| Fiber reinforced concrete is used as the material of a kind of multiphase. Its properties have been studied deeply in the recent years. Its mechanical properties and damage rule are determined not only by the component performance, but also by its mesomechanic structural characteristics.Therefore,it is a new trend in fiber reinforced composite to establish an inherent relationship between the macroscopic mechanical properties and the component properties by mesomechanics. Stress transfer between the fiber and the matrix in the fiber reinforced composite has been analyzed extensively using a shear lag model. When the ends of the fiber are bonded to the matrix, the stress at bonded ends is finite. However, boundary condition can't appear at bonded ends, and it brings troubles to the confirmation of the stress.In order to determine stress at bonded ends, a technique of adding imaginary fibers in the improved shear lag model is developed to resolve boundary condition at the fiber ends.Consequently, the distribution of stress at bonded ends can be determined. The main work of this . thesis is to establish reasonable mechanical analysis model under the function of pull and pressure, to implement theoretical derivation and analysis of stress transfer mechanism of fiber reinforced concrete in the level of mesomechanics,to give the distribution of interface shear and stress between the fiber and the matrix, to discuss fiber on the effects of strengthening and crack arresting of concrete; It is to implement the theories verification and discuss with analysis for the model of stress transfer in virtue of the software of Matlab6.5 on the basis of known experiment data. The analysis consequently indicates the validity and justification of established model, and shows the continuity of stress transfer at the fiber ends, have an obvious action of stress transfer at fiber ends. The present paper can provide useful references on the design of fiber reinforced concrete composites.
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