Historical masonry arch bridges are an elementary part of the European infrastructure landscape. However, due to increased loads and various changes in the use of these structures; their behavior under these changing conditions needs to be understood in order to ensure safety of the end users. Monitoring of the performance of such structures allows practitioners the opportunity to understand the soil-structure interaction in a more accurate way in order to simulate better their actual performance. This paper describes a 3D finite element model, which analyses the interaction of the masonry structure with its backfill, embankment and foundation. Jointed Rock model was used to model the anisotropic nature of the masonry, which allows the determination of more accurate stress and strain concentrations where cracks and discontinuities in the masonry structure occur. The modelling approach is described in the paper and the computed behavior is compared with a masonry arch bridge where measurements have been undertaken. The findings of this type of study can be used to confirm safety of any operational changes, plan future maintenance requirements and monitoring and repair regime of masonry arch bridges.
