ABSTRACT
There are many planar or spatial frames that are better modelled by 1D finite elements (FEs) instead of the known solid or shell elements.
There are two main groups of 1D FEs used by SW Simulation. The structure in Figure 8.1a is built of 1D elements connected to each other
through joints, which are designed in a way that no moments develop in them. We are not interested how these joints are implemented in the real structure – through welding, through bold connection or through another way. More important is that this structure is exposed only to forces applied at the joints. Thus, each member of the structure is either tensed or compressed. The only inner force that develops in the member is the axial force. This axial force is constant along its length and generates an axial stress that is uniform throughout the cross section. The used structural 1D members are known as trusses. Trusses are commonly used in structural applications such as bridges, roofs, etc.
