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Shape Optimization of Concrete Gravity Dams Using Performance Criteria Rules

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Author Affiliations

  • 1 Islamic Azad University, Zanjan Branch, IRAN

Res. J. Recent Sci., Volume 3, Issue (11), Pages 92-97, November,2 (2014)

Abstract

Shape optimization of concrete dams is a constraint nonlinear optimization problem. Since the failure mode of the monolith in concrete gravity dams is in tension, one of the main constraints is the tension stress limit under seismic loads. There is a new approach to check if the dam performance is safe andit is a more realistic method to observe the behavior of dams under earthquake load. According to this approach, the cumulative duration of the dam which passes the specific tension value during earthquake, should be below the allowable duration. This allowable duration is a function of the specific tension value.In this research, an innovative objective function was used to optimize the shape of concrete gravity dams by applying the new approach. This new objective function sets as one of the objective functions in multi objective method.A comparison between using this approach with multi objective and constrained optimization method in the rate of convergence reveals the advantage of employing the new objective function to find the optimal shape of concrete gravity dams under seismic loads.

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