GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 structural elements (represented in simplified manned by the vibration frequencies of floors); ii) the mechanical properties of timber material; iii) the trend of physical parameters (i.e., the average moisture content of walls). At the end of this stage, which is approaching its preliminary stages with in-field investigations, some relevant experimental values will be obtained. In the second / parallel stage, all the timber structures having the same features as for the reference buildings will be analyzed with very simple tools such as Bluetooth accelerometers and smartphone apps for floor vibrations or infrared moisture meter and thermo-cameras, to reveal possible water infiltration and capillary rise. The experimental results obtained by the in-field analyses will be thus addressed by comparison with the above reference ones, and practical recommendations and guideline performance indicators will be provided to city management office, to support a rapid and efficient diagnostic protocol. Some good experimental evidences (i.e. the increased flexural stiffness and the reduction of brittle failure mechanisms)of structural short supply chain timber products such as beech CLT panels and glulam beams obtained in (Sciomenta et al., 2021, Sciomenta et al., 2022), suggest the possibility to apply theseelements in possible retrofitting interventions on floors and walls. References CEN (2004) Eurocode 8: Design of structures for earthquake resistance - Part 3: Assessment and retrofitting of buildings. European Committee for Standardization, Brussels De Agostini L., (2010). “Progetto C.A.S.E. Complessi Antisismici Sostenibili ed Ecocompatibili. Il futuro del legno in edilizia”. Online at http://www.promolegno.com/ (in Italian). Dipartimento della Protezione Civile - Presidenza del Consiglio dei Ministri (2018). Dossier Case - Complessi Antisismici Sostenibili ed Ecocompatibili. Online at http://www.protezionecivile.gov.it/ (in Italian). Negri M., Gavric I., Marra M., Fellin M., Ceccotti A., (2012). “Using low quality timber for X-LAM: Raw material characterisation and structural performance of walls under semidynamic solicitations”. Shabani, A.; Alinejad, A.; Teymouri, M.; Costa, A.N.; Shabani, M.; Kioumarsi, M. Seismic Vulnerability Assessment and Strengthening of Heritage Timber Buildings: A Review. Buildings 2021, 11, 661. https://doi.org/10.3390/ buildings11120661 Sciomenta M., Spera L., Bedon C., Rinaldi V., Nocetti M., Brunetti M., Fragiacomo M., Romagnoli M. “Mechanical characterization of novel Homogeneous Beech and hybrid Beech-Corsican Pine thin Cross-Laminated timber panels”. Constr. Build. Mater., vol. 271, 2021, doi: 10.1016/j.conbuildmat.2020.121589