International audienceAnalytical multi-physics models which include main sources of nonlinearities for nanoresonators electrostatically actuated are developed in order to assess complex dynamics in nanosystems beyond the Duffing critical amplitude. In particular, multistability is investigated for doubly clamped beams and cantilevers. The bifurcation topology of a particular multistable behavior (up to five amplitudes for a given frequency) is parametrically identified and experimentally validated
