Monitoring and repair of an impact damaged prestressed bridge

Vikram Pakrashi, Julie Harkin, Joe Kelly, Aidan Farrell, Sreejith Nanukuttan

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)


    This paper details the monitoring and repair of an impact damaged prestressed concrete bridge. The repair was required following an impact from a low-loader carrying an excavator while passing underneath the bridge. The repair was carried out by preloading the bridge in the vicinity of the damage to relieve some prestressing. This preload was removed following the hardening and considerable strength gain of the repair material. The true behaviour of damaged prestressed concrete bridges during repair is difficult to estimate theoretically due to lack of benchmarking and inadequacy of assumed damage models. A network of strain gauges at locations of interest was thus installed during the entire period of repair. Effects of various activities were qualitatively and quantitatively observed. The interaction and rapid, model-free calibration of damaged and undamaged beams, including identification of damaged gauges were also probed. This full scale experiment is expected to be of interest and benefit to the practising engineer and the researcher alike.
    Original languageEnglish
    Pages (from-to)16-29
    Number of pages14
    JournalProceedings of the ICE - Bridge Engineering
    Issue number1
    Early online date26 Nov 2012
    Publication statusPublished - Nov 2012


    • field testing
    • performance monitoring
    • beams & girders
    • strength testing


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