Since you would like to get the moments from the analysis and would like to design reinforcements, modeling with plate elements would be the way to go. The modeling for the wall can be simplified if you use an average uniform thickness rather than a varying thickness to simulate the trapezoidal cross section. You can specify plates of varying thickness too but only the modeling would be more involved as at every increment along the height of the wall, you would need to specify the thickness. The toe, heel and counterforts could be modeled with plate elements as well. Loads can be applied using the hydrostatic option or the pressure load on full plates option available within Plate Loads. Although STAAD.Pro does not have a specific design for retaining walls but based on the moments calculated from the FE Analysis, it can calculate reinforcement requirement as per various concrete design codes like the ACI 318, IS 456, CAN/CSA A23.3 etc.
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