modeling of a spring and a damper in parllel

[aaataha]

Hi,

I am trying to model a spring-damper system in which the spring and the damper are placed in parallel. I couldn't find any material or element that would simulate that behavior. The available ViscousDamper material simulates a spring and a damper put in series, and the Viscous material isn't allowed be modeled in parallel with a spring.

Any help would be appreciated.

Thanks

[selimgunay]

I am not sure if this will work, but you can try two zerolength elements between the same two nodes, one zerolength element for the spring and the other with the Viscous material.

[Rawneix]

Nice information

https://sundarmarathistatus.blogspot.com/

[Danielaait]

Dears,

I am also facing the same problem.
Is there an effective way to model parallel spring and dashpot model in OpenSees?

Assigning two ZeroLength elements is not working.

[selimgunay]

You can activate Rayleigh damping in the zerolength element with the doRayleigh option and use the region command to assign the dashpot constant.

https://opensees.berkeley.edu/wiki/inde ... th_Element
https://opensees.berkeley.edu/wiki/inde ... on_Command

[Danielaait]

Dear selimgunay,

Thank you very much for your reply.
Ok, I will try using your recommendation.