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Different causes may lead to the non-compliance of a particular requirement related with an existing infrastructure. Often, they may be traced back to deviations from expected actions or resistances. The quantification of parameters related with such influences may provide evidence about the degree of compliance of a given structure with a particular serviceability or safety requirement. Such parameters may therefore be called indicators and associated threshold values can be established on a risk basis, as well as admissible average frequencies for outcrossing. Indicators can be monitored comparing the measured values continuously to the previously established threshold values. Alarm systems may be installed which are activated in case of outcrossing. Safety measures can therefore be adopted depending on the consequences of the observed non-compliance. Based on such an approach and by using modern information technology, inspections of large infrastructures may be automated and optimised. A series of indicators for use in road bridge inspection are proposed hereunder, together with their respective threshold values and allowable mean frequency of outcrossing. The paper also includes a practical application in which these criteria are applied to a road bridge with an unknown reliability level.

Indicators for the performance assessment of road bridges through monitoring