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Structural assessment and reliability analysis for existing engineering structures, applications for real structures

A complex interdisciplinary approach to the reliability assessment of reinforced concrete structures is introduced and demonstrated on a real existing bridge structure. The reliability index of the structure decreases 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 statistical sampling technique, which allows relatively small numbers of simulations, is used in this context. Different degradation scenarios are analysed concerning their effect on the structure's reliability progression. These studies give a basis for future models including analytical deterioration models combined with in situ monitoring, used to launch the degradation process. Finally the presented methodology for advanced life-cycle analysis is integrated in the innovative decision-making tool that supports the maintenance planning of engineering structures.