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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 54 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

The monitoring of a new structure should only be decided, after the following points have been met:

  • 1.

    A simulation or an assessment has been carried out, identifying the presumed critical or optimal positions to monitor. This should preferably include a model, to which the monitoring results can be compared.

  • 2.

    The points 3 to 7 in the list above have been met.

The “special” cases – where monitoring is commonly used Monitoring is often used in the more special cases, where:

  • 1.

    Normal inspection is difficult or impossible due to poor accessibility.

  • 2.

    New or existing large structures, where deterioration may proceed unnoticed until a severe situation has been reached and excessive costs are required for the maintenance or repair.

3. Severe deterioration, where the degree of damage and the uncertainties in the damage growth forces the end-user to take action in order to ensure the safety. One action is to carry out monitoring, to get an improved logging of the dam- age growth and postpone the repair or replacement of the structure, until it is

actually

required.

Another action is to incorporate surveillance monitoring of the structure per- formance, where the system can send alarm messages to the end-user when certain critical levels have been reached (e.g. deflections, crack widths, vibra- tions exceeding the allowed level).

The interfacing criteria is the same in these cases as in “normal” cases, but the eco- nomic and the safety aspects will usually lead the end-user to accept a monitoring strategy.

www.samco.org

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