Friction
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Specify a coefficient value of friction between the soil and concrete.
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Surcharge for Loading
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Type a surcharge loading above the footing, in the
selected units.
For the stability check for calculating the factor of safety in sliding, surcharge is treated as a temporary load, meaning, it is treated as though there may be times when it is not present. Thus, its contribution to sliding resistance is not considered. That will reduce the total sliding resistance which will produce a more conservative result.
However, surcharge is considered when determining the soil bearing pressures under service loads since it leads to an increase in soil pressure.
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Set as Default
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Select Yes to have the current parameter values set as the defaults for new Octagonal Footing: Concrete and Rebar parameters.
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