SUMMARYThis paper presents pseudo-dynamic test results on the in-plane seismic behaviour of inÿlled frames. Thirteen single-storey, single-bay, half-size-scale, reinforced concrete-frame specimens, most of which inÿlled with non-structural masonry made of perforated bricks and cement mortar are tested. The inÿlls are in contact with frames, without any connector; openings are not covered. The frames are di erent in their strength and details, reinforcement grade, and aspect ratio. Seismic input is the 1976 Tolmezzo (Friuli, Italy) ground acceleration, to which specimens are subjected two times: virgin and damaged by the previous test. The global seismic response of initially virgin inÿlled specimens considerably di ers from that of bare specimens. This follows a dramatic change of properties: compared to a bare frame, the initial sti ness increases by one order of magnitude, and the peak strength more than doubles. The peak drift lessens; however, the displacement ductility demand does not. The energy demand is greater. Nevertheless, the in uence of inÿll decreases as damage proceeds. Displacement time histories of damaged specimens are quite similar. At the local level, inÿll causes asymmetry and concentration of the frame deformation.
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