Traditional infill materials considerably influence the holistic response of framed structures due to their increased strength and stiffness. At present, aerocon autoclaved aerated concrete (AAC) blocks have widespread use around the world as a prospective infill material. Hence, a smaller scale prototype of a RC frame with Reinforced Aerocon Block Infill was constructed in the laboratory to evaluate its performance under lateral loading. Also, to enhance the load carrying capacity and stiffness characteristics, RC frame with Double Diagonal RC Strut was constructed and tested under lateral loading.This study is intended to investigate the behaviour of RC Frame with Reinforced Aerocon Block Infill and RC Frame with Double Diagonal RC Strut under lateral loading. The load-carrying capacity, Stiffness degradation, Ductility factor , Cumulative ductility factor and Energy dissipation capacity of the RC frames had been documented. The response of the frames showed the complete behaviour of the RC frames under lateral loading. the infill contribution to the overall structural performance, significant enhancement of stiffness, strength and energy dissipation of frame is evident. Compression diagonal failure was eliminated in the brick infill by the presence of reinforcement layers.