Towards a simple calibration of a scour-depth sensor
Résumé
This extended abstract presents an innovative method for scour monitoring, based on the dynamic response of a bridge pile embedded in the riverbed. Apart from the mechanical and physical characteristics of the pile itself, soil-structure interaction (SSI) affects the dynamical behaviour of the system. This may result in a sensibility of the eigenfrequencies of the pile to soil conditions. As a consequence, analytical and numerical developments are carried out for an Euler-Bernoulli beam model (representing the pile), which is embedded in a Pasternak soil ( springs with a shear layer) for SSI. Using Hamilton’s Principle and endowing the non-linear boundary conditions, system frequencies are derived by seeking for non-trivial roots of the characteristic equation of the system.