Joint application of non-invasive techniques to characterize the dynamic behaviuor of engineering structures.

The present paper aims at analyzing the potentialities of a new technological approach for the dynamic characterization of civil infrastructures. The joint approach combines conventional, non-conventional and innovative techniques in order to set up a non-destructive evaluation procedure at a multi-scale and multi-depth levels (i.e. with different degrees of spatial resolution and different subsurface depths). The aim of this paper is the estimation of fundamental dynamic parameters of two bridges, selected as test bed site in the ISTIMES project (EU – 7th Framework Program), by the joint application of fast executable, non-invasive techniques. In particular for Sihlhochstrasse Bridge (Switzerland), Ground-Based microwave Radar Interferometer technique has been applied with a high-frequency thermal camera to measure the oscillations due to traffic excitations; for Musmeci bridge the microwave interferometry radar technology was jointly applied with a consolidate technique such as the Ambient Noise Standard Spectral Ratio.