MODELLING UNCERTAINTY IN EXISTING ITALIAN RC FRAMES

Abstract eng:
This paper examines the uncertainty in the response of existing RC frames with masonry infill in Italy. This is done using a numerical modelling approach calibrated and validated against existing experimental test data, where the existing test data is used as a basis to gauge the uncertainty in the various parameters associated with the modelling of beam-column members, joints and masonry infill. The influence of the uncertainty in these parameters is then investigated through a quantification study allowing for the propagation of this modelling uncertainty to the response of the structure under seismic action to be quantified. This is performed for numerous different case study building typologies typically found in Italy. The result of this study is that typical values of dispersion associated with modelling uncertainty structures can be quantified in relation to the demand parameters typically of interest, such as peak storey drift and peak floor acceleration, in addition to the collapse capacity of the building. The impact of this study is that empirical values for these building typologies can be proposed to allow practitioners to adopt more reasonable and representative values of dispersion with respect to those available in the literature. The proposal of these empirical dispersion values fits directly into the broader frameworks typically adopted in the performance-based assessment of existing structures that aim to quantify the performance of buildings in terms of measures such as collapse safety and monetary losses.

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