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Re: Modelling Rubber in SAP2000

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>I am right now doing a work on modelling a rubber material in sap2000.
Rubber is highly non-linear--a so-called super elasic material. Unless 
you're into non-linear modelling, it's nothing to start with. If you're 
using it for shock mounts or something of the sort, you can get by with 
including it as an equivalent elastic spring, based on a rated deflection 
for the load it's actually carrying (means you either have to run the 
problem twice or just be very very lucky). If you're doing any dynamics 
you should also be aware that natural frequencies don't exist in the 
usual sense for non-linear structures. Non-linear structures can 
resonate, but the frequency depends on the loading.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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