In this paper we want to analyse the behaviour of spatial shell structures subject to multi-physics actions. Other than the normal operating loads we analysed the accidental effects generated by a thermal gradient simulating the effects of a fire load, and also the effects generated by a pressure wave simulating an explosion. The problem was first analysed in its theoretical form, then a numerical model was developed and implemented through a finite element analysis. This modelling and simulation allows detecting a real scenario, e. g. railway tunnels with reinforced concrete 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 was tackled analysing the tensions in the structure generated by the effect of temperature-pressure generated by the fire and by the instantaneous pressure wave generated by the blast.
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