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Comparative Study on Stability of Concrete Gravity Dams Using Rigid and Flexible Approach

jalili Sadr Abad, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44564 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghaemian, Mohsen
  7. Abstract:
  8. One of most important type of dams are concrete gravity dams, This structures maintain their stability against the load from their weight. The study of stability of dams is very important issue because Iran is placed on a seismic zone and instability of constructed dams will cause many problems for us. There are two method in study of concrete gravity dams: in first method which is named rigid approach the body of dam consider as a rigid body and by equilibrium equations and traditional strength of material concepts the safety factors of stability and stresses are determined. In second method that is named flexible approach, we should prepare a finite element method from the dam, reservoir and foundation. in this research at the first we choose four height dams and some value for cohesion and friction angels and obtain the safety factors of stability and the stresses for two case of with drains and without them and for widespread range of PGAs using CADAM software. Then, we study the sliding of dam and calculate the stresses on the foundation the by using ABAQUS software. Thereafter we compare this two methods, it is concluded that in most cases overturning occur after the sliding, and stresses on foundation are under the bearing capacity in most condition. Based on our investigation it is observed that rigid approach in respect of flexible approach is more conservative, thus in many case that rigid approach indicate the instability the flexible method do not this, also the stress on rigid approach are bigger than the stress in flexible approach. The high effect of drain also is observed in this research
  9. Keywords:
  10. Stability ; Concrete Gravity Dam ; Rigid Approach ; Flexible Approach

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