Abstract
A very important research direction in today's dam engineering is related to structural ageing of concrete dams and ways to monitor structural and material characteristics changes to reduce and manage the associated risks.In situ ambient vibration measurements used to identify the dynamic characteristics of the structure and the development of hybrid models (the mathematical model bounded to a certain in situ measurement program and calibrated using the recorded data) represent an appealing method for the evaluation of the safety reserves of concrete water retention structures. However, mathematical modelling can be done with varying degrees of complexity and the results obtained for the couple dam model - recorded data can significantly vary depending on the size and complexity of the analyzed model.The presented study, developed for Gura Raului buttress dam in Romania, consisted in 2 measurements campaigns and the development of 4 mathematical models, via the finite element method, with different degrees of complexity - a representative maximum height block, a spillway block, the whole spillway made of 3 identical blocks and the complete dam made of 22 blocks. The paper presents the in situ measurement results, the calibration of the maximum height block based on the first measurement data set and the analysis of the results obtained for the other 3 models compared with the recorded data.
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