I use STEEL TAKE OFF or CONCRETE TAKE OFF for finding out the total weight of members. However how can I find out the total weight of just the plates ?
The easiest way would be to create a load case and have the selfweight load assigned to just the plates within that load case. For example, if your plates are numbered 100 TO 200, you may specify a load case as shown next
LOAD 100 : Selfweight Load for Plates
SELFWEIGHT Y -1 LIST 100 TO 200
Alternately one can assign the plates to a plate group ( let’s say the group name is _FL ) and subsequently specify the command as
SELFWEIGHT Y -1 LIST _FL
Subsequently you can look at the static check results for load case 100 which will give you the total weight of the plates.