In the preceding chapters attention has been focused on the design of individual elements, beams, columns, ties and methods of connecting them together. In practice individual elements are assembled for structural use into frames of various kinds; in this chapter we examine the design of some simple combinations of components. The rules of component design still have to be observed but there is now the added complication of determining the way in which load is shared by the individual members and the interaction between them at the joints in the structure.