This study has been carried out to evaluate the method of design of the composite column of reinforced concrete and steel structural sections in the international Codes. Studying and verifying the limit of the ratio of steel section area to total gross section area is the important aim of this research. AISC, 2005 was specifying this limit by 1.0%. Various ratios of steel core area to total gross section area were studied along with rang of concrete strength by the help of finite element software. The results show that the ratio of the steel core area to the total gross section area (As/Ag) should be replaced by the ratio of the ultimate capacity of the steel core to the total ultimate capacity of the complete composite section (Pys/P0). The new ratio takes into account the effect of relative strength between steel and concrete. The proposed limit for (Pys/P0) is between (25%) to (30%).
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