This thesis investigates the effectiveness of Active Mass Damper (AMD) type active control systems with Sky-Hook control law for seismic risk mitigation in structures. The different structural control technologies are presented and compared in order to highlight the merits and shortcomings of each one. Two finite element models are presented, on which detailed studies of the behaviour of uncontrolled structures (i.e. without active devices) have been carried out through linear and non-linear, static and dynamic analyses, as required by the NTC-18 regulations and Application Circular. Among the analyses performed, there is also an emphasis on non-linear dynamic analyses to carry out a detailed evaluation of the effects of various seismic events on the two different models, both with and without the application of an AMD system. By varying the seismic input, the number of AMD machines applied and the gain, the responses of the structures were studied in order to minimise the effects of the earthquake. Finally, comparisons were made between the uncontrolled structure and the controlled structure (equipped with the AMD system) in terms of forces, damage and displacements, taking into account the limitations of the active technology.
Questa tesi investiga l'efficacia dei sistemi di controllo attivo di tipo Active Mass Damper (AMD) con legge di controllo di tipo Sky-Hook per la mitigazione del rischio sismico nelle strutture. Sono esposte le diverse tecnologie di controllo strutturale e messe a confronto, al fine di evidenziarne pregi e difetti per ciascuna di queste. Sono presentati due modelli ad elementi finiti su cui sono stati svolti studi dettagliati del comportamento delle strutture non controllate (ovvero sprovviste di dispositivi attivi) attraverso analisi lineari e non lineari, statiche e dinamiche, come previsto da normativa NTC-18 e Circolare Applicativa. Tra le analisi svolte è poi accentuata l'attenzione sulle analisi di tipo dinamico non lineare per svolgere una valutazione dettagliata degli effetti di vari eventi sismici sui due differenti modelli, sia con che senza l'applicazione di un sistema di AMD. Al variare dell’input sismico, del numero di macchinari AMD applicati e del Gain sono state studiate le risposte delle strutture al fine di minimizzare gli effetti del sisma. Infine, sono state condotte comparazioni tra la struttura non controllata e la struttura controllata (equipaggiata con il sistema di AMD) in termini di forze, danneggiamenti e spostamenti, tenendo in considerazione dei limiti legati alla tecnologia attiva.
L'utilizzo di sistemi Active Mass Damper (AMD) per il miglioramento della risposta sismica di strutture in cemento armato
ZULIAN, BARBARA
2023/2024
Abstract
This thesis investigates the effectiveness of Active Mass Damper (AMD) type active control systems with Sky-Hook control law for seismic risk mitigation in structures. The different structural control technologies are presented and compared in order to highlight the merits and shortcomings of each one. Two finite element models are presented, on which detailed studies of the behaviour of uncontrolled structures (i.e. without active devices) have been carried out through linear and non-linear, static and dynamic analyses, as required by the NTC-18 regulations and Application Circular. Among the analyses performed, there is also an emphasis on non-linear dynamic analyses to carry out a detailed evaluation of the effects of various seismic events on the two different models, both with and without the application of an AMD system. By varying the seismic input, the number of AMD machines applied and the gain, the responses of the structures were studied in order to minimise the effects of the earthquake. Finally, comparisons were made between the uncontrolled structure and the controlled structure (equipped with the AMD system) in terms of forces, damage and displacements, taking into account the limitations of the active technology.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/64897