Modelling SFRC with a Stress-Strain Approach

Steel Fiber Reinforced Concrete (SFRC) is a tension softening material. This means that once a single crack has been formed the residual post-cracking tensile strength in that section is lower than the initial tensile strength. When increasing the deformation, the crack will open and the post-cracking tensile stress, carried by the crack-bridging fibers, will decrease. For this type of material a stress-crack width relation can easily describe the basic constitutive material behavior. However, since most design engineers are more confident with a stress-strain relation, it is investigated whether a stress-strain relation is able to accurately predict the structural behavior of SFRC. In this paper a proposal is made to derive a stress-strain relation from the results of a RILEM 3-point bending test. The proposal is based on the assumption that the influence of the crack stretches in both directions over a length equal to the height of the tensile zone. The length of this influence zone is called characteristic length. Dividing the crack width by the characteristic length results in a “virtual” tensile strain. The newly proposed stress-strain relation is used to predict the load-deflection behavior of 28 full-scale beams. The results indicate a good prediction of the structural behavior.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 103-112
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010832
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 11:35AM