Constitutive Model for the Stress-Strain Response of Fibre Reinforced Concrete in Compression

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Chapter Summary

Using an extensive database of test results a constitutive model of the compressive stress-strain response of fibre-reinforced concrete is developed. The experimental databank includes test specimens with a variety of fibre type and volumetric content. The model relates mechanical resistance at any level of axial deformation to damage buildup. Expansion in the microstructure due to crack initiation and propagation is used in the model as a measure of damage. Initiation of a post-peak descending branch in the stressstrain response is associated with the occurrence of instability in the specimen structure; in this modelling framework, fibres provide kinematic restraint to dilation in a manner analogous to conventional passive confinement. The role of fibres is evaluated through indices of mechanical behaviour such as the deformation capacity of the material, whereas the model is expressed mathematically through the mechanical properties of the fibres, the volumetric fraction of fibres and the intrinsic properties of the mortar/concrete matrix.

  • Abstract

  • Introduction

  • Behaviour of Plain Concrete Under Compression

  • Physical Model of Fibre Reinforced Concrete

  • Constitutive Model of Fibre-Reinforced Concrete Under Compressive Stress

  • Comparison with the Experimental Evidence

  • Conclusions

  • References

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