ANALYSIS OF STEEL CASED-CONCRETE COMPOSITE COLUMNS USING UNIFIED DESIGN METODOLOGY

The use of steel cased-concrete composite columns and beam-column was
widespread in the recent two decades. The utilization of steel cased-concrete
composite columns and beam-column was developed to resume the column shutter
and thus, reduce the time of construction. The major identification of this steel casedconcrete
composite column is to create the concrete confinement and also, make the
case tube more stiffened due to the existence of concrete inside the steel case. The
composite eliminates the drawbacks of the two materials. The unified design
methodology (UDM) was developed, first, for flexural members. This methodology is
required for unifying the codes recommendations in simple and rational manner that
dose not violates the fundamental principals is an essential requirement. This
approach is also, acceptable for design of steel cased-concrete composite columns.
The key concept is the definition of the strength reduction factor for concrete inside
the case and steel case. The methodology of UDM, sections is divided into three
categories while, the steel cased-concrete columns is compression controlled.
In this paper, the application of the unified design methodology for steel caseconcrete
composite column was performed on circular and square cross section.
These circular and square sections are subjected to axial load with minimum
eccentricity. The (UDM) proposed in this paper was compared with the experimental
test results, recently found on literature. This methodology is compared with the
Egyptian Code design philosophy which has first publication for the first time on ECP
203-2007. A parametric study was performed to study the major parameter affecting
on the design of steel cased-concrete composite column and beam-column using
(UDM).