Vibration Feature Monitoring of Damaged Caisson-Foundation System based on Pseudo-Wave Excitation

In this study, a novel vibration characteristic monitoring technique based on pseudo-wave excitation is presented to identify damage in caisson-foundation system, most of which are located in underwater environments. Firstly, a theoretical approach is presented to model vibration responses of caisson-foundation system. Secondly, a lab-scale vibration experiment is performed on a model caisson-foundation system. Changes in vibration characteristics are measured before and after foundation damage and are analyzed in modal domain accordingly. Finally, the changes in vibration characteristics induced by the foundation damage are quantitatively analyzed through changes in frequency responses caused by the damage.