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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 17 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

Their results are also used to calibrate and validate the predictive models of deterio- ration. In particular they are used to:

  • Determine the extent of damage;

  • Determine the strength of concrete, steel, etc (for instance from laboratory testing);

  • Determine the condition of concrete, depth of carbonation, chloride penetra- tion;

  • Determine corrosion of steel;

  • Determine loss/rupture of pre-stressing;

  • Determine the load-carrying capacity (on-site load testing);

A specialised field of monitoring is represented by the long-term monitoring of the structural (deformations, temperature, cracks, pre-stressing forces) and dynamic be- haviour (wind, traffic).

Measuring techniques are only one aspect of a monitoring programme, which must be tailored to the different monitoring objectives, to the bridge type and to the bridge life cycle situation. For instance in the service life of concrete bridges, a monitoring objective may be detection of corrosion.

A number of different techniques are available, from portable equipment to sensors permanently installed on the structure. For this last category of continuous monitor- ing, in particular with remote systems, their convenience depends on the type of con- struction, level of damage observed, installation costs and foreseeable conse- quences in terms of costs of maintenance and costs for data acquisition and interpre- tation.

Applications of remote systems may be envisaged for:

  • Prototype structures or structures of strategic importance;

  • Large structures;

  • Structures in particularly aggressive environment;

  • Parts of the structures difficult to access;

  • Individual structures representative of a population of similar bridges;

  • Structures where damage has been detected and monitoring is used to gather further information before repairs are carried out;

  • Testing the efficacy of repairs when this type of repair is typical for a large number of structures (i.e. surface treatment).

www.samco.org

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