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Numerical Simulation of Large Deformations in Impact to Composite Concrete-Steel Structures Using Coupled Damage-plasticity Model

Eslahi, Reza | 2019

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52003 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Concrete has long been considered by engineers as one of the most used constructional materials. Therefore, recognition of mechanical behavior of concrete materials is of particular importance. So, extensive studies have been undertaken to understand and analyze its behavior under different loading conditions. Based on these studies, many models for describing the behavior of concrete are presented. Of these, many models are based on the combination of plastic theory and damage mechanics, and by using them, significant success has been achieved in the correct modeling of concrete materials. On the other hand, one of the important loading conditions encountered by concrete structures is in high speed collision. Therefore, recognizing the response of concrete materials to high-velocity impact and assessing the quality of the models presented in the reproduction of these responses is of particular importance. While concrete structures with special conditions, like presence of high confining pressure or combining with other structural members like stiffener plates or reinforcement bars, can exhibit large deformations under high velocity impacts. Therefore, it is necessary to extend concrete material models to large deformations. Accordingly, in this study, a coupled damage-plasticity model which is properly capable in modeling the concrete behavior in small deformations is selected and together with some modifications is extended to the range of large deformations. As a result, a general framework and algorithm for modeling concrete structures under large deformation is provided.Numerical solution of this algorithm is difficult in complex dynamic problems, such as high-velocity impacts, and is not easily feasible. In this research, based on the numerical study of the proposed model for concrete modeling in large deformation, a stable and optimal computational algorithm is presented for numerical simulation of concrete structures. Using this algorithm, the dynamic and complex problem of high-velocity impact to concrete structures is simulated with reasonable computational cost. Several numerical examples have been proposed and evaluated in order to assess the accuracy and efficiency of the proposed framework
  9. Keywords:
  10. Finite Element Method ; Concrete Behavior ; Plasticity ; Damage Mechanism ; Dynamic Contact-Impact Problem ; Contact Problem ; Large Deformation

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