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Dear STKO team,
I am modelling composite shear (Trapezoidal Corrugated steel sheet with infilled reinforced concrete) wall as layered shell and boundary element as fibre section.
1. How to consider trapezoidal section to have equivalent thickness in layered shell.
2. Steel sheet is of 0.8 mm thickness. how to consider that in modelling?

You can follow our webinar where we talked about modeling RC shear walls with shells.
Following the same approach, you can add 2 extra layers to the LayeredShellSection (bottom and top).
Each layer will have a 0.8 mm thickness (like your steel plate) and a J2Plasticity (Von Mises metal plasticity in 3D).

For the corrugated shape, you can compute an equivalent thickness, like eq_thickness = real_area / width.