ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XX - 2025

Dimensione del carattere:  Piccola  Media  Grande

Seismic strengthening of exterior RC beam-column joint: basalt vs. carbon FRCM systems

Teklewoin Haile Fitwi, Klajdi Toska, Flora Faleschini, Lorenzo Hofer, Dario De Domenico, Giuseppe Ricciardi, Carlo Pellegrino

Ultima modifica: 2025-08-11

Sommario


This study investigates whether basalt fiber reinforced cementitious matrix (FRCM) systems can serve as a viable alternative to carbon FRCM for seismic strengthening of deficient reinforced concrete beam-column joints. The experimental program includes an un-strengthened control specimen tested directly to complete failure to establish baseline performance, and two specimens subjected to a damage-strengthening-retest protocol where they are initially loaded to 85% of their ultimate capacity to simulate realistic seismic damage conditions, subsequently unloaded, retrofitted with either carbon or basalt FRCM systems, and then tested to failure. All specimens are instrumented to capture the structural response throughout the loading history. Performance is quantified using normalized indices accounting for material property variations, allowing for direct comparative analysis between un-strengthened, carbon-strengthened, and basalt-strengthened configurations. Strength enhancement, ductility improvement, and energy dissipation capacity were analyzed to evaluate the relative efficacy of basalt FRCM compared to both conventional carbon systems and un-strengthened conditions. Preliminary results indicate that while carbon FRCM achieved marginally superior strength and energy dissipation capacity, the basalt system demonstrated significant enhancement in both parameters while providing comparable ductility improvement. Both strengthening systems effectively modified the failure mechanism from brittle joint shear to a more favorable beam-joint interaction mode. 

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