Composite columns are constructed using various combinations of structural steel and concrete in an attempt to utilize the beneficial properties of each material. The interactive and integral behavior of concrete and the structural steel elements makes the composite column a very stiff, more ductile, cost effective and consequently a structurally efficient member in building and bridge constructions.

Mainly three types of composite column sections are used in high-rise building construction.

composite-column

In early 1900's, concrete was used to encase steel columns and beams, and as a filler material for floor systems. In 1907, the first experimental test was carried out by Emperger on built up composite columns under concentric load. Experimental investigations on concrete encased steel composite columns have been conducted by different researchers since long before. Analytical method was developed in early 1900 to investigate the behavior of FEC columns. On the other hand numerical simulations of reinforced concrete structures using finite element method, witnessed a remarkable advancement since 1990. Though, experimental research is costly and time consuming than numerical research, yet the progress in numerical studies are comparatively less. Recently, a nonlinear finite element models investigating the behavior of concentric and eccentric axial load of FEC columns was developed by different researchers. The design of composite columns has been addressed by a large number of design specifications. 

References

  • Soebur Rahman, Md. (2016) "Behaviour and strength of fully encased composite columns"