Seite - 1191 - in Book of Full Papers - Symposium Hydro Engineering

matrices using complex modal coordinates [9,10,11]. The implemented coupled approach results in the computation of non-stationary vibration modes, which are usually associated to systems with non-proportional damping, as is the case of arch dams, whose dynamic behavior is highly influenced by dynamic water- structure interaction. Fig. 5 DamDySSA2.0. Coupled model and state space approach. 5. MODAL IDENTIFICATION RESULTS. COMPARISON WITH NUMERICAL RESULTS In this chapter the modal identification outputs are compared with numerical results computed using DamDySSA2.0, to demonstrate the potential of the combined use of monitoring and modelling to support dam safety control, as well as to validate and calibrate the numerical models and implemented formulations. For the case of Cabril dam, it is necessary to analyze the identified frequencies with great care, in order to distinguish between the dam vibration modes and vibrations related to the intake tower motion or the power groups. 1191