PSI - Issue 78

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 78 (2026) 1775–1782

© 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: Basalt fibers, Carbon fibers, FRCM composites, seismic strengthening, beam-column joints. Abstract This study examines fabric-reinforced cementitious matrix (FRCM) systems, with carbon and basalt fibers, to strengthen seismically deficient, exterior reinforced concrete (RC) beam-column joints. The experimental program includes a control specimen, tested to complete failure to establish baseline performance, and two specimens subjected to an FRCM strengthening procedure, respectively one with carbon FRCM and one with basalt FRCM. Before FRCM application specimens were initially loaded up to 85% of their ultimate capacity to simulate realistic seismic damage conditions, and then tested to failure after the retrofitting intervention. All specimens were instrumented to capture the structural response throughout the loading history. Strength enhancement and energy dissipation capacity were analysed to evaluate the relative effectiveness of carbon and basalt FRCM compared to un-strengthened conditions. Results indicate that both carbon and basalt FRCM composites achieved a significant strength enhancement while providing also additional energy dissipation capability. Finally, both strengthening systems effectively modified the failure mechanism from brittle joint shear failure to a more favourable beam-joint failure mode. XX ANIDIS Conference Seismic strengthening of exterior RC beam-column joint: basalt vs. carbon FRCM systems Teklewoin Haile Fitwi a , Klajdi Toska a , Flora Faleschini a, *, Lorenzo Hofer a , Dario De Domenico b , Giuseppe Ricciardi b , Carlo Pellegrino a a Department of Civil, Environmental and Architectural Engineering, University of Padova, via F. Marzolo 9, Padova, Italy b Department of Engineering, University of Messina, Contrada Di Dio, Messina, Italy.

* Corresponding author. Tel.: +39 049 827 5585 . E-mail address: flora.faleschini@dicea.unipd.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.2025.12.226