Président du jury : J.-P. Banâtre ; Rapporteurs : G. Winskel, J. Mairesse ;Examinateurs : A. Benveniste, J.-P. Katoen, V. Kaimanovitch, S. HaarFor distributed monitoring of large networked systems(e.g., telecommunication networks and service networks)it is useful to study concurrency models under the trace semantics,to avoid the state explosion problem. We propose a probabilisticextension of event structures and safe Petri nets (Markov nets).A Strong Markov Property is shown for the model of Markov nets, with applications to recurrence theory for nets. We show the Strong Law of Large Numbers for concurrent systems with enough synchronisation properties, with application to statisticalestimation of local parameters.Pour la gestion de grands ...