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Nonlinear Dynamic Analysis of Lean RCC Dams

Bagheri, Yaser | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42543 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghaemian, Mohsen
  7. Abstract:
  8. In recent years, the construction technique in dam engineering has been revolutionized due to the rapid development of roller compacted concrete (RCC) and By making the continuous construction of dam without contraction joints, the goal of more economical and faster concrete dam construction has been realized. The typical stress-strain behavior of traditional concrete and high cementations content RCC results in a reasonably constant modulus of elasticity that is valid for stresses ranging from zero to near ultimate strength. But lean RCC mixes typically have nonlinear stress strain behavior with hardening after stresses exceed about 25% of the ultimate strength. Using the nonlinear stress-strain properties, instead of assuming an incorrect but more traditional constant linear modulus of elasticity, provides a true picture of actual stresses in the analysis of dams constructed with low cementations content RCC. When low cementations content RCC is used for dam construction following results will drive: 1. With regard to hardening properties of lean RCC, the Cracking in the dam body has been completely decreased. 2. Redistribution of loads from high stress areas (such as the upstream and downstream faces and heel of a dam) to lower areas of stress (such as the interior of the dam). 3. Peak stresses are decreased. To evaluate safety of RCC dams during earthquake, nonlinear seismic analysis of dams has been too importance. With regard to the fact, more nonlinear analysis for RCC dams with high cementations content has been. But in this research the nonlinear analysis of lean RCC dams is the object. For this the numerical model has been proposed and the computer program NSAG-DRI has been used
  9. Keywords:
  10. Hardening ; Nonlinear Seismic Analysis ; Roller-Compacted Concrete Dam ; Lean Roller Compacted Concrete ; Nonlinear Stress-Strain Behavior

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