Dimensions Definition - Lean concrete/Block foundation tab (RC foundation)

The Lean concrete/Block foundation tab allows you to define the dimensions of a lean concrete/ block foundation.

Note: The Lean concrete/Block foundation tab is only available once the foundation supported on lean concrete is selected in the General tab. After clicking (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.

By default this dialog is available at the bottom of the Foundation - View tab in the Provided reinforcement layout. Alternatively, you can access this dialog as follows:

• Click RC Element Dimensions.
• Click (Dimension Definition).

Dialog elements

Lean concrete / Block foundation

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

If the Block foundation option is selected, the dialog displays the following additional parameters:

• K_h - 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

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.