A full reliability-based assessment of deterioration, in a prestressed concrete bridge subject to cable corrosion, involves the following stages: (1) a probabilistic analysis of the structural reliability of the bridge structure for increasing degrees of deterioration; (2) a stochastic analysis of the evolution of cable corrosion as a function of time; and (3) an overall time-dependent analysis of the safety of the structural system, by combining stages (1) and (2). This paper focuses on stage (1), which requires the identification of at least one critical limit state, and the application of such states to a bridge structure as built. It also considers the specific example of a three-span road bridge with central span 20.40m and side spans of 16.3m each, a solid slab cross section of constant width 9.0m, and several other specific parameter values. The bridge is designed to dead loads consisting of own weight, railing loads, and overlay loads; its live loads include lorry and lane loads. For this structure, two critical limit states are considered: the bending ULS and the prestressing wire fatigue LS; the latter uses a cumulative damage model for prestressing steel wires. A relationship is developed between the prestressed bridge reliability and the number of failed tendons due to corrosion. For the covering abstract see IRRD E104152.

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  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Publication Date: 1999


  • English

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  • Accession Number: 00788390
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2841-5
  • Files: ITRD
  • Created Date: Mar 3 2000 12:00AM