Seismic response of masonry-infilled steel frames via multi-scale finite-element analyses |
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| Authors: | Federico Margiacchi Luca Salvatori Maurizio Orlando Mario De Stefano Paolo Spinelli |
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| Institution: | 1.DICeA,University of Florence,Florence,Italy;2.DIDA,University of Florence,Florence,Italy |
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| 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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