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Dynamic Simulation of Crack Propagation in Concrete Using Lattice Model

Pourmatin, Mohammad Hossein | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40130 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khoei, Amir Reza
  7. Abstract:
  8. Lattice modeling is one of the most effective methods of simulation of crack initiation and propagation in heterogeneous materials. In this method, not only the impurities can be modeled in detail, but also micro crack initiations and crack ramifications can be observed. Lattice model simulations have shown remarkable results in both force-displacement charts and visual crack formations in heterogeneous materials, especially concrete. Simulation of mechanical behavior of concrete has always been a controversial issue in lattice modeling; and, so far, many researchers have proposed different methods. However, high computation demands, has preserved researchers from any major work on the dynamic behavior of inhomogeneous materials with this model; while, naturally, crack propagation is a dynamic phenomenon. Therefore, the static analysis of crack propagation has some inherent errors. In this project, we have proposed a dynamic analysis of crack propagation in concrete using lattice model. The Timoshenko beam theory is applied instead of the classical Euler-Bernoulli beam theory and the mechanical properties of lattice beam are derived based on the corresponding continuum medium using the non-local continuum theory. Additionally, the average acceleration method is applied for dynamic modeling of crack propagation in concrete. Finally, four experimental tests, including the simple tension experiment, the Nooru-Mohamed test and three point bending test, are simulated using the proposed model in order to investigate the effects of dynamic crack propagation and the results are compared with those of static analysis. The results show a remarkable agreement between the experimental force-displacement curves and those obtained from static and dynamic simulations. As a result, dynamic effects have great impacts on the softening part of the process; however the appearance of the cracks formation does not show any significant changes.
  9. Keywords:
  10. Fracture Mechanics ; Dynamic Analysis ; Microcrack ; Force-Displacement Diagram ; Crack Propagation Path ; Mixed-Mode Fracture

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