3-D simulation of shock waves generated by dense explosive in shell structures

In this paper we want to analyse the behaviour of spatial shell structures subject to multi-physics actions. Other thanthe normal operating loads we analysed the accidental effects generated by a thermal gradient simulating the effectsof a fire load, and also the effects generated by a pressure wave simulating an explosion. The problem was firstanalysed in its theoretical form, then a numerical model was developed and implemented through a finite elementanalysis. This modelling and simulation allows detecting a real scenario, e. g. railway tunnels with reinforcedconcrete structure that, as a result of accident, is subject to a scenario generated by fire and subsequently to explosion.In particular, the first stage of analysis involved aspects of thermal analysis and after the structural problem wastackled analysing the tensions in the structure generated by the effect of temperature-pressure generated by the fireand by the instantaneous pressure wave generated by the blast.