Dynamic analysis of an inflatable dam subjected to a flood |
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Authors: | K Lowery S Liapis |
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Affiliation: | (1) Aker Engineering, 11757 Katy Freeway, Suite 1300, Houston, TX 77079,;(2) Offshore Structures, Shell Oil Company, 3737 Bellaire Blvd, Houston, TX 77001, |
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Abstract: | A dynamic simulation of the response of an inflatable dam subjected to a flood is carried out to determine the survivability
envelope of the dam where it can operate without rupture, or overflow. The free-surface flow problem is solved in two dimensions
using a fully nonlinear mixed Eulerian-Lagrangian formulation. The dam is modeled as an elastic shell inflated with air and
simply supported from two points. The finite element method is employed to determine the dynamic response of the structure
using ABAQUS with a shell element. The problem is solved in the time domain which allows the prediction of a number of transient
phenomena such as the generation of upstream advancing waves, the dynamic structural response and structural failure. Failure
takes place when the dam either ruptures or overflows. Stresses in the dam material were monitored to determine when rupture
occurs. An iterative study was performed to find the serviceability envelope of the dam in terms of the internal pressure
and the flood Froude number for two flood depths. It was found that existing inflatable dams are quite effective in suppressing
floods for a relatively wide range of flood velocities. |
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