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The seismic performance of older infilled frame reinforced concrete structures is influenced by the interaction of different components and mechanisms and is highly sensitive to several modelling parameters. A probabilistic response sensitivity analysis is performed on a case study consisting of an infilled frame structure incorporating state-of the art models of most significant sources of nonlinear behaviour: 1) axial-moment interaction in the frame components, 2) cracking and crushing of infill panels, and 3) infill-frame interaction induced shear failure of columns. Nonlinear fiber section beam column elements are assembled with eccentric ASCE41/FEMA356 infill strut models, hysteretic shear models of captive columns based on EC8 shear strength, and are processed through pushover-based tornado analyses. Probabilistic sensitivity to material parameters at operation, damage, life safety and collapse limit states indicates that modelling parameters of infill and mass source have a key impact on the system response.

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