Papers by Author: Georges Magonette

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Authors: Georges Magonette
Abstract: This paper presents the latest developments realized at the European Laboratory for Structural Assessment (ELSA) of the Joint Research Centre (JRC) to extend the 'on-line testing method with substructuring' to the experimental verification of civil buildings protected by semiactive devices. Recent works have indicated that semiactive control systems can achieve significantly better results than passive control systems and demonstrate significant potential for controlling structural responses to a wide variety of dynamic loading conditions. These factors explain the considerable interest in the practical implementation of these systems for protection of civil infrastructures against earthquake and wind loading or, more generally, for vibration mitigation. Commonly, cyclic tests are initially performed to characterize the semiactive device behavior but a complete validation requires the simulation of realistic dynamic loads including the effects of the protected structure and the evaluation in real world of the performance and robustness of different control laws and related instrumentation before the final hardware implementation. Experimental verifications satisfying such requirements can be achieved by using the novel extension of the on-line testing procedure presented here.
Authors: Giovanni Damonte, Stefano Podestà, Giuseppe Riotto, Sergio Lagomarsino, Georges Magonette, Francesco Marazzi
Abstract: Monitoring represents one solution for the safeguard of historical buildings. The need for a non-destructive and comprehensive monitoring methodology suggests using related to Structural Health Monitoring. This paper is intended to present the outcomes of an experimental campaign on a masonry triumphal arch representing a real scale model of a church part, which was built outside ELSA laboratory at the Joint Research Centre of European Commission. This study aims to evaluate the damage pattern of the structure through simplified dynamic methods producing a quick evaluation of structural safety, easy to use on real cases. As in traditional monitoring, both the instrumentation precision and the measurement variability due to the different testing condition (e.g. ambient conditions) have to be considered. The related effects on the structural dynamic behaviour were analysed and evaluated in order to distinguish an effective change in the “structural health” (a real damage) from an alteration caused by external conditions (a “false positive”). Once studied such effects, settlements were induced to one column base through an “ad hoc” device. Varying the settlement width, three damage levels were obtained in the structure. For each state the structural dynamic properties and their variation were evaluated. Sensitivity of dynamic behaviour to structural damage and to its changes was analysed comparing the results for each level.
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