Investigation of Dynamics Behaviour of Concrete Gravity Dams due to Explosion Loading using Probabilistic Analysis

Jafari, Seyed Reza (2017) Investigation of Dynamics Behaviour of Concrete Gravity Dams due to Explosion Loading using Probabilistic Analysis. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

The increment in terrorist attacks has caused insecurity in the region, which needs to be predicted and prepared for malicious attacks, especially on infrastructure installations and networks in the country. One of the significant infrastructures of each country is the dams and split power plants set, which, damaging will have irreparable Physical and financial losses. Therefore, investigation of the behavior of important structures such as concrete gravity dam under explosion load is very importance. In this thesis, the dynamic behavior of a concrete gravity dam under a 1000 kg TNT explosion was simulated and evaluated, in which the model of the Koyna dam was simulated and evaluated in three different models. For behavior models, equations of state such as p- were used for concrete materials in the dam structure, JH2 for foundation bedding material, JWL for explosives and polynomial for reservoir fluid. The simulations results indicate weakness in the upper part of the dam, especially in the neck of the dam. There is also a serious and widespread injury in the near-explosive area that, when submerged explosives are located, impulse and pressure at a distance of 1 meter from the center of explosives are 12 times higher than that of the explosion in the air, in which due to that, the damages created are also spreading to a large extent. The severity and extent of damage in the mode of underwater explosion was such that it caused instability in the dam and exit the cycle of exploitation. By increasing the depth of the explosion center, the hydrostatic pressure of the water overcomes the pressure released from the explosion and reduces its pressure. Eventually the Six Sigma Analysis method used for probabilistic analysis of the final model. The design of experiment type was LHSD, type of samples was User-Defined Sample with 20 samples and in the the Six Sigma Analysis section, type of samples was LHS with 10000 samples were selected. In the probabilistic analysis, the compressive strength of concrete (fc) was analyzed as a variable value with normal distribution selected and the sensitivity and effect of the responses were investigated.

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