SUMMARY
To design columns with reinforced concrete material is often used in building construction so that reinforced concrete has several advantages, it is the availability of material, but require a large dimension in holding high capacity. To reduce the dimensions of the column structure can be designed with a composite structure. In this study, an analysis will be carried out to determine the difference in dimensions that can be provided by reinforced concrete columns and composite columns holding an equivalent nominal capacity. This analysis was carried out in a case study of the planning of a 7-story lecture building. The initial design of the column applied is a reinforced concrete column which will then be redesigned with a composite structure using a WF steel profile. Based on the results of the research analysis shows that in holding the nominal capacity equivalent, the dimensions of the composite column used are smaller than the reinforced concrete column. In addition, the volume requirement of the material is also lower, this indicates that the composite column is good enough to be applied in building planning.