Parametric analysis of multi-ring arches

Among a majority of build heritage that cover large spans are constructed with curved masonry elements such multi-ring arches in order to achieve bigger overall thickness. The various methods of construction used for multi-ring arches have a significant impact on the outcome of their ultimate capacity to external actions. Since such structures consist of separate rings that interact through interface contacts, the disposition of the units and the internal mechanical parameters such as friction are of great influence. Furthermore, it is very evident that also geometrical characteristics play a major role on the behavior of such structures. A full combination of these parameters, namely, friction angle, disposition and size of blocks, number of rings and span, are considered in the assessment of multi-ring arches under the vertical load at quarter span utilizing an in-house code that follows the upper bound limit analysis approach. The significance of each parameter is shown after their combination of effects in terms of collapse multipliers that are categorized as per respective influencing parameters. It is shown that for various spans and different geometries, the interlocking effect from the disposition of units and the friction angle, influence the whole structural behavior.