Analysis of sheeting structures

Load reduction (DA1, DA2, DA3):

In programs that consider the overall earth pressure in the analysis (Earth pressure, Sheeting design, Sheeting check) the partial factors are used to multiply individual components of pressure acting on a structure.

The basic assumption of the analysis is that active earth pressure acts unfavorably whereas passive earth pressure is considered as favorable. Individual pressure diagrams are therefore multiplied by the corresponding partial factor.

Reduction of material (DA1, DA3):

Parameters of soils are automatically reduced by corresponding partial factors.

Reduction of resistance (DA2): not considered.

In simple words, DA1 – Combination 2 and DA3 increase the magnitude of active pressure and reduce the magnitude of passive pressure, while DA1 – combination 1 and DA2 only increase the magnitude of active pressure.

This approach may therefore change in some cases the structure behavior and deliver misleading results. Caution must therefore be exercised when reducing input parameters.

Response of sheeting structure upon unloading