Sevier, G;
De Falco, A;
(2019)
Concrete gravity dams FE models parameters updating using ambient vibrations.
In:
Proceedings of the 3rd International Conference on Uncertainty Quantification in Computational Sciences and Engineering 2019.
(pp. pp. 286-297).
ECCOMAS Proceedia: Crete, Greece.
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CONCRETE GRAVITY DAMS FE MODELS PARAMETERS UPDATING USING AMBIENT VIBRATIONS_final.pdf - Accepted Version Download (818kB) | Preview |
Abstract
Most of the dams around the world were designed before the introduction of seismic regulations and without concerns about their dynamic behavior. The failure of a large gravity dam might have catastrophic effects putting at risk a large number of human lives, not counting the considerable economic consequences. Since there are no case histories of concrete gravity dams failed after seismic events, numerical models assume great importance for the evaluation of the seismic performance of such structures or to control them within a SHM framework. Several different sources of uncertainty are involved in numerical models of concrete gravity dams, their effects can be reduced by exploiting all available information about the structure. Ambient vibrations are an important source of information because they can be used to characterize the dynamic behavior of the structure. In this paper, a procedure, defined in the Bayesian framework, which allows calibrating the dynamic model parameters using ambient vibration is presented. Ambient vibrations are used to determine the modal characteristics of the system, by applying the Operational Modal Analysis (OMA), which are used in the updating process. The use of meta models based on the general Polynomial Chaos Expansion (gPCE) and a modified version of Markov Chain Monte Carlo (MCMC) allows both considering the SSI in the numerical model of the dam and solving the problem of coherence between experimental and numerical modes. Finally, the proposed procedure is applied to the case of an Italian dam showing the applicability to real cases.
| Type: | Proceedings paper |
|---|---|
| Title: | Concrete gravity dams FE models parameters updating using ambient vibrations |
| Event: | 3rd ECCOMAS Thematic Conference on International Conference on Uncertainty Quantification in Computational Sciences and Engineering |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.7712/120219.6341.18557 |
| Publisher version: | https://doi.org/10.7712/120219.6341.18557 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10092615 |
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