In the nonlinear analysis of masonry infilled RC frame structures, simple strut models are often adopted to represent the masonry infill, particularly in the case of extensive parametric numerical studies. Therefore, a careful definition of the corresponding strut properties is of exceptional significance for achieving a realistic building response. A method for evaluation of masonry infill strut properties is proposed and applied in this paper, based on the interpretation of results obtained by cyclic in-plane testing of single-storey, single-bay bare and infilled RC frame specimens.
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