Page - 1186 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- VIBRATIONS IN LARGE DAMS. MONITORING AND MODELLING* Sérgio OLIVEIRA Research officer at Concrete Dams Department, NATIONAL LABORATORY FOR CIVIL ENGINEERING (LNEC), LISBON André ALEGRE PhD research fellow at Concrete Dams Department, NATIONAL LABORATORY FOR CIVIL ENGINEERING (LNEC), LISBON PORTUGAL 1. INTRODUCTION Large dams are civil engineering structures of great importance and present a high potential risk, given their relevant contribution to populations and the costly damage that would result from a collapse situation. Therefore, in the scope of dam safety control, knowledge regarding the dynamic behavior of dams must be continuously updated and improved, relying on the combined use of advanced vibrations monitoring systems and accurate numerical models of dam-reservoir- foundation (DRF) systems (Fig. 1) [1,2,3]. Regarding the monitoring systems, it is important to use quality equipment for measurement, transmission and storage of the recorded data, as well as the appropriate computer software to collect and process said data, and hence analyze/manage the obtained results, with the latter representing a major issue when intending to implement such a system. As for numerical modelling, this is an area that still presents important challenges due to the complexity of DRF systems, namely considering the effects of the water level variations, the dynamic reservoir-dam interaction and the reservoir hydrodynamic behavior, the support conditions, among others. * Vibrations dans les grands barrages. Auscultation et modélisation 1186