Publikace detail

CFRP-based structural repairing and strengthening of deficient cast-in-place RC foundation-column joints

Autoři: Yurdakul Özgür | Řoutil Ladislav | Culek Bohumil | Avsar Ozgur

Rok: 2025

Druh publikace: článek v odborném periodiku

Název zdroje: Engineering Structures

Název nakladatele: Elsevier Science

Místo vydání: Oxford

Strana od-do: nestránkováno

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	CFRP-based structural repairing and strengthening of deficient cast-in-place RC foundation-column joints	The foundation-column joint (FCJ) is a critical structural component in moment-resisting reinforced concrete (RC) frames. Field observations from recent seismic events have shown that exterior or corner cast-in-place RC FCJs without transverse reinforcement were prone to damage, impairing the seismic performance of the entire structural system. Such joints, commonly found in T & uuml;rkiye and other seismically active regions with inadequate construction and inspection practices, experienced concrete cover crushing, followed by buckling of the longitudinal reinforcement. This study investigated the cyclic response of a deficient and carbon fiber-reinforced polymer (CFRP)-strengthened exterior RC FCJ, along with the repair of a pre-damaged FCJ using CFRP, through a combined experimental and numerical approach. A code-compliant FCJ with proper transverse reinforcement was also tested as a reference, which primarily exhibited a flexural hinge at the column base. The deficient FCJ exhibited failure due to concrete crushing and longitudinal bar buckling within the foundation panel-consistent with post-earthquake field evidence. CFRP repair of the pre-damaged FCJ effectively mitigated further panel deterioration. Additionally, the CFRP strengthening scheme applied prior to damage significantly improved both the strength and displacement capacities of the deficient FCJ, outperforming even the codecompliant specimen. The results confirmed that CFRP application to joint panel was highly effective in enhancing the cyclic performance of exterior FCJs lacking transverse reinforcement.	Foundation column joint; Retrofit; Substandard; CFRP; Confinement
eng	CFRP-based structural repairing and strengthening of deficient cast-in-place RC foundation-column joints	The foundation-column joint (FCJ) is a critical structural component in moment-resisting reinforced concrete (RC) frames. Field observations from recent seismic events have shown that exterior or corner cast-in-place RC FCJs without transverse reinforcement were prone to damage, impairing the seismic performance of the entire structural system. Such joints, commonly found in T & uuml;rkiye and other seismically active regions with inadequate construction and inspection practices, experienced concrete cover crushing, followed by buckling of the longitudinal reinforcement. This study investigated the cyclic response of a deficient and carbon fiber-reinforced polymer (CFRP)-strengthened exterior RC FCJ, along with the repair of a pre-damaged FCJ using CFRP, through a combined experimental and numerical approach. A code-compliant FCJ with proper transverse reinforcement was also tested as a reference, which primarily exhibited a flexural hinge at the column base. The deficient FCJ exhibited failure due to concrete crushing and longitudinal bar buckling within the foundation panel-consistent with post-earthquake field evidence. CFRP repair of the pre-damaged FCJ effectively mitigated further panel deterioration. Additionally, the CFRP strengthening scheme applied prior to damage significantly improved both the strength and displacement capacities of the deficient FCJ, outperforming even the codecompliant specimen. The results confirmed that CFRP application to joint panel was highly effective in enhancing the cyclic performance of exterior FCJs lacking transverse reinforcement.	Foundation column joint; Retrofit; Substandard; CFRP; Confinement

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