CFRP-strengthened RC beams under fire condition: numerical model

Carlos, Thiago Brazeiro; Silva, Valdir Pignatta e

doi:10.1590/S1983-41952023000200002

Acessibilidade / Reportar erro

Brasil

Revista IBRACON de Estruturas e Materiais

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

ORIGINAL ARTICLE • Rev. IBRACON Estrut. Mater. 16 (2) • 2023 • https://doi.org/10.1590/S1983-41952023000200002 copy

CFRP-strengthened RC beams under fire condition: numerical model

Vigas de concreto armado reforçadas com CFRP em situação de incêndio: modelo numérico

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The Carbon Fiber Reinforced Polymer (CFRP) has excellent flexural performance on strengthening and rehabilitation of reinforced concrete (RC) structures. However, it is known that CFRP strengthening systems are very vulnerable to high thermal exposure. To provide a better understanding of its fire behavior and fulfill gaps in this field, this investigation proposes the development of an accurate three-dimensional (3D) Finite Element (FE) model capable of simulating the CFRP-strengthened RC beams flexural behavior at ambient temperature and under fire conditions. To achieve the goals, thermal and mechanical numerical simulations have been performed to validate the developed FE models. Experimental results reported in two parallel studies were used to model’s validation. The numerical model has been satisfactorily validated and the results had a good predictability with the experimental results in terms of thermal and mechanical behavior.

Keywords:
fire; reinforced concrete structures; beam; CFRP strengthening; numerical model

unstrengthened RC beam	FR_time at 50 mm displacement (min)		FR_time at 75 mm displacement (min)		FR_time at beam failure instant (min)		FR_time ratio at failure instant of the beam
	Exp. [³²32 T. B. Carlos, J. P. C. Rodrigues, R. C. A. Lima, and D. Dhima, “Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions,” Composite Structures, vol. 189, no. 2017, pp. 516–528, 2018, http://dx.doi.org/10.1016/j.compstruct.2018.01.094. http://dx.doi.org/10.1016/j.compstruct.2... ]	Num.	Exp. [³²32 T. B. Carlos, J. P. C. Rodrigues, R. C. A. Lima, and D. Dhima, “Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions,” Composite Structures, vol. 189, no. 2017, pp. 516–528, 2018, http://dx.doi.org/10.1016/j.compstruct.2018.01.094. http://dx.doi.org/10.1016/j.compstruct.2... ]	Num.	Exp. [³²32 T. B. Carlos, J. P. C. Rodrigues, R. C. A. Lima, and D. Dhima, “Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions,” Composite Structures, vol. 189, no. 2017, pp. 516–528, 2018, http://dx.doi.org/10.1016/j.compstruct.2018.01.094. http://dx.doi.org/10.1016/j.compstruct.2... ]	Num.	FR_time ratio at failure instant of the beam
		57.0	54.9	72.3	69.5	78.2	74.5	0.95
CFRP-strengthening system	FR_time,CFRP at 5 mm displacement (min)		FR_time,CFRP at 8 mm displacement (min)		FR_time,CFRP at CFRP failure instant (min)		FR_time,CFRP ratio at failure instant of the CFRP system
	Exp. [³²32 T. B. Carlos, J. P. C. Rodrigues, R. C. A. Lima, and D. Dhima, “Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions,” Composite Structures, vol. 189, no. 2017, pp. 516–528, 2018, http://dx.doi.org/10.1016/j.compstruct.2018.01.094. http://dx.doi.org/10.1016/j.compstruct.2... ]	Num.	Exp. [³²32 T. B. Carlos, J. P. C. Rodrigues, R. C. A. Lima, and D. Dhima, “Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions,” Composite Structures, vol. 189, no. 2017, pp. 516–528, 2018, http://dx.doi.org/10.1016/j.compstruct.2018.01.094. http://dx.doi.org/10.1016/j.compstruct.2... ]	Num.	Exp. [³²32 T. B. Carlos, J. P. C. Rodrigues, R. C. A. Lima, and D. Dhima, “Experimental analysis on flexural behaviour of RC beams strengthened with CFRP laminates and under fire conditions,” Composite Structures, vol. 189, no. 2017, pp. 516–528, 2018, http://dx.doi.org/10.1016/j.compstruct.2018.01.094. http://dx.doi.org/10.1016/j.compstruct.2... ]	Num.	FR_time,CFRP ratio at failure instant of the CFRP system
	12.2	11.8	23.0	20.1	30.5	27.7	0.91

IBRACON - Instituto Brasileiro do Concreto Instituto Brasileiro do Concreto (IBRACON), Av. Queiroz Filho, nº 1700 sala 407/408 Torre D, Villa Lobos Office Park, CEP 05319-000, São Paulo, SP - Brasil, Tel. (55 11) 3735-0202, Fax: (55 11) 3733-2190 - São Paulo - SP - Brazil
E-mail: arlene@ibracon.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] Corresponding author: Thiago Brazeiro Carlos. E-mail: thiago_brazeiro@hotmail.com