flat slider bearing-mode shape

[engnomran]

Hello every body
I have problem for display mode shape.
I model bridge with "Flat slider" in opensees.
I want to see mode shape.
1-I can not see mode shape in "OSP"(maybe cause to "Flat slider" command).why?
2-I use recorder node for save shape mode but I change initial stiffness(Kinit) in "flat slider" command ,mode shapes not change?why?
3-what is nodeRange in "recorder Node" command?
%%recorder Node -file [format "modes/mode%i.out" $k] -nodeRange 1 6 -dof 1 2 3 "eigen $k"%%

4-Are mode shapes true when I use of Flat slider command(or I can not see correct mode shapes when use of command Flat slider command )?
Please help me, I want to use correct mode shapes in research.
thank you

[nhytb]

hi. mail me your model
en.n.hytb@gmail.com