Computational framework for discontinuous modelling of masonry arch bridges

An investigation into using continuum/discontinuum based techniques to analyse backfilled masonry arch bridges is presented. Three different computational modelling tools, discontinuous deformation analysis (DDA), discrete element based analysis using particle flow code and the non-linear finite element analysis using diana have been utilised for this purpose and comparison are made with an experimental model developed at Edinburgh University. Load dispersal through the backfill in the DDA model is improved by using Voronoi tessellation based techniques and the displacement control loading have been utilised in all cases to trace the structural response beyond the collapse load and to identify the collapse mechanisms. The capability and limitations of the methods are demonstrated and some sensitivity analyses are also presented for the semi-circular arch model.