Divide the axially loaded rod shown in Figure 1.15 into two elements of equal length with node…

Divide the axially loaded rod shown in Figure 1.15
into two elements of equal length with node

    numbers as shown in Figure 1.16.

(a) Write the stiffness matrix for each element.

(b) Merge the element stiffness matrices to obtain the
global 3 by 3 stiff-ness matrix for the

     unconstrained rod.