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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 18 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

4

BRIDGE MANAGEMENT IN EUROPE

4.1 State-of-the-Art

Bridge management involves in all countries and for all owners or operators a num-

ber of actions, as e.g. described in the BRIME-project

/BRIME, 1999/,/Brime, 2001/. Bridge

management will, however, always consist of the following main steps:

  • 1.

    Assessment of the bridge;

  • 2.

    Prediction of damage growth;

  • 3.

    Net Present Value estimation of the different alternatives;

  • 4.

    Deciding the maintenance of the individual bridges.

The assessment of the structures condition is based on one or several inspections, carried out over a long or short period. These inspections can be visual or involve use of NDT-equipment, sampling and testing. The terms used for the inspections as well as the frequencies varies from one country and/or bridge owner to another as described in the later clauses.

The result of the assessment is normally expressed as a value for the condition of the bridge as a whole or as a value for each of the structural components. This value is often a sum of a rating of the structural parts condition (e.g. 0=perfect, 3=totally damaged), the growth rate (e.g. 0=no growth, 1= extreme growth) and the damages influence of other components. The system for rating the structural part and the bridge varies also from one country and/or bridge owner to another as described in the later clauses.

The ratings from the assessment are always stored in a BMS (Bridge Management System), which in some cases also allow the user to store other information as e.g. inspection reports, drawings, illustrations, expected repair costs etc. The BMS used varies often from one country or owner to another, just as an owner or country may be using several different BMS.

The prediction of the damage growth is usually carried out in one of the following two manners:

1. The growth towards initiation of damage (usually corrosion) and the growth of the later damage are estimated, based on semi-empirical formulas, which es- sentially extrapolates the observations from NDT-mapping or sampling of the chloride content. This prediction is carried out on each bridge and structural part individually and will usually focus on the expected changes over a period of 5, 10 or 20-25 years.

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