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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 41949 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Kazemi, Mohammad Taghi
- Abstract:
- In concrete which is a quasi-brittle material failure initially occurs between aggregate and mortars. Fibers of all orientations, randomly embedded in FRC, serve to restrict and delay the coalescence of micro-cracks, micro-voids and micro-slips into wide continuous cracks. While the fibers increase the uniaxial tensile and compressive strength only moderately, they are very effective for enhancing the ductility and energy absorption capability. This elevates structure resistance to impact, ground-shock and blast. One of the most successful efforts toward reaching a macroscopic model which can take micromechanical properties into account is the Microplane model. In this microscopic non-tonsorial model, the micromechanics of deformation is described by some suitably simplified models and the constitutive material properties are described by a relation between the stress and strain components on the micro -level.In the present study, by modifying Microplane model M2 and its parameters, we were able to simulate concretes behavior in far post-peak. Moreover, by considering FRC behavior a material model for fibers in interaction with concrete has been presented. A new model called M2f has been introduced. The model M2f has been implemented in a finite element code. A simple non-local concept has been used to solve model's mesh sensitivity problem. In the end, FRC's behavior has been simulated using model M2f. The models results under uniaxial and biaxial, tension and compression have been verified with both, experimental data and microplane model M5f. In addition, a simple two dimensional beam has been analyzed by the finite element code
- Keywords:
- Microplane Model ; Fiber Reinforced Concrete ; Strain-Softening Behavior ; M2F Model ; Non-Localization
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