Abstract : An unconventional interface is described whereby infill panels are separated from the plane Reinforced concrete (RC) frame employing an adaptive layer of Pneumatic interface material whose interface property can be changed by varying the interface pressure. Using fully infilled RC frames subjected to cyclic in-plane load within the elastic limit, the theory was able to verify experimentally. The results from tests show the interface pressure optimization and the pressure pattern for the better ductile behaviour of the infilled frames. Conclusions Up to modest drifts, the suggested method has an excellent perspective in decreasing the interaction between the structure of the infill and, by extension, the disintegration of the infills. The interaction exists once the interface is compressed and at increased drift. In this way, an infilled frame with a Pneumatic interface can act as a bare frame and infilled frame with interface pressure variations.