Rayleigh Damping

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  • November 8, 2016 at 10:42 pm #24076
    Sunil
    Participant

    Hi

    How can I express the below values for damping in Opensees Navigator?

    rayleigh 0. 0. 0. [expr 2*0.02/pow([eigen 1],0.5)]

    Kind Regards,

    SUnil

    November 10, 2016 at 11:58 am #24079
    Andreas Schellenberg
    Keymaster

    Currently, it is not possible to specify Rayleigh damping based on a modal analysis programmatically. You will have to define and run a modal analysis first and then use the frequency results to define the Rayleigh damping for the subsequent transient analysis. The Rayleigh damping in OSN is specified when you define the analysis case. You can assign damping to a model as regions defined by nodes or elements.

    Define New Damping Parameters

    November 10, 2016 at 9:57 pm #24085
    Sunil
    Participant

    Thanks a lot

    October 9, 2017 at 10:03 pm #26832
    Binod Shrestha
    Participant

    Hi,

    What is the reasonable period to specify these damping values for 5% damping on precast concrete structures?

     

    Kind Regards,

    Binod

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