Effects of High Temperatures on the Performance of Carbon Fiber Reinforced Polymer (CFRP) Composite Cables Protected with Fire-Retardant Materials

Zhuge, Ping; Tao, Guocheng; Wang, Bing; Jie, Zhiyu; Zhang, Zihua

doi:10.3390/ma15134696

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…In the study conducted by Zhuge et al [41], they conducted fire resistance tests to investigate the effect of two different fire-retardant materials, high-silica needled felt and ceramic fiber felt, on the fire resistance of CFRP tendons. Their criteria for evaluating fire resistance were based on a reduction in tensile strength and elastic modulus to 80% of their initial properties at 300 • C. In another study conducted by Khaneghahi et al [30], the results revealed that the flexural modulus retention of the composite was stable, staying above 90% of the initial performance after cooling from temperatures below 300-350 • C. Once exceeding the temperature of degradation, there was a rapid loss of flexural modulus retention.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

Effect of Fireproof Coatings on the Post-Fire Behavior of CFRP Composite Sheets

Qiang,

Wang,

Jiang

et al. 2023

Applied Sciences

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This study examines the effect of two self-developed novel fireproof coatings on the fire resistance of carbon fiber-reinforced polymer (CFRP) composite sheets. The post-fire flexural properties were chosen as important indicators of fire resistance. This research involves two distinct fire conditions, the standard fire condition and the large-space fire condition, to simulate general interior fires and large-space fires. The post-fire flexural performance of CFRP sheets coated with two different self-developed fireproof coatings was evaluated through three-point bending tests after fire exposure. The experimental findings demonstrated a significant reduction of up to 80% in the post-fire flexural properties of CFRP sheets without fireproof coatings. However, CFRP sheets coated with fireproof coatings exhibited a substantial enhancement in their post-fire flexural properties. Under the large-space fire condition, the fire-resistance duration of CFRP sheets coated with fireproof coatings of at least 25 mm thickness exceeded 2 h, satisfying the requirements of GB50016-2014 fire-resistance class III (columns), class I (beams), and class I (floor slabs), respectively. Under the standard fire condition, CFRP sheets covered by fireproof coatings of 35 mm thickness exhibited a fire-resistance duration of 0.75 h, meeting the requirements of GB50016-2014 fire-resistance class IV (columns), class IV (beams), and class III (floor slabs), respectively.

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Section: Comparison With Previous Studiesmentioning

confidence: 99%

Effect of Fireproof Coatings on the Post-Fire Behavior of CFRP Composite Sheets

Qiang,

Wang,

Jiang

et al. 2023

Applied Sciences

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“…Of various FRP composites, carbon fiber-reinforced polymer (CFRP) possesses the best resistance to creep, namely, it can sustain around 80% of the tensile strength without experiencing creep rupture [ 9 , 10 ]. Therefore, CFRP is recognized to be ideal for prestressing applications [ 11 , 12 , 13 ]. This non-corrosive composite material is particularly suitable for external tendons in lieu of conventional prestressing steel in overcoming the corrosive problem [ 14 , 15 ], as these tendons are exposed to harsh conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Lou

Pang

2023

Materials

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This work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with external CFRP tendons is carried out. Four tendon-related variables are considered, namely, the area, initial prestress, depth and elastic modulus of tendons. The analysis shows that flexural ductility decreases as the tendon area, initial prestress or elastic modulus increases but is insensitive to the tendon depth. The ultimate tendon stress increment (Δσp) is influenced by all of the four variables investigated. JGJ 92-2016 (Chinese technical specification for concrete structures prestressed with unbonded tendons) significantly underestimates Δσp and, hence, is over-conservative for the strength design of these beams. An equation is proposed for calculating Δσp, taking into account all four variables investigated. An analytical model is then developed to estimate the flexural strength (Mu) of prestressed concrete beams with external CFRP tendons. The proposed analytical model shows good agreement with FEA, i.e., the mean discrepancy for Δσp is 0.9% with a standard deviation of 11.1%; and the mean discrepancy for Mu is −1.6% with a standard deviation of 2.1%.

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“…Fiber reinforced polymer (FRP) composites are recognized as a promising alternative to steel reinforcement in reinforced [ 19 , 20 , 21 , 22 ] and prestressed concrete applications [ 23 , 24 , 25 , 26 ]. This composite reinforcement may be made of carbon FRP (CFRP) [ 27 ], aramid FRP (AFRP) [ 28 ] or glass FRP (GFRP) [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Flexural Response of Axially Restricted RC Beams: Numerical and Theoretical Study

Lopes

et al. 2022

Materials

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Reinforced concrete (RC) frame beams are subject to axial restriction at the ends, which plays an important role in the nonlinear behavior of these beams. This paper presents a numerical and theoretical investigation into the flexural behavior of RC beams axially restricted with external steel or fiber reinforced polymer (FRP) reinforcement. A numerical procedure for RC beams axially restricted with external reinforcement has been developed and it is verified against available experimental results. A numerical parametric study is then performed on axially restricted RC beams, focusing on the effect of type, area, and depth of external reinforcement. The results show that axial restriction increases the post-cracking stiffness and ultimate load-carrying capacity but reduces the flexural ductility. The ultimate stress in external reinforcement is substantially impacted by reinforcement type, area, and depth. A simplified model is developed to predict the ultimate load of RC beams axially restricted with external steel/FRP reinforcement. The predictions of the proposed simplified model agree favorably with the numerical results. The correlation coefficient for the ultimate load is 0.984, and the mean difference is −2.11% with a standard deviation of 3.62%.

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Effects of High Temperatures on the Performance of Carbon Fiber Reinforced Polymer (CFRP) Composite Cables Protected with Fire-Retardant Materials

Cited by 8 publications

References 29 publications

Effect of Fireproof Coatings on the Post-Fire Behavior of CFRP Composite Sheets

Effect of Fireproof Coatings on the Post-Fire Behavior of CFRP Composite Sheets

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Flexural Response of Axially Restricted RC Beams: Numerical and Theoretical Study

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