using finite element 

Use Direct Stiffness method to find the displacements, and reactions for the problem shown in Figure 1.1 Element m (kg) E (kPa) 0.3 1 2 3 0.3 0.3 29.5 x106 25.5 x106 19.5 x106 Formula: {f} = [K]{d} F = KAx = K(d2x - dix) k (N/m) 1000 500 500 ks 1 m, U