Axial Capacity Model for Shear-Damaged Columns

Most tests of reinforced concrete (RC) columns under seismic load conditions have been terminated shortly after loss of lateral load capacity. However, if a column can reliably carry gravity load after its lateral strength degradation begins, it may be possible to achieve considerable savings by considering the column as a secondary component. This article introduces a model to estimate the axial capacity of a column that has previously experienced shear failure. The axial load on a shear-damaged column is assumed to be supported by a combination of compression of the longitudinal reinforcement and force transfer through shear-friction on an idealized shear-failure plane. The authors relate the effective coefficient of friction from the classical shear-friction equation to the drift ratio at axial failure using the results from 12 full-scale pseudostatic column tests. Approximately half of the columns used to develop the model experienced axial failure at drifts less than those predicted by the model. The authors conclude that the model provides relations among axial load, transverse reinforcement, and the interstory drift at axial load collapse.

  • Availability:
  • Authors:
    • Elwood, Kenneth J
    • Moehle, Jack P
  • Publication Date: 2005-7


  • English

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  • Accession Number: 01003002
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 1 2005 11:39AM