Reliability analysis based identification for bridge assessment

A complex interdisciplinary approach to the reliability assessment of reinforced concrete structures is introduced and demonstrated on a real existing structure. The reliability index of the structure drops down during its life cycle due to material degradation. A retrofitting to the desired reliability level should be performed. This procedure is modelled by advanced life-cycle computer simulation. The main feature of the presented approach is the nonlinear finite element analysis of the structure employed for the realistic assessment of structural behaviour. A suitable technique of statistical sampling, which allows relatively small number of simulations, is used in this context. Analytical deterioration models combined with in situ monitoring are used to launch the degradation process. The presented methodology for advanced life-cycle analysis integrated in an innovative decision-making tool that supports maintenance planning of bridges and in general of engineering structures.