i want to study the strength of steel grate

[ah1702475]

Good day,

I need to study the strength of a grate and deflection, i have a reference report but i could not understand how did he imported the geometry from a cad drawing to the software, did he assign it as a panel or a steel section? 

figure is below:

 

 

[Stephane.kapetanovic]

This appears to correspond to a panel with openings.