GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 2.2 247 SEISMIC VULNERABILITY OF HISTORIC GLASS ENVELOPES: TOWARDS A STANDARDIZED EVALUATION PROTOCOL FOR HARMONIZED PERFORMANCE CHECK C. Bedon University of Trieste, Department of Engineering and Architecture, Trieste, Italy Design of glass element under seismic loads . Glass components are of common use in modern architecture and even design concepts. Dedicated calculationmethods can be adopted to ensure appropriate performances and safety levels in the framework of well-known Limit State concept for ordinary buildings. More specifically, technical guidelines and documents of relatively recent elaboration are nowadays conceived to support structural designers in the realization of load-bearing glass elements with primary or secondary or even non-structural role in buildings, under the effects of various ordinary or accidental design actions (Bedon et al., 2019). Among others, the CNR-DT 210/2013 technical document provides specifications for the seismic analysis and verification of building elements made of structural glass. In this context, the analysis against stress peaks and deformations should be carried out at the component level. Design detailing against seismic action depends on multiple structural and building parameters, as also schematized in Fig. 1. In doing so, the use of double (or more) laminated glass elements is privileged due to the additional plastic and dissipation role of bonding interlayers, hence resulting in improved post-failure mechanical performance and enhanced safety levels for customers. Fig. 1 - Summary of relevant structural and seismic parameters for glass design (CNR-DT 210/2013). In such a kind of design assumptions, a special consideration must be spent for existing (and even historic) glass components, which have been realized without specific consideration for minimum performance capacity against loading conditions of typical interest for buildings. Technical standard documents elaborated for load-bearing glass components are relatively recent. Often, moreover, technical drawings or documents and notes are not available for these glass systems, and hence a vulnerability analysis of the state-of-art situation can result in rather complex assumptions.