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Crack Propagation Modeling in Arched Concrete Structures Reinforced by FRP Using XFEM and Damage Model

Mohammadi, Amir Hossein | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50611 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khoei, Amir Reza
  7. Abstract:
  8. In practice, structures made of concrete are full of cracks. The strength of concrete is mainly determined by the tensile strength, which is about 10% of the compressive strength. As long as cracking in concrete is unavoidable, we have to try to minimize their detrimental effects. This objective can be achieved by resisting (or limiting) propagation of existing cracks. Because of this, reinforcement (mostly steel) is used to increase the carrying capacity of the material and to control the development of cracks. Concrete structures that fail, already shows a large number of large and small cracks before their maximum carrying capacity is reached. The failure of concrete can be characterized by the nucleation and propagation of the cracks until final collapse. The cohesive model is employed to describe the nonlinear fracture processes developing in the area in front of the crack tip called the fracture process zone (FPZ) where the energy dissipation takes place. The reliable numerical simulation of concrete is important for the planning of new structures, as well as for the safety assessment of existing structures. It allows for parametric studies on the influence of different factors, such as material properties, and reduces the total number of experimental verifications. In this study, the combination of Concrete Damaged Plasticity with X-FEM technique is used to investigate the behavior of RC Arches structures strengthened with FRP strips with the cohesive crack model by introducing the enriched DOF to the nodes associated with the discontinuity. A model developed that can model RC Arches for capture of initiation and growth of cracks. The initiation and propagation of cracks in several numbers of experimental models are verified with X-FEM numerical simulation. The influence of sum parameters such as shape geometrical of Arch, intrados FRP strips and their de-bonding are studied
  9. Keywords:
  10. Cohesive Crack ; Crack Initiation ; Concrete Damage Plasticity ; Extended Finite Element Method ; Fracture Process Zone ; Reinforced Concrete Structures

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