Stiffness proportional damping to zeroLength element

[susan]

Hi all,

As far as I know, OpenSees does not apply stiffness proportional damping to zeroLength elements. Is there any solution?

Thanks.

[fmk]

why don't you read the command manual .. instructions on how to add rayleigh damping is spelled out there ..
http://opensees.berkeley.edu/wiki/index ... th_Element

[susan]

Thank you, Frank.

Already I checked the manual. If I use "-doRayleigh", first Rayleigh command should be defined, so, it will apply to the whole of the model. But I just wanna apply 20% damping to the zeroLength element. How can I do this?

Thank you.

[fmk]

use a region command .. create the region with just the zero length elements and the specified rayleigh factors .. and do not use mass proportional damping term.

[susan]

Many thanks for your useful comments.