It’s easy to apply tapered surface loads to plates in RISA-3D by stepping up the loads from one level to the next.
Clicking and dragging over plates allows you to apply the surface loads to a group of plates at the same time.
Apply the first magnitude of Surface loads to the selected plates, making sure to select Apply to Selected.
Click and drag to select the next row of plates, and apply the next magnitude of loads to this level. You can continue this method all the way up the model.