Design of Continuous R.C.C. Retaining walls (Bins with Three Sides Enclosed) Using STAAD PRO V8i

We require to design a series of R.C.C Bins in continuity having three sides enclosed with Triangular loading on each side as shown in the Staad Model Snap Shot below.

I can provide Staad file for reference. It would be great if someone can explain whether this is a correct approach to design the structural system.