PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 2015–2021

© 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: Type your keywords here, separated by semicolons ; Abstract This paper presents the experimental behaviour of a composite CHS-to-I beam joint, where the connection between the two is made by plates passing through the column via specific laser cuts realised on the latter. The plates are welded to the column, which is filled with concrete. The system is also equipped with a composite slab connected to the beams through shear studs. The node has been designed to observe failure in the welds, which have been designed with enhanced calculations from previous dedicated tests, and with care in realisation to fully penetrate through the surfaces to be connected. The behaviour of the node under monotonic horizontal load has been observed, and finally, numerical models have been developed to understand the behaviour of all the components better. 1. Introduction Connections between Circular Hollow Section (CHS) columns and I-beams represent a critical point in steel and composite structures, especially under seismic loading (Kanyilmaz (2019)). Traditional welded or diaphragm-based solutions often exhibit brittle failure modes or excessive deformation in the column wall, thereby compromising overall ductility (Alostaz et al. (1996), Schneider et al. (1998), Bagheri Sabbagh et al. (2013)). To go beyond traditional XX ANIDIS Conference Seismic behaviour of enhanced composite CHS-to-I beam joints with passing through plates Agnese Natali* a , Francesco Fabbri a , Daniele Mattoccia a , Francesco Morelli a a Dipartimento di Ingegneria Civile e Industriale, Università di Pisa, Largo Lucio Lazzarino 2, Pisa 56122, Italy

* Agnese Natali Tel.: +; fax: +0-000-000-0000 . E-mail address: agnese.natali@unipi.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.2025.12.256