Numerical studies for a better understanding of static ice loads on dams
| Autor: | Alain Côté, Brian Morse, Ekaterina Kharik, Varvara Roubtsova, Mario Fafard, George Comfort |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Engineering
010504 meteorology & atmospheric sciences business.industry 020502 materials Cold climate 02 engineering and technology Structural engineering 01 natural sciences Finite element method 0205 materials engineering Process mechanism Structural stability Geotechnical engineering business 0105 earth and related environmental sciences General Environmental Science Civil and Structural Engineering |
| Zdroj: | Canadian Journal of Civil Engineering. 45:18-29 |
| ISSN: | 1208-6029 0315-1468 |
| Popis: | It is important to anticipate potential maximum ice loads to ensure the structural stability of dams in cold climates. Finite element modeling (FEM) can provide some insights into process mechanisms. Four important ice-loading events on dams are presented and simulated. The measured loads were caused by the thermal expansion of ice together with intermediate water level fluctuations. Only the thermal expansion is modeled by the FEM, but the impact of water level fluctuations can increase lateral confinement that increases the predicted load by 36% to 106%, particularly when the cover contains mostly columnar ice. It is demonstrated that the presence of snow ice in the cover can decrease the predicted load by 35% to 53%. The study also demonstrates how initial stresses in the ice can affect the ultimate load and show that the very-difficult-to-manage delayed-elastic strain term need not be included in the material model where preliminary results suffice. |
| Databáze: | OpenAIRE |
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