IN-PLANE SEISMIC PERFORMANCE OF RC STRUCTURES WITH AN INNOVATIVE MASONRY INFILL WITH SLIDING JOINTS THROUGH NON-LINEAR ANALYSES

Abstract eng:
Within the European FP7 Project "INSYSME", the research unit of the University of Pavia has conceived a new seismic resistant masonry infill system with sliding joints, which allows in-plane damage control of the masonry and the reduction of the detrimental effects due to the panel-frame interaction. The system proposed ([1] and [2]) has been subjected to an extensive experimental campaign and both the in-plane and out-of-plane seismic behaviour of RC frames with the innovative infills with and without opening have been examined ([3] and [4]) In this paper, a study on the in-plane seismic performance of RC structures with the newly developed infills has been conducted through nonlinear static and dynamic analyses. The experimental cyclic in-plane response has been calibrated through numerical simulations of the tests by representing the masonry infill as two compressive diagonal struts pinned at its ends to the intersection of beam and column centrelines. Nonlinear analyses on 6-storey 3-bay RC frames designed for different levels of PGA have been conducted. Bare and infilled frames have been taken into account and various infilled configurations have been considered, also examining the case with and without openings. The results have permitted to study the influence of the infill on the global in-plane behaviour of the structure, in particular in terms of displacement and inter-storey drift demands and their reduction as respect to bare configurations. The definition of specific performance levels at the infill level according to the amount of damage attained in the cyclic in-plane tests ([3] and [4]), has allowed determining a consistent criterion for the attainment of the limit state conditions at the level of the building, considering the actual performance of the infills in the structures in terms of the drift demand versus capacity. Finally, a comparison between the results of the non-linear analyses on the structural configurations infilled with the innovative solution and with a “traditional” infill typology (double-leaf masonry in adherence at the RC structure [7]) has been performed, clearly highlighting the improvement of the in-plane seismic response of the newly developed system.

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