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solution of this example

solution of this example

solution of this example

(OP)
hi!
i am confused with solving this example, and do not know what is wrong;

the question is example 6-005 (   http://www.docstoc.com/docs/9914591/Problem-6-005    )

What i did is:(unites are set kips-in-F)
1)Po(t)=
choosen sine function for time history
 
2) Ks = 100  in linear case
3) Kd =10000 in nonlin
3) Cd= 1    in nonlin
4) mass =1
5) the sping and damper are drawn as a supports i mean using (Draw one joint link   ) command

the attached file will help for well undertsnding.

please help me!

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