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Finite Element Modelling of Damage in concrete and FRC under static and cyclic loading using Microplane Method

Shishehbor, Mehdi | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42905 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. Concrete as a heterogeneous, quasibrittle and practical material has always been a challenging material for modeling. Although numerous models have been proposed since now, many of them have some deficits. Microplane is a multiscale model which introduces some micro-planes as interaction planes between concete and aggregates. To generate concrete behavior, stress-strain relations are established on these micro-planes. In the present study, two prominent microplane models, M2 and M4, has been used in 2D and 3D Finite element framework. M2 model has been applied and developed to produce FRC behavior for uniaxial tension and compression under static and cyclic loading. To better optimize M2 model, its parameters have been related to physical characteristics of concrete. Regarding to poor cyclic modeling of M2, M4 model has been applied for this purpose. It has been shown that M4 model are able to consider energy dissipation during unloading and reloading. Then, its capability of fatigue modeling has been discussed. Due to the fact that concrete has a softening stage, the finite element analysis results are incorrectly depended on mesh, either the size of mesh or its direction, unless some proposed methods taken into account. In this study the validity of nonlocal approach has been investigated. At the end, nonlocal method has been used to capture structure size effect on results.


  9. Keywords:
  10. Size Effect ; Non-Localization ; Fatigue ; Microplane Model ; Cyclic Behaviour

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