ABSTRACT
The simplified design method is applicable for composite columns of doubly symmetrical and uniform cross-section over the column length. This method is based on some assumptions about the geometrical configurations of composite columns. Additionally, it makes use of the European buckling curves for bare steel columns. Based on test data for composite columns, the thickness limit of the concrete cover of composite columns is obtained. The thickness of the concrete cover of the steel section is required for design resistance to fire. For long-term loading, the creep and shrinkage of concrete will reduce the effective elastic flexural stiffness of the composite column. The strain-compatibility issue between steel and concrete materials must be observed. The strain-compatibility method may be used to select the steel grade and concrete class for the design of steel-reinforced concrete (SRC) columns to avoid crushing of the core concrete before the steel yields.
