structural model

A structural model is a mathematical idealization of an actual structure. The model allows us to predict how the actual structure will behave when it is loaded. A structural model of a truss has the following idealized characteristics:

1. It is composed of , interconnected at .
2. Each member is connected to exactly two joints, one at each end.
3. The joints are assumed to act like hinges; that is, they hold the members together, but do not prevent the ends of the members from rotating with respect to each other.
4. The members only carry axial force--either or . They do not bend.
5. Loads can be applied to the structure only at the joints.
6. Supports can be placed only at the joints.