On the use of Somigliana dislocations applied to masonry arches

This work ranks among the studies on masonry structures, in the hypothesis of a material considered to be absolutely No-Tension resistant. In particular and with reference to the recent scientific work of S. Di Pasquale (1997), our aim is to present a contribute which uses the theory of imparted "dislocations" for the analysis of masonry arches. For a better precision, this means to widen the possibility for the existence of a solution in elastic equilibrium also for those structures which are not subjected to assigned sistems of forces -surface, body and contact forces-, but to movements (defined "dislocations") assigned on previously defined zones of the same structures, movements which are able to produce a constraint. The correspondence among theorical solutions and some elementary examples has been verified using computational techniques, which allowed us to follow the development of the internal stress state -induced by the introduction of appropriate dislocations- and to check the progressive changes in the initial stress internal regime.