modeling of a spring and a damper in parllel

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aaataha
Posts: 15
Joined: Sun Oct 13, 2019 1:44 pm

modeling of a spring and a damper in parllel

Post by aaataha » Sat Oct 24, 2020 4:59 am

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
Posts: 913
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: modeling of a spring and a damper in parllel

Post by selimgunay » Mon Oct 26, 2020 10:40 am

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
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Location: India
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Re: modeling of a spring and a damper in parllel

Post by Rawneix » Tue Nov 10, 2020 3:52 am


Danielaait
Posts: 8
Joined: Fri Apr 09, 2021 6:11 am

Re: modeling of a spring and a damper in parllel

Post by Danielaait » Thu Sep 16, 2021 9:07 am

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
Posts: 913
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: modeling of a spring and a damper in parllel

Post by selimgunay » Fri Sep 24, 2021 9:33 am

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
Posts: 8
Joined: Fri Apr 09, 2021 6:11 am

Re: modeling of a spring and a damper in parllel

Post by Danielaait » Fri Sep 24, 2021 1:23 pm

Dear selimgunay,

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

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