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In Japan, steel is mostly used to construct large-span buildings such as logistic terminals, office buildings, shopping malls, and medical facilities. However, in recent years with the fabrication cost of steel soaring, there is a concerted effort to reduce construction costs and at the same time increase productivity. Therefore, research investigations are being carried out and one of the methods involves using an innovative hybrid system where the columns are reinforced concrete and the beams are hybrid beams. In this study, concrete design strength, shear reinforcement ratio and length of RC section were altered to examine the structural performance of hybrid beams under flexural failure in a beam-column subassemblage. The results showed that ultimate flexural strength of a reinforced concrete section can be evaluated using an Architectural Institute of Japan abbreviated equation, and a coefficient of shear reinforcement of more than 2.5% will assure a plastic deformation capacity of more than 2%. [ABSTRACT FROM AUTHOR]