This paper describes theoretical and experimental studies related to seismic evaluation and retrofit of bridge column footings. One "as-built" model column footing and three retrofit model column footings were tested under simulated seismic actions. Test results of the "as-built" footing showed that column/footing joint shear failure is a potential danger to existing bridge structures. Test results also revealed that if there is no dependable tensile capacity in the pile/footing connection, a rocking behavior may dominate pier response, minimizing damage to footing and column. Model column footings retrofit using current retrofit standards developed relatively stable hysteretic responses up to moderate ductility levels. However, experimental observations and theoretical analyses based on a strut-and-tie model and yield-line theory indicated that with current footing retrofit design, which lacks the consideration for joint shear design, the reinforced concrete overlay may not develop a fully effective postcracking mechanism. Improved retrofit details including long dowels to ensure development of an effective joint shear-resisting mechanism are proposed and confirmed by experimental results.

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  • Corporate Authors:

    American Concrete Institute

    P.O. Box 19150, Redford Station, 22400 Seven Mile Road
    Detroit, MI  United States  48219
  • Authors:
    • Xiao, Y
    • Priestley, MJN
    • Seible, F
  • Publication Date: 1996-1


  • English

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Filing Info

  • Accession Number: 00719314
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 24 1996 12:00AM