I know how to approach this problem. First, I will need to find the reactions at the supports. Then apply Joint or Section Cut Method to find the forces acting between the members. Then take the force acting on member b0b1 and plug in Euler Buckling equation, while choosing the correct effective length for the situation and determining the critical force. All the variables are given. Basically, I need to know if member b0b1 will buckle according to Euler buckling method. The problem I am having is the force applied on the ternary link. How does that force affect joints a1 and b1. Do I have to convert that force into moments about these two joints? Also for the fixed joint a0, will there be reaction in the x and y directions along with a moment. I think the orientation of member a0a1 and of the ternary link is what is throwing me off. Any help or suggestions would be greatly appreciated. Thanks.