Effective Stiffness of Reinforced Concrete Columns

This study uses the experimental response of 329 concrete columns to assess existing and proposed models of the effective stiffness of reinforced concrete columns subjected to lateral loads. Existing models appropriate for design applications are shown to overestimate the measured effective stiffness and are unacceptably inaccurate, because they generally neglect the influence of anchorage slip on the effective stiffness of the column. Based on simplifications of a three-component model, a new procedure is proposed that explicitly accounts for deformations due to flexure, shear, and anchorage-slip. The new procedure is shown to provide a more accurate estimate of the measured effective stiffness for the database columns. For this model, the ratio of the measured stiffness to the calculated stiffness had a mean and coefficient of variation of 1.02 and 22% for circular columns and 0.95 and 25% for rectangular columns. The proposed procedure is more accurate and rational than existing models, and could easily be incorporated into design provisions for concrete structures.

  • Availability:
  • Authors:
    • Elwood, Kenneth J
    • Eberhard, Marc O
  • Publication Date: 2009-7


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01140942
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 11 2009 8:39PM