By assigning a cross-section and the related material, the member gets a stiffness. Members are always connected by the nodes only.
Members do not have any lateral expansion. Thus, they are an idealization of real structural components.
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions