[ANSWERED] 1. Evaluate the stiffness matrix for the elements shown in Figure P11–1. Let E = 30 10 6 psi and n =

1. Evaluate the stiffness matrix for the elements shown in
Figure P11–1. Let E = 30
10
6
psi and n =
0:3:
2.
For the elements shown in Figure P11–1, assume the
nodal displacements have been determined to be u
Determine the strains and then the stresses in the elements.
Let E = 30
10
6
psi and n = 0:3.
3. Show that for constant body force Z
b
acting on
an element (X
b
= 0 and Y
b
= 0),
where (f
bi
) represents the body forces at node i
of the element with volume V.