Tangent stiffness proportional damping

Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe

Moderators: silvia, selimgunay, Moderators

Post Reply
giovannimilan
Posts: 71
Joined: Wed Apr 05, 2017 12:49 am
Location: ARUP, amsterdam

Tangent stiffness proportional damping

Post by giovannimilan » Tue Aug 29, 2017 6:34 am

Hi all,

I ve noticed in a couple of reference examples, there is the tendency to avoid using tangent stiffness proportional damping in zero length elements with non-linear hysteretic behavior, and apply the stiffness proportional at elastic members only.

Why is that the case?

I would say using the initial stiffness damping is un-conservative, cos the inertia forces arising in the non linear regime are too-high (cos based on the initial stiffness value) and hence for instance the peak displacement would be quite low.

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

Re: Tangent stiffness proportional damping

Post by selimgunay » Thu Aug 31, 2017 11:08 pm

Please see the below paper:

Chopra, A. K., & McKenna, F. (2016). Modeling viscous damping in nonlinear response history analysis of buildings for earthquake excitation. Earthquake Engineering & Structural Dynamics, 45(2), 193-211

giovannimilan
Posts: 71
Joined: Wed Apr 05, 2017 12:49 am
Location: ARUP, amsterdam

Re: Tangent stiffness proportional damping

Post by giovannimilan » Mon Sep 04, 2017 9:46 am

Thanks for the reply. I cant find a student free download. Is there someone who'd like to share it?

selimgunay wrote:
> Please see the below paper:
>
> Chopra, A. K., & McKenna, F. (2016). Modeling viscous damping in
> nonlinear response history analysis of buildings for earthquake excitation.
> Earthquake Engineering & Structural Dynamics, 45(2), 193-211

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

Re: Tangent stiffness proportional damping

Post by selimgunay » Thu Sep 07, 2017 3:24 pm

I will email it to you

giovannimilan
Posts: 71
Joined: Wed Apr 05, 2017 12:49 am
Location: ARUP, amsterdam

Re: Tangent stiffness proportional damping

Post by giovannimilan » Fri Sep 08, 2017 2:19 am

selimgunay wrote:
> I will email it to you

Great. Thanks.

giovanni1.milan@gmail.com

giovannimilan
Posts: 71
Joined: Wed Apr 05, 2017 12:49 am
Location: ARUP, amsterdam

Re: Tangent stiffness proportional damping

Post by giovannimilan » Mon Sep 18, 2017 2:42 am

selimgunay wrote:
> I will email it to you

Dear Selim,

could you please share the document?

Thank you in advance for your help.

Regards,

Giovanni

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

Re: Tangent stiffness proportional damping

Post by selimgunay » Wed Sep 20, 2017 12:42 am

I have emailed it to you. Please let me know if you cannot access it for some reason.

Post Reply