ABSTRACT The Reinforced Concrete (RC) systems are composed of different structural RC members such as beams, columns, shear walls, etc. Damage in RC members is found in the form of cracks, compression failure, reduction in effective area etc. Due to the presence of damages, there is a change in the dynamic behaviour. In the present work, the dynamic behaviour of undamaged and damaged RC multi-storey structures is studied with different damage locations in beams and columns at different stories. The damage is introduced by reducing Young’s modulus of concrete by 25%. The critical damage level is identified by using modal analysis. The damage severity in the columns and beams varied from 25% to 75%. The modal analysis and lateral load analysis are carried out to understand the dynamic behaviour of damaged structures. The Equivalent Static Method (ESM) is considered for earthquake analysis as per IS 1893 (Part −1): 2016. Analysis is done by using ETABS software. The natural frequency and time periods are considered as dynamic parameters. From the results, it has been observed that, there is a change in the natural frequency of the structural system with the introduction of damage of certain severity and at a particular location.