A structure is an assembly of various elements or components which are fastened together through some type of connection. If connections are not designed properly and fabricated with care, there may be a source of weakness in the finished structure, not only in their structural action but also because they may be the focus of corrosion and aesthetically unpleasing. Where as the design of main members has reached an advanced stage, based upon theories which have been developed and refined, the behaviour of connections is often so complex that theoretical considerations are of little use in practical design. By their very nature, connections are a jumble of local effects. A building structure consisting of a steel frame work skeleton is made up of the following structural elements or members. Discuss in detail the importance of the following members in steel design.
i) Flexural members; beams or girders
ii) Tension members
iii) Compression members: columns, stanchions, struts 

iv) Torsional members
v) Elements of foundation structure