A simplified constitutive model is presented that recognizes and incorporates the properties of microstructure and its influence on mechanical response of plain concrete. The model evaluates uniaxial compressive stress at any level of axial strain, using a strain-dependent estimate of material stiffness. The initial elastic modulus of uncracked concrete is assessed, based on water-cement ratio, age, volume fraction of aggregates, paste porosity, degree of hydration, and paste-aggregate interface properties. Reduction of the initial modulus with increasing load is modeled by the application of a factor that depends on the natural porosity of the material and mechanically induced porosity as it is assessed by the area strain that develops in the cross section supporting the load. Using this approach, it is possible to model the change effected on the initial resistance of the material from progressive microcrack growth and internal damage occurring in the concrete. The sensitivity of the proposed model to several variables was evaluated from parametric studies and by comparisons with available experimental data.

  • Availability:
  • Corporate Authors:

    American Concrete Institute

    P.O. Box 19150, Redford Station, 22400 Seven Mile Road
    Detroit, MI  United States  48219
  • Authors:
    • Pantazopoulou, S J
    • Mills, R H
  • Publication Date: 1995-11


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00716471
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 18 1996 12:00AM