Lead Rubber Bearing Properties in SAP2000

[pezhmankhan]

Input your data in INPUT sheet and get outputs in SAP2000 sheet.

I'm waiting for your opinion.

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[ruaumoko]

Dear pezhmankhan ,
thank you very much for this useful file.

I'm wonder if you could advise where is coming the value of effective damping (0.038) of your example (tab sap2000 : for U2 & U3).
what units should have this property ?

In the input tab I couldn't find this value to see the equation used. Or is a typo and should be 0.088 ? please confirm

really appreciate your comments,
thanks in advance,

[pezhmankhan]

Hi,
When you defined effective damping of isolators in SAP2000 (in the horizontal direction, U2 & U3), you should deduct the damping ratio of superstructure from it. Software will automatically add damping ratio of superstructure to effective damping of isolator.
So I put unit to kN-mm and after that I deductive 0.05 from effective damping to consider 5% superstructure damping.

[ruaumoko]

Thanks for your time ! pezhmankhan,

This mean, the unit is a ratio in the input of SAP2000?
Im a bit confuse, when I read in the CSI knowledge base website where explains the unit of effective damping is Force-Second/Length or Force/Velocity”

I misunderstand something?

thank you very much,
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[pezhmankhan]

Yes, You are true.
But in HOLMES spreadsheet they defined effective damping such this. And because this spreadsheet is written by Trver Kelly, I am sure that this way is true.