The Lean concrete/Block foundation tab allows you to define the dimensions of a lean concrete/ block foundation.
(Lean Concrete), click Apply button. The Lean concrete / Block foundation option is only available for the French geotechnical codes: DTU 13.12 and Fascicule No 62 - Titre V. Access
Select RC Design 
Provided reinforcement layout, and then create a new RC element, or open an existing one.
- Click RC Element Dimensions.
- Click
(Dimension Definition).
Dialog elements
- Lean concrete / Block foundation
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There are three choices for Lean concrete / Block foundation.
Lean concrete with no offsets (dimensions identical as in the case of the foundation) - Defines only the thickness (height) of lean concrete / block foundation
Lean concrete with equal offsets -Defines the offset dimension and the thickness (height) of lean concrete / lock foundation
Lean concrete with arbitrary offsets - Defines the offset dimensions in each direction and the thickness (height) of lean concrete / block foundation.
Note: During calculations of a spread footing on lean concrete / block foundation the following conditions are checked:- Spread footing. Capacity and stability for overturning.
- Contact between the spread footing / lean concrete/block foundation: Uplift (contact surface).
- Lean concrete/block foundation: Capacity for the directions X/Y, lateral capacity for the directions X/Y.
If dowel bars are generated between the spread footing and lean concrete / block foundation, the sliding condition is not checked.
- Block foundation
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If the Block foundation option is selected, the dialog displays the following additional parameters:
- Kh - horizontal soil compressibility.
- K v - vertical soil compressibility.
- H0 - height of the soil measured from the top of the block foundation for which stress will not be calculated (it is not taken into account in calculations).
- Optimization step
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Determines the optimization parameters when the adopted block foundation parameters do not meet the requirements (in particular, the height H is a dimension that is optimized for the block foundation). An optimization method should be chosen.
- Specified length (m).
- Percent value of the dimension used so far (%).
Note: Calculations for the block foundation are performed independently for the direction X and for the direction Y.Stress in the soil for the block foundation can be evaluated using the stress pressiometric method: allowable, SLS and ULS.