ABSTRACT
Numerical modelling forms a fundamental part of most masonry arch bridge assessments. However, the numerical models employed need to be validated against full-scale bridge tests, or, alternatively, against tests on scale models. This contribution describes a programme of tests carried out on medium-scale masonry arch bridges to explore the effects of internal spandrel walls and masonry backing on structural performance, since the effects of these elements appear to have been little investigated previously. The tests have provided high quality benchmark results that have been used to validate numerical models developed using the discontinuity layout optimization (DLO) limit analysis method. It has been found, both experimentally and numerically, that internal spandrels and backing can contribute significantly to bridge load-carrying capacity.
