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Damping Effects on Nonlinear Seismic Analysis of Concrete Gravity Dams

Ahmadi, Hadi | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45130 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghaemian, Mohsen
  7. Abstract:
  8. Supplying water has almost always been the essential need of human for agricultural, industrial and drinking water use. One of the infrastructure works to catch up to this goal is dam construction. Among all of dams, concrete gravity dams have been fortunate between designers and builders of dams, because of their acceptable function against seismic loads. So, analyzing the function and stability of dams is important in different cases. Formed crack in dam body is one of the most important parameters that affect both the function and durability of a concrete gravity dam and considering the measure of the earthquake affects on the formation and expansion of crack profiles many studies have been devoted to crack analysis. Moreover, in concrete gravity dams once a crack is formed concrete enters into non-linear phase and hence the assumption of linear behavior is inappropriate to analysis the seismic response of dams. On the othe hand, nonlinear system are sensitive to initial conditions. It means that an infinitesimal change in the initial conditions can result in large changes in the final response and the responses will be unpredictable. Modeling the damping parameters is one of the most effectual characteristics in concrete dams analysis. Since in engineering studies the viscous damping mechanism because of its feasibility, has been used to solve the equations of motion, this investigation deals with the effects of different damping types on the result of nonlinear analysis of concrete gravity dams and expansion of crack profiles. Considering the results we tried to introduce the appropriate model of damping in analyzing the concrete gravity dams. After accomplishment nonlinear analysis on three concrete gravity dams with various heights, it is concluded that, mass matrix coefficient in damping matrix causes wrong results in analysis of nonlinear systems. However, the state will not happen for stiffness matrix coefficient and must use of a state that mass matrix coefficient have not high value for constructed damping matrix
  9. Keywords:
  10. Concrete Gravity Dam ; Crack Profile ; Nonlinear Dynamic Analysis ; Damping Factor

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