Capacité résiduelle portante d'une poutre en béton précontraint

While performing work maintenance in Charleroi, the SPW (Service Public de Wallonie) decided to dismantle a 16 meters long pre-stressed beam, extracted from a bridge (external beam). Indeed, this beam was severely attacked by corrosion and other mechanisms of degradation. Since no method does exist in order to evaluate the resistance of a beam subjected to degradation, there was no tools making a decision about the resistance possible. For obvious security reasons, the beam was dismantle. The presented thesis consists in the first step of a work looking for a simple method of inspection that would allow engineers to decide if the work is still resistant enough to resist the solicitations due to traffic. First, some non destructive method are used in order to characterize the materials making the beam and in parallel, an excel code computes a statistical analysis of the resistance. Secondly, the beam was tested to failure. In the last part of the thesis, the measurements of the test are interpreted and give some unexpected results (including 3-D phenomena). Some of those results are partially explained, some other need to be confirmed by a numerical analysis model