Interaction curves, diagrams and stability graphics

Display detailed graphical results for performed checks

 

The Reinforced Concrete BIM Designers provide graphical results for the performed verifications giving a better overview of the status of the designed element. The Stability section of the Reinforced Concrete BIM Designers for footings is divided into four sections or viewports, which display the results for a certain verification: compressed surface verification, sliding, overturning and eccentricity check.

 

The user can instantly distinguish the main results and is able to choose both the soil condition (drained or undrained), and the combination to be analyzed.

 

 

Compressed surface verification

This verification is related to the Eccentric load effects section in the Design Assumptions dialog.

The ability of a spread foundation to carry forces is significantly reduced when they are applied eccentrically to the foundation. To avoid the footing's edges losing contact to the ground, the value of the compressed footing area (effective area) should be set over a minimum percentage.

In this section, user can define the percentage value to be considered for the minimum footing area in compression:

  • Verify: check this option to verify the percentage of compressed footing area at the Serviceability and Ultimate Limit States
  • ULS (FUN/ACC/SEI): enter a percentage for the footing area in compression for the ultimate limit states (fundamental, accidental, seismic)
  • SLS (QPR/FRQ): enter a percentage for the footing area in compression for the serviceability limit states (quasi-permanent, frequent)
  • SLS (CHR): enter a percentage for the footing area in compression for serviceability limit state (characteristic)

 

 

Sliding verification

The assumptions for this verification are defined in the section 'Sliding' from the Design Assumptions dialog.

 

Note: Where the loading is not normal to the foundation base, foundations shall be checked against failure by sliding on the base. [EN 1997-1 §6.5.3(1)]

  • Cast-in-situ concrete: if this option is checked, the friction angle d is assumed to be equal to the design critical state angle of shearing resistance f 'crit. According to EN 1997-1 §6.5.3(10), "The design friction angle dd may be assumed equal to the design value of the effective critical state angle of shearing resistance f'cv;d, for cast-in-situ concrete foundations [...]."
  • Imposed value: if this option is checked, a value can be entered for the friction angle between the footing and the foundation soil.

 

 

Overturning verification

This verification is related to the Overturning EQU section from the Design Assumptions dialog.

 

  • Verify: check this option to verify the footing's stability for overturning
  • Safety factor: enter the value of the factor of safety against overturning

 

 

Eccentricity check

The eccentricity verification is performed according to the article §6.5.4 from EN 1997-1: "Special precautions shall be taken where the eccentricity of loading exceeds 1/3 of the width of a rectangular footing [...]."

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