| Zdroj: |
Structure & Infrastructure Engineering: Maintenance, Management, Life-Cycle Design & Performance; Jun2005, Vol. 1 Issue 2, p207-220, 14p, 1 Diagram, 10 Charts, 6 Graphs |
| Abstrakt: |
A performance assessment of corroded reinforced concrete (RC) structures requires an acute understanding of both material deterioration and its impact on structural behaviour, in order to evaluate its durability, safety, serviceability and remaining service life. The corrosion phenomenon is usually due to carbon dioxide and chloride ions. More generally, the environmental conditions may determine what kind of deterioration mechanism can produce structural degradation depending on relative humidity, temperature, severity of the surrounding environment, materials properties, etc. Consequently, the performance cycle prediction of reinforced concrete structures involves many factors, which introduce uncertainties. A probabilistic approach as opposed to a deterministic one is therefore more appropriate to generate reliable cycle predictions. This paper focuses on the application of the principles of such a probabilistic approach to calculate for a typical set of RC bridges in France, the critical times corresponding to every performance cycle, considering both chloride-induced corrosion and carbonation, but also concrete cracking and spalling. For this purpose, the impact of the environment on the RC structures and the principal material properties are taken into account in this analysis. A methodology is also provided for roughly assessing serviceability cycles from visual inspections. [ABSTRACT FROM AUTHOR] |
