solution of this example

[HalimWardag]

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 isunites 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!