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Numerical Modelling of Seismic Behaviour of an Exterior RC Beam Column Joint Strengthened with UHPFRC and CFRP

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Abstract

This paper presents a numerical investigation to study the seismic response of shear deficient beam column joint (BCJ) strengthened with ultra high performance fibre-reinforced concrete (UHPFRC) and/or carbon fibre-reinforced polymer (CFRP) sheet. Two strengthening schemes were planned: (i) cast-in situ UHPFRC layer of 30 mm thickness over normal concrete and (ii) cast-in situ UHPFRC layer over normal concrete followed by CFRP wrapping over the joint area of BCJ. The seismic performance of strengthened BCJs under reverse cyclic loading was determined in terms of hysteresis response, strength and stiffness degradation, ductility and energy dissipation capacity. The strengthened BCJ specimens were tested at two drift ratios, i.e. ± 5% and ± 8.7%, higher drift ratio was chosen to examine the efficacy of strengthening at higher displacements. From the numerical modelling results, it is clear that BCJ strengthened with the second scheme involving the synergistic action of UHPFRC and CFRP can increase their structural stiffness, strength and energy dissipation capacity of BCJ in contrast to other strengthening scheme. The enhanced performance is attributed to superior properties of UHPFRC as a strengthening material, and the role of CFRP, which helped in maximizing the potential of UHPFRC by providing confinement to the concrete thus delaying the damage and resulting in increased energy dissipation.

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Correspondence to Gurbir Kaur.

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Fayaz, Q., Kaur, G. & Bansal, P.P. Numerical Modelling of Seismic Behaviour of an Exterior RC Beam Column Joint Strengthened with UHPFRC and CFRP. Arab J Sci Eng 47, 4971–4986 (2022). https://doi.org/10.1007/s13369-021-06334-8

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  • DOI: https://doi.org/10.1007/s13369-021-06334-8

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