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Seismic Safety Assessment of Luzzone Dam: Finite Element Modelling

pubblicazioni - Memoria

Seismic Safety Assessment of Luzzone Dam: Finite Element Modelling

La memoria documenta le analisi numeriche dinamiche mirate alla valutazione della sicurezza sismica della diga di Luzzone in Svizzera, oggetto del tema A del 13° Benchmark Workshop ICOLD sull’analisi numeriche delle dighe. La valutazione è stata condotta seguendo sia la normativa Svizzera, sia quella Italiana. Alcune analisi di approfondimento hanno mostrato come per rappresentare adeguatamente il comportamento delle dighe ad arco sottoposte a sisma (in particolare se di forte intensità) sia necessario ricorrere a una modellazione non lineare.

The seismic assessment of Luzzone Dam, a large double-curvature concrete arch dam located in Switzerland, proposed as Theme A of the 13th ICOLD Benchmark Workshop on the Numerical Analysis of Dams, has been performed. Dynamic simulations have been carried out using the RSE in-house FEM code CANT-SD, specifically designed for dynamic linear and non-linear analyses of dam-reservoir systems and provided with acoustic compressible elements to model fluid-structure interaction.

The seismic verification has been performed according to the Swiss Directive by subjecting the dam-reservoir system to three acceleration time histories compatible with the site spectral response, evaluating the resulting stresses on the basis of the properties of the dam concrete and calculating the factors of safety against sliding and overturning of the upper part of the crown cantilever.

Additional analyses have been carried out and the results have been evaluated according to the Italian standards. Based on the results of the performed seismic assessment, some in-depth analyses, able to simulate the non-linear effects due to the opening and sliding of vertical contraction joints, have been performed to better represent the actual behaviour of the structure and conclude on its seismic safety.

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