Possible foundation limit states are used in the geotechnical calculations of foundations. These include load capacity of the soil, sliding, rotation (local stability), position of a force resultant (uplift, contact area), lifting, average settlement, and settlement difference.
These can be assigned to the Limit State groups of Ultimate, Serviceability, Accidental or Seismic. Regional requirements determine whether a limit state is ascribed to a given group of limit states.
Limit States belonging to several groups or special combination types are distinguished (such as long and short-term combinations, wind, snow or seismic combinations), it is possible to impose a separate limit for each combination type and each Limit State.
| Code | Combination for Limit States | |||
| Ultimate | Serviceability | Accidental | Seismic | |
|
ACI |
- |
capacity of the soil rotation average settlement settlement difference |
- |
capacity of the soil |
|
BS 8004:1986 |
- |
capacity of the soil sliding rotation average settlement settlement difference |
- | - |
|
CSA |
- |
capacity of the soil rotation average settlement settlement difference |
- |
capacity of the soil |
|
DTU 13.12Fascicule 62 Titre V |
capacity of the soil position of a force resultant sliding rotation |
position of the force resultant |
- |
lifting sliding rotation |
|
ENV 1997-1:1994 (EC 7) |
capacity of the soil (combinations A, B and C) position of a force resultant (combinations A, B and C) |
average settlement |
capacity of the soil |
- |
|
EN 1997-1:2004 (Eurocode 7) |
capacity of the soil (for combinations of A 1, A2 type, depending on the design approach) position of a force resultant (for combinations of A 1, A2 type depending on the design approach) |
average settlement |
capacity of the soil |
- |
|
PN-81/B-03020 |
capacity of the soil position of a force resultant sliding rotation |
average settlement |
- | - |
|
SNiP 2.02.01-83 |
capacity of the soil |
sliding rotation average settlement |
capacity of the soil |
- |
Design approach for EN 1997-1:2004 (EC 7)
In accordance with point 2.4.7.3.4, Robot allows to choose one of three design approaches. The design approach selection is available in the Geotechnical options / Design approach tab. Additional information about the design approaches can be found in the Appendix B.