Dear Zul78289,
is there any best practice for reviewing the safest displacement distance for Dx,Dy,Dz,Rx,Ry,Rz so we can ensure that the value of displacement is safe?
It depends upon the project specs. Usually criteria is: sag (-DY) should be less than 12.5 mm, and Axial Displacement less...
Just double click "FORCES/MOMENTS" tab at the node, where you wish to apply force/moments, and enter the values with signs.
Moreover, you also need to edit load cases, by adding "F1".
For example:
L1 W+T1+P1 (OPE)
L2 W+P1 (SUS)
L3 W+T1+P1+F1 (OPE+FORCE)
L4 L3-L1 (PURE FORCE)...
Yes, it can be deactivated, in a similar fashion as it is activated. Just go to your desired node (from where, you don't need seismic affect),double click "Uniform loads" options, and replace g values with 0.