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FRILO Isolated Foundation FD+

The FD+ program can be used to verify square and rectangular

The FD+ program can be used to verify square and rectangular foundations cast with or without sleeve or pocket. External loads can optionally apply centrically or with a uniaxial or biaxial eccentricity. The program calculates the soil pressure underneath the four corner points and the position of the neutral axis in combination with a gaping joint. The required flexural reinforcement is calculated for the foundation and the punching shear resistance is verified. The required reinforcement for the connection and the pocket is optionally determined. All required geotechnical verifications are optionally performed in the ultimate limit state and in the serviceability limit state.

Isolated Foundation


  • Reinforced concrete with selectable concrete qualities and steel grades
  • Different materials for the foundation and the column

Structural system

  • Square and rectangular foundations
  • Optionally with eccentric column
  • Optionally with interior and exterior base (pocket)
  • Smooth or toothed pocket surface (design in accordance with Leonhardt or Schlaich/Schäfer)


  • Any number of horizontal layers
  • Freely selectable soil parameters
  • Permissible base pressure resistance based on empirical values of DIN 1054

Ground surface:

  • Horizontal or continuously ascending
  • Any number of polygonal ground-surface sections


  • Stagnant groundwater can optionally be taken into account at any height level


  • Any column loads for biaxial loading, if applicable:
    • Vertical concentrated load V
    • Horizontal concentrated load in the x- or y-direction (optionally applying to the top edge of the pocket or the foundation)
  • Concentrated moments about the x-axis and the y-axis
  • Any additional loads applying to the foundation as concentrated loads, line loads or area loads.
  • Free assignment of loads to types of actions according to EC 0 as well as to concurrency and alternative groups.
  • General separation of the definition of design loads and of characteristic loads with automatic load case combination.

Reinforced concrete design (internal stability)

  • Punching shear analysis with/without punching shear reinforcement
  • Bending design
  • Shear force design
  • Pocket design with strut-and-tie models
  • Durability verification via exposure classes
  • Consideration of different minimum reinforcement quantities
  • Any kind of reinforcement and any arrangement definable in the reinforcement dialog

Geotechnical verifications (external stability)

  • Simplified verification with base pressure resistances (either user-defined or based on tables of DIN 1054)
  • Optional verifications using the accurate calculation method:
  • Overturning
  • Sliding
  • Ground failure
  • Optional settlement verification
  • Serviceability via the verification of the gaping joint and torsion

Document file formats

  • PDF
  • Word
  • Printer


  • Various output profiles available for selection (brief, detailed, user-defined)
  • Selectable graphic scales and font sizes
  • Detailed output of individual load cases
  • Overview of the decisive load case combinations and their assignment to the design situation (persistent, transient, accidental and earthquake)
  • Reinforcement sections can optionally be output in the form of a reinforcement plan

Reinforced concrete design

  • Decisive base pressure distribution for the individual design calculations
  • Bending design in the x- and y-direction at the top and bottom of the foundation with detailed graphical and tabular output
  • Graphical representation of the reinforcement distribution and, if applicable, staggered reinforcement quantities
  • Detailed graphical and tabular representation of the punching shear design
  • Detailed output of the pocket design, if applicable
  • Details on calculated lapping and anchorage lengths

Geotechnical verifications

  • Tabular and graphical output of the selected decisive actions and base pressures for each selected geotechnical verification
  • Verifications in the ULS (simplified with base pressure, overturning, sliding, ground failure)
  • Verifications in the SLS (first and second core range, settlements, and torsion)


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