Structural engineering is a sub-discipline of civil engineering in which
structural engineers are trained to design the 'bones and joints' that create
the form and shape of human-made structures. Structural engineers also must
understand and calculate the stability, strength, rigidity and earthquake-
susceptibility of built structures for buildings and nonbuilding structures.
The structural designs are integrated with those of other designers such as
architects and building services engineer and often supervise the construction
of projects by contractors on site. They can also be involved in the design of
machinery, medical equipment, and vehicles where structural integrity affects
functioning and safety. See glossary of structural engineering.