How to model spring or damper in OpenSees

[fmk]

it means what it says .. the program has deermined your zero length element does not have zero length .. it is only a warning, but it is issued in case you have messed up in the script as most people have zero length between the 2 nodes ..

[egeria]

so what is the solution ? how we can model the viscous Damper ?

[fmk]

did you read my post, you ignore the warning message! .. there are other material options, e.g. Maxwell provide for viscous damping as well.

[susan]

Dear vesna,

You proposed the truss element for modeling a damper.
how can i model the dampers at the ends of a horizontal beam? have truss elements zero length?

tnx.