It is conjectured that the infilled frames performed better.
How such an unfavourable element (infill) which detrimentally adds to the stiffness of the structure and causes the absorption of more seismic force, and at the same time is not strong enough to last for the entire seismic event, and even is not ductile to absorb seismic energy, could improve the overall performance.
The infill started to yield earlier as compared to the bare frame. The hinges form firstly in infill and then in frame elements due to the strut action of infill. Hence, infill fails first and after that yielding of beams and columns is observed which improves the overall performance of the structure during a seismic event.
I fully agree with Dr. Punashri. Further, if some kind of minimum reinforcement (horzontal, and possibly verical as well) is added in the inill walls, they will perform much better. Lateral collapse of infill is avoided in this manner. These bars should be properly anchored in the columns
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