this is a finite element method problem,see the pictures with the link

http://home.attbi.com/~josephsieh

PROBLEM1:(Figure 1a,1b and truss_3d program in the attachmnt)

Analyze the truss  use truss_3d (in the attatchment). confirm the stress in 

element `A` by long hand calcaulation,including the determination  of the 
 
h-vector.           
          E=30*10^6 ,all area =Ao so that vA=1.5''(Vertical deflection  at point A)
 
                    PS: 1.use the truss_3d program to get the displacement 
                           2.need to find Ao
                           3.h-vector (see the attachment)
                           4.I want to get the answer within 2 or 3 days