topic Re: Rayleight Damping value for newmark method in Robot Structural Analysis Forum

Rayleight Damping value for newmark method

Anonymous — Fri, 10 Jul 2020 22:08:48 GMT

Hi everyone;

I used time history for the nonlinear analysis, I chose newmark method but I did not know how to add the parameters of Rayleigh Damping and from where I can got them , could you please help me to fix it?

Re: Rayleight Damping value for newmark method

Krzysztof_Wasik — Sat, 11 Jul 2020 17:04:53 GMT

Hi @Anonymous

Rayleigh damping is based on two factors Alpha and Beta, which can be calculated using Rayleigh damping calculation tool in Robot.

Pulsations w1 and w2 can be obtained from modal analysis in Robot.

Part of critical damping ksi 1 and ksi 2 for, regarded pulsations (w1 and w2) are related to structure type, and cannot be calculated in Robot.

If you do not know what value should be defined as ksi ratio, you can refer to the following discussion.

Damping factors

Damping in buildings

see also Robot help topic Rayleigh damping

More information you can find (for instance ) in the following tutorial

Re: Rayleight Damping value for newmark method

Anonymous — Sun, 12 Jul 2020 11:43:52 GMT

Thanks a lot sir.