14 582 CHAPTER 14 TRUSS ANALYSIS USING THE STIFFNE PROBLEMS 14-1. Determine the stiffness matrix K for the truss. Take A = 450 mm², E = 200 GPa. Assume all joints are pin-connected. 14-2. Determine the vertical deflection of joint 1 and the force in member 2 of the truss in Prob. 14-1. 14- Tal 14 an E 4 m 3 m 48 4 4 m Probs. 14-1/2 1 20 kN 1- C