PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 1277–1284

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: Non-structural elements, Floor response spectra, Building codes, Seismic safety; Abstract Seismic performance of Non-Structural (NS) components represents a key aspect in the analysis of both new and existing buildings. A significant number of these components can be classified as acceleration-sensitive and are often assumed dynamically uncoupled from the primary structural system. This assumption supports the widespread use of Floor Response Spectrum (FRS) approaches, which are well-established in the scientific literature and adopted by many building codes. This study provides the background of the formulation reported in the Italian Standards (NTC 2018) for FRS, involved in estimating the seismic demand of non-structural elements. At first, the theoretical basis of the formulation is provided. Then, parametric analyses are carried out on frame structures, aimed at calibrating the formulation proposed for the amplification factor R. Finally, for a case study the FRS derived with the formulation proposed are compared with the ones adopted by several international standards. 1. Introduction Non-Structural Elements (NSEs) are building components that, although not part of the primary load-bearing or seismic-resisting system, are nonetheless subjected to significant dynamic forces and deformations during seismic events. Despite their non-structural role, their importance is now widely acknowledged, particularly with regard to XX ANIDIS Conference Floor response spectra for seismic design of non-structural elements according to the Italian NTC 2018 Lorenzo Audisio a, *, Matteo Tatangelo a , Michele D’Amato b , Rosario Gigliotti a a DISG – Dept. of Structural and Geotechnics Engineering, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy b DIUSS – Dept. for Humanistic, Scientific and Social Innovation , University of Basilicata, Via Lanera, 75100 Matera, Italy

* Corresponding author. E-mail address: lorenzo.audisio@uniroma1.it

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 10.1016/j.prostr.2025.12.163