Numerical analyses of the Bargower arch bridge

The reported information of a full scale load test to collapse on a single span arch bridge, carried out within the aim of a research program developed by the Transport and Road Research Laboratory in the UK, is taken as reference to assess the ability of finite element models to reproduce the overall behaviour of stone masonry arch barrels. Two different bi-dimensional finite element models are used: (i) a simplified model where the infill behaviour is simulated with non linear springs acting in the horizontal direction and (ii) a refined model where the infill is discretized in the finite element mesh. In the latter case the non-linear behaviour of the soil is simulated with a plasticity model. In both cases the adopted masonry modelling consists of a discrete approach, in which the joints are represented by initial zero thickness interface elements and the regularly cut to shape voussoirs are represented by continuum linear-elastic elements. The numerical results are compared to the data obtained from the experimental test and the mechanical behaviour of the masonry arch bridge is discussed.