Numerical modeling of the behavior of overlaid slab panels for reinforced concrete bridge decks

This paper presents the results of a comprehensive numerical investigation to assess the effect of some base parameters that govern the performance of overlaid slab panels for rehabilitated bridge decks under monotonic loading. A finite-element study was carried out to investigate the behavior of overlaid reinforced concrete panels and the evaluation of contact between the substrate and the repaired layers. The performance of different configurations of overlaid slabs was evaluated in terms of ultimate load capacity, debonding load, type, amount, and extension of debonding at the interface between the existing and the repaired layers. Based on the results of the investigation, it was found that the type of surface preparation, the mechanical properties of the repaired concrete (compressive and tensile strength), the location and the thickness of the repaired layer have an important influence on the performance of overlaid slab panels under monotonic loading. The results of this study can also be used as a basis for evaluating the performance of overlaid slabs under cyclic loading.