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BTC method for evaluation of remaining strength and service life of bridge cables.
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  • Abstract:
    "This report presents the BTC method; a comprehensive state-of-the-art methodology for evaluation of remaining

    strength and residual life of bridge cables. The BTC method is a probability-based, proprietary, patented, and peerreviewed

    methodology, which applies to parallel and helical; either zinc-coated or bright wire of suspension and cablestayed

    bridge cables. The BTC method includes random sampling without regard to wire appearance, mechanical

    testing of wires, determining the probability of broken and cracked wires, evaluating ultimate strength of cracked wires

    employing fracture mechanics principles and utilizing the above data to assess remaining strength in each investigated

    length of the cable. The probabilistic-based BTC method forecasts remaining service life of the cable by determining

    the rate of growth in broken and cracked wires proportions detected over a time frame, measuring the rate of change of

    fracture toughness over same time frame, and applying the rates of change to a strength degradation prediction model.

    The BTC method provides sensitivity analysis to identify the key inputs, which influence the estimated cable strength

    and assist decision-making process. The report describes the application of BTC method at Mid-Hudson Bridge in

    Highland, New York, conducted by Bridge Technology Consulting (BTC), under a joint contract with New York State

    Department of Transportation (NYSDOT) and New York State Bridge Authority (NYSBA). This project is funded in

    part with funds from the Federal Highway Administration (FHWA). The BTC method has been peer-reviewed by

    MTA Bridges & Tunnels, NYSDOT and NYSBA. To date, the BTC method has been applied to evaluate cable

    strength at the Bronx-Whitestone Bridge and Mid-Hudson Bridge, in the state of New York, USA."

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