element forces and stresses during a time-domain

Hello,

I'm performing a time-domain simulation of a moored barge with an item (structural) onboard.

I performed a time-domain calculation (TDOM), from which I get motions and mooring forces (via PRCPOST).

I would like to obtain "INTERNAL" element forces (axial & shear forces and moments, and stresses in the time-domain) for the structural elements I defined, during the time-domain simulation: is this data yet available just after TDOM in PRCPOST, or should I perform some other "STRUCTURAL" calculation steps?

Could someone point me to an example (in the moses sample library) in which a time-domain structural stress analysis was performed?

At the moment I tried to get element forces via the following command just after TDOM, but I get zero values (I suspect the results are the EXTERNAL applied forces and not the "INTERNAL" element forces)

PRCPOST
  ELMFORCE C2S1
    plot 1 2 3 4 -rax 5 6 7 -no
  end
end

Thanks in advance

Doug