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Full Version: modelling seismic response of unreinforced masonry infilled reinforced concrete momen
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An attempt has been made to model the hysteretic characteristics of unreinforced masonry infilled reinforced concrete moment-resisting frames for the first time. The difficulties encountered in the modelling are discussed and a new model, The Trilinear Hysteresis Model has been proposed for capturing the hysteretic response of infilled frames. This model incorporates the stiffness and strength contributions of the masonry infill to the overall response of the frame. The critical parameters influencing the behaviour of masonry infill frames are identified, and a parametric study is conducted to study the affects of the same. The inelastic response spectra, and from those the ductility reduction factor spectra, are obtained for the Uttarkashi earthquake strong motion data and some other strong ground motions widely used in seismic analysis. Based upon the results of the study, it has been concluded that the presence of the infill significantly reduces the ductility demand on the frame members. The infill-to-bare frame stiffness ratio is observed to be the most influential
Reinforced concrete frames filled with masonry constitute a significant portion of the inventory of buildings in seismically active regions around the world. Although initial efforts to analyze the behavior of filled frames (eg, Polyakov 1960) go back more than half a century, modeling the interaction between frame members and masonry filler walls remains an area of active research. It is well known that the strength of a filled frame is not a simple sum of the strength of a bare frame and that of the filler wall due to the fact that the load resistance mechanism of a frame can change as a result of its interaction with the filling.