Nonlinear modeling, numerical validation, and feasibility study of shape memory alloy hangers for mitigation of flutter and vortex-induced oscillations in suspension bridges.
A parametric nonlinear model of suspension bridges including the presence of Shape Memory Alloy (SMA) hangers will be developed to study and suppress instability phenomena induced by self-excited aerodynamic loads and vortex-induced parametric forces. The starting point of the proposed research will be the nonlinear model developed by the Proponent of this research project (and his co-workers) to study flutter in suspension bridges and its control via hysteretic tuned mass dampers. The project will lead to an advance of the state of the art in several aspects pertaining to various topics. First, it will be developed a parametric tool able to investigate the nonlinear dynamic behavior of suspension bridges and to study the bifurcative scenarios (Hopf instability and parametric instability) arising from the wind-structure interaction by means of advanced analytical and numerical techniques, such as asymptotic and continuation analyses. Second, the project will propose a novel approach for the vibrations control in suspension bridges based on the actuation, via temperature variation, of suspension elements made of smart materials (SMA). Finally, after an accurate numerical validation of the model, a detailed study on the feasibility of the proposed control system will pave the way for the development of the technology suitable for its effective realization.