Novelty detection through the analysis of the vibratory response
This research topic deals with the detection, localization and monitoring, through some dynamic analysis, of the degradation of civil engineering structures. Indeed, one common technique to characterize the health of a structure is its behavior under dynamic loadings, and then the monitoring of its dynamical properties, under service, due to traffic loads for example or to some external loads as wind.
The difficulty to make a diagnosis is to separate the effects due to some degradation and those induced by the environmental conditions, temperature, sunlight, hygrometry…and the type of loads that may also change the vibratory response.
The nature of civil engineering structures, with different and heterogenous types of materials makes the data processing a difficult task. Indeed, the reinforcement, the prestressing cables, and the concrete may all have some various pathologies leading to more or less significant disorders with a different impact on the remaining lifetime of the structure.
In particular, the research activities aim at determining ageing indicators based on dynamic monitoring in addition to displacement or strain measurements under operation. The merging of measures provides additional and quantified information (compared to visual inspections) that can be monitored with time.
Two PhD just started on this topic in partnership with two industrial partners experts in this field: Freyssinet-Sixense and Osmos. The first one (Raphaël Carpine) deals with the novelty detection of defects in reinforced concrete structures by vibratory response and the second one (Adji Diotemba) deals with indicators for characerizing ageing of reinforced concrete structures by a statistical analysis of measures.
Contacts : pierre.argoul@univ-eiffel.fr ; claude.rospars@univ-eiffel.fr
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