ABSTRACT
By these assumptions, the analytical model of the structural element for rectangular, I and T shape cross-section, is a generalization of the truss model that replaces all the components (compressed chord, tension stringer, strut, and tie) by uniform stress-fields. The general criterion adopted consists in dividing the basic structural element cross section in several layers not defined a-priori, subjected to uniform distributions of stresses (normal σ, shear τ, or both), to obtain as a whole the equilibrium with the internal actions N, M, V. This approach, typical for design of in plane loaded plates, has been proved to be equivalent to the stress-fields approach. Any number of subdivisions of the cross section may be assumed, provided that the basic structural element is in equilibrium.
