Design of Steel Wall form Panels / Plates

Hello everyone'

Guys I Have a problem, I need ur help very urgently, SEE THE ATTACHED image, and other DETAILS AS MENTIONED BELOW, or u can find the image from google (in google image option just type wall form panel and first image will show u the panel)

my question is that how can i check (i.e. in staad.pro with check code option, whether it is going to pass or fail) a panel (i.e. wall form panel made out with 3mm thk. steel sheet , angle 45 x 45 x 5)  loaded with hydrostatic pressure / conc. pressure. pls find the details below:

Panel size = 500mm x 1250 mm (height)

Angle = 45 x 45 x 5 mm (along 500 mm 2 nos. only at edges; along 1250mm 2 Nos only at edges & 1 Nos along 1250mm as a central stiffner) (all angles should be weld90degree with plate

Steel Sheet thk. = 3mm

Conc . Pressure / Hydrostatic pressure = 25kn/m^2 per meter of height (therefore load will act as a  trapizoidal load, so that at bottom of panel it will be 31.25kn/m^2 [i.e. 25kn/m^2 x 1.25m (height) = 31.25kn/m^2] AND at Top of panel it will be 25kn/m^2

Pls consider 500mm x 1250mm face area for loading 

 Note : Suppose it is a Retaining Wall Formwork, therefore the arrangement will be like 2 Panel connected by nut and bolt then we are using one heavy duty soldier connected with panel by nut & bolt after soldier 2 panel again & repetition;  support of props Waler will be provided from back sides

 But I want to check a single panel or 2 panel coneected by nut & bolt; and pls note that practically it is passed, I mn the above  panel can take the pressure of conc. AND STILL WE ARE USING THOSE PANELS BUT I WANT TO CREATE THE MODEL IN STAAD.PRO AND CHECK AS PER CODE OR ANY OTHER OPTIONS FROM WHICH I CAN UNDERSTOOD THAT WHETHER THE PANEL WILL PASS OR FAIL

pls feel free to contact me any time....

Thanks to everyone