2.8-2.16 For the spring assemblages shown in Figures P2-8 through P2-16, determine the nodal displacements, the forces in each element, and the reactions. Use the direct stiffness method for all problems. 10,000 N/m 30.000 N/m 10,000 N/m 450 N www Figure P2-12 10,000 N/m 450 N Figure P2-12 30.000 N/m 10.000 N/m 60 kN/m 60 kN/m 60 kN/m 60 kN/m 5 kN wwwww Figure P2-13 4000 N/m 義 4000 N/m 100 N 200 N Figure P2-14