Analysis of Walls (Support Structures)
Designing a structure according to EN 1997-1 essentially follows the analysis of limit states.
Load reduction (DA1, DA2, DA3):
All design approaches consider partial factors reducing load. These are used to multiply all forces entering the analysis. For actual verification of individual modes of failure the program determines, whether the force or pressure acts favorably or unfavorably. Depending on that these actions are then multiplied by the corresponding partial factor. Information regarding the applied partial factors is stored in the analysis protocol.
The frame analysis allows to define "Secondary variable actions" - corresponding partial factors are then multiplied by the combination coefficients of load.
When analyzing supporting structures, the water actions and so the determination of the corresponding partial factor for water become very important.
Reduction of material (DA1, DA3):
Soil parameters are automatically reduced by corresponding partial factors.
Reduction of resistance (DA2):
Corresponding magnitudes of resistant forces, moments and bearing capacities are reduced.
When performing analysis according to the Design approach 1, all verifications are carried out twice for both combinations of load. For a given limit state the highest stressed design is displayed on the desktop.