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According to the purpose of Theme A of the 11th ICOLD Benchmark Workshop on Numerical Analysis of Dams, the effects of concrete swelling due to Alkali-Aggregate Reaction (AAR) on the structural behaviour of Kariba dam was were studied. The analyses have been carried out using the evaluated by means of a macroscopic model, accounting for stress dependent AAR induced expansion, available in the library of CANT-SD, RSE in-house FEM code CANT-SD, a FEM software specifically designed developed by RSE for non-linear static and dynamic analyses of dam-reservoir systems., and provided with a macroscopic model for stress dependent AAR induced expansion. Several simulations have been performed with the aim of calibrating the stress-dependent model in order to reproduce the trend of Following the model calibration step, based on the surveyed comparison with the observed behaviour of the dam from 1963 to 1994, .a forecasting step aimed at evaluating the further development of swelling effects, The stress state of the structure affected by AAR was followed out in comparison with the stress state without swelling. The analysis with the calibrated model was carried on out up to 2010up to 2010 to evaluate the further evolution of the drifts and of the stress state caused to the dam by the following development of the AAR expansion. The model provided a good agreement with measured displacementsThe applied constitutive model, although simply based on mechanical expansion, has allowed computing drifts in good agreement with monitored ones, , confirming the stress dependency assumption on the expansion effects, confirming the anisotropy of actual expansion and its dependence on that of stress.
31 Dicembre 2011
Studi su potenziali sviluppi delle energie rinnovabili (P04PROD)