GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 2.2 251 performance of glass components was represented by steel-to-glass connection detail as in Fig. 2(d), which resulted in a rather stiff connection not able to facilitate any kind of local displacement, or even to prevent localized stress peaks in glass components. Overall, the study proved that existing / historic glass envelopes are highly vulnerable to seismic actions and – even in the formof secondary building components – should be somehow preserved against large displacement or stress demands from the primary buildings. In such a kind of consideration, the use of in-field OMA techniques to integrate the lack of technical specifications and drawings for the selected glass envelope (built up in 1961) provided great effort in the structural analysis of the state-of-art conditions and actual mechanical capacity of the façade. On one side, the investigation confirmed that existing glass envelopes and components are critical elements for safety of building customers, since not able to respond to actual design performance demands. At the same time, the investigation suggested that there is urgent need of harmonized methodological procedures and standardized evaluation framework that could be used for the vulnerability and risk analysis of historic heritage and for (when possible) retrofit proposals for existing glass components. As far as a general procedure inclusive of guideline rules and recommendations in support of the vulnerability analysis of existing / historic glass envelopes is currently missing (for in-field non-destructive assessment and numerical analysis), future studies will be spent for the proposition of damage indexes or methodologies in support of designers. Acknowledgements. Dr. Maria Vittoria Santi (University of Udine) is gratefully acknowledged for technical support during the in-field experimental investigations. The Municipality of Torviscosa (UD) is also acknowledged for facilitating the experimental measurements. References Bedon C., Amadio C. and Noé S.; 2019: Safety Issues in the Seismic Design of Secondary Frameless Glass Structures . Safety, 5(4), 80. CNR-DT 210/2013. Istruzioni per la progettazione, l’esecuzione ed il controllo di costruzioni con elementi strutturali di vetro . CNR, Roma, Italy. Santi M.V., Lazzara M. and Frangipane A.; 2022: Il Centro Informazione e Documentazione di Torviscosa, da architettura aziendale a spazio culturale, 1961 - 2021 . Proceedings of Colloqui.AT.e 2022 - Convegno Artec, 7-10 settembre, Genova, Italy.