Abstract
Effects of masonry infills on the seismic vulnerability of steel frames is studied through multi-scale numerical modelling. First, a micro-modelling approach is utilized to define a homogenized masonry material, calibrated on experimental tests, which is used for modelling the nonlinear response of a one-story, single span, masonry-infilled portal under horizontal loads. Based on results of the micro-model, the constitutive behavior of a diagonal strut macro-element equivalent to the infill panel is calibrated. Then, the diagonal strut is used to model infill panels in the macro-scale analysis of a multi-span multi-story infilled moment-resisting (MR) steel frame. The seismic vulnerability of the MR frame is evaluated through a nonlinear static procedure. Numerical analyses highlight that infills may radically modify the seismic response and the failure mechanism of the frame, hence the importance of the infill correct modelling.
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Acknowledgments
Federico Margiacchi thankfully acknowledges the support and suggestions of Prof. Dr.-Ing. Wolfhard Zhalten and Dr.-Ing. Renato Eusani during his internship at EZI Ingenieurgesellschaft mbH, Solingen, Germany.
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Margiacchi, F., Salvatori, L., Orlando, M. et al. Seismic response of masonry-infilled steel frames via multi-scale finite-element analyses. Bull Earthquake Eng 14, 3529–3546 (2016). https://doi.org/10.1007/s10518-016-0012-7
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DOI: https://doi.org/10.1007/s10518-016-0012-7