Starting with the 2020 version of Advance Design, the walls are characterised by a supplementary set of conventional local axes (similar to an equivalent column) used internally exclusively for resultant forces computation. The system is correlated to the initial local axes and it is oriented as follows:

-  "Xeq" always on vertical direction, in most cases is Global Z up;

- "Zeq" is perpendicular to the wall, the same orientation as the planar element's local "z"; this is to preserve the orientation of the wall;

- "Yeq" is the cross product "Zeq" x "Xeq".  

The use of this internal local axes convention reduces the 8 different local axes orientations to 2 cases. The local axes are still represented with a thick line and the conventional axes are represented with thin line, as shown below.

Resultant forces axes case 1

Resultant forces axes case 2

The internal shell efforts will be transformed to this equivalent frame. 
The numerical integration of shell efforts (transformed in Equivalent frame) generates the following resultant forces:
In plane components N, Txy, Mz:
- N = the integration of Fxx shell efforts;

Resultant force N

- Txy = the integration of Fxy shell efforts;

Resultant force Txy

- Mz = moment of the diagram Fxx resultant, calculated from the middle of the Section cut;

Resultant force Mz

Out of plane Tyz, Mf:

- Tyz = integration of Fxz shell efforts;

Resultant force Tyz

- Mf = integration of Myy shell efforts.

Resultant force Mf

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