Frame Structures

A frame structure is a structure where at least one of its members is a multiforce member. A multiforce member is defined as a member with at least three forces acting on it or with at least two forces and at least one couple acting on it. A load can be applied at the members in a frame structure, whereas a truss can have loads on joints only. In a frame, if a non-loaded member is pin-connected, then that member can be assumed to be a two-force member. The structure has all joints pin/hinge-connected and there is no transverse load inside the member; there is only one load at the joint. Therefore, all members are two-force members and it is a truss. A frame structure is supporting a concentrated load. Determine the horizontal and vertical components of force that the pin at C exerts on member BC and the member force at AB.