P.8.1. The system shown in Fig. P.8.1 consists of two bars AB and BC, each of bending stiffness El elastically hinged together at B by a spring of stiffness K (ie., bending moment applied by spring = Kx change in slope across B). Regarding A and C as simple pin joints, obtain an equation for the first buck- ling load of the system. What are the lowest buckling loads when (a) Koo, (b) Elo. Note that B is free to move vertically. Answer: Kan jul. FIGURE P.8.1 P A Stiffness K P 1 2 Problems 303 EI 4EI EI P 114 하 글리