High-Cycle Fatigue of Diagonally Cracked RC Bridge Girders: Laboratory Tests

Large numbers of conventionally reinforced concrete (RC) deck–girder bridges are in the national highway system. Diagonal cracks have been identified in many of these bridges, which are exposed to millions of load cycles during service life. The anticipated life of these bridges in the cracked condition under repeated service loads is uncertain. Laboratory experiments were performed on full-size girder specimens to evaluate possible deterioration in shear capacity under repeated loading. Specimen variables included: T and inverted-T configurations, stirrup spacing, and flexural reinforcing details. Test results indicated bond deterioration increased diagonal crack displacements, and analysis methods to predict the shear capacity of diagonally cracked reinforced concrete girders subjected to high-cycle fatigue damage are provided. The American Association of State Highway and Transportation Officials (AASHTO)-Load Resistance Factor Design (LRFD) shear provisions conservatively predicted shear capacity for the fatigued specimens without stirrup fractures, and shear capacity predictions from computer analysis program Response 2000 were very well correlated with experimental results for fatigued test specimens when the input concrete tensile strength was reduced to nearly zero.

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  • Authors:
    • Higgins, Christopher
    • Lee, Ae-Young
    • Potisuk, Tanarat
    • Forrest, Richard W B
  • Publication Date: 2007-3


  • English

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  • Accession Number: 01049451
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 28 2007 8:37PM