The presented work addresses the problem of timber connection devices under seismic load condition and their dissipative behavior. The most relevant experimental works of the last decade, both in case of connection sub-assembly and at the structural level of the shear wall, have been systematically entered in a database. Large scatter in the ductility values at both structural levels is recognized. Mode of failure characterizing the connection could be different than pure plastic development jeopardizing completely the design method based on over-strength or dissipative assessment or both. Within this context, a case study addressing the seismic assessment of a shear wall is developed. Numerical models using lumped plasticity method, as well as analytical model are adopted, being validated against experimental results documented in the literature. The main goals are: (i) highlight the role of the different parameters contributing to the load-displacement behavior of a shear wall connected to the concrete foundation via metal devices; (ii) pave the way for a displacement based approach.
Il presente lavoro affronta il problema dei dispositivi di connessione per strutture in legno soggetti all’azione sismica, e il comportamento dissipativo di questi ultimi. Le ricerche sperimentali più significative degli ultimi decenni, condotte sulle connessioni e sui muri a taglio, sono state raccolte in uno Stato dell’Arte. Per entrambi i livelli strutturali, è stata rilevata una vasta dispersione nei valori di duttilità. Il meccanismo di rottura che contrassegna le connessioni potrebbe essere diverso da una pura deformazione plastica, compremettendo completamente i metodi progettuali basati o sulla capacità, o sulla dissipazione, o su entrambe. In questo contesto, è stato approfondito un caso di studio riguardante la valutazione sismica di una parete a taglio e, sono stati sviluppati modelli numerici ed analitici, validati attraverso i risultati sperimentali documentati nella letteratura. Gli obbiettivi principali sono: (i) mettere in evidenza il ruolo di diversi parametri che influiscono sulla curva forza-spostamento di una parete a taglio connessa ad una fondazione in calcestruzzo attraverso dispositivi metallici; (ii) tentare un approccio, che anche in campo non lineare, risolva la congruenza di spostamenti.
Timber connection devices under seismic load. State of the art and case study
Cruz, Adrian
2019/2020
Abstract
The presented work addresses the problem of timber connection devices under seismic load condition and their dissipative behavior. The most relevant experimental works of the last decade, both in case of connection sub-assembly and at the structural level of the shear wall, have been systematically entered in a database. Large scatter in the ductility values at both structural levels is recognized. Mode of failure characterizing the connection could be different than pure plastic development jeopardizing completely the design method based on over-strength or dissipative assessment or both. Within this context, a case study addressing the seismic assessment of a shear wall is developed. Numerical models using lumped plasticity method, as well as analytical model are adopted, being validated against experimental results documented in the literature. The main goals are: (i) highlight the role of the different parameters contributing to the load-displacement behavior of a shear wall connected to the concrete foundation via metal devices; (ii) pave the way for a displacement based approach.File | Dimensione | Formato | |
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Timber Connection Devices under Seismic Loads - State of the Art and Case Study.pdf
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Descrizione: Master Thesis
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https://hdl.handle.net/10589/164262