In determining the seismic performance of reinforced concrete (RC) structures in na tional and international seismic code, it is desired to use effective section stiffness ofthe cracked section in RC structural elements during the design phase. Although theeffective stiffness of the cracked section is not constant, it depends on parameterssuch as the dimension of the cross-section, concrete strength and axial force actingon the section. In this study, RC column models with different axial load levels, con crete strength, longitudinal and transverse reinforcement ratios were designed to in vestigate effective stiffness. Analytically investigated parameters were calculatedfrom TBEC (2018), ACI318 (2014), ASCE/SEI41 (2017), Eurocode 2 (2004) and Eu rocode8 (2004, 2005) regulations and moment-curvature relationships. From thenumerical analysis results, it is obtained that the axial load level, concrete strength,longitudinal and transverse reinforcement ratios have an influence on the effectivestiffness factor of RC column sections. The calculated effective stiffness for RC col umns increases with increasing transverse reinforcement ratio, longitudinal rein forcement ratio and concrete strength. Due to the increase of axial force, effectivestiffness values of concrete have increased.