Vol. 20, No. 3, pp. 292-299 (2024)
BENDING ANALYSIS OF RECYCLED CONCRETE BEAMS REINFORCED
WITH GFRP BARS UNDER HIGH TEMPERATURE
Qi Guo 1, 2 and Hao Chen 3, *
1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shanxi, China.
2 Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT),
Xi’an 710055, Shanxi, China.
3 XAUAT UniSA An De College, Xi’an University of Architecture and Technology, Xi’an 710311, Shanxi, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 13 November 2023; Revised:28 May 2024; Accepted: 11 June 2024
DOI:10.18057/IJASC.2024.20.3.8
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ABSTRACT
GFRP (Fiber Reinforced Polymer) reinforcement material is characterized by high strength and excellent corrosion resistance, which exhibits promising application prospects in engineering. The GFRP reinforcement for steel-concrete beams can increase the structural load-bearing capacity and durability. In this study, a refined finite element model of high-temperature GFRP-reinforced recycled steel-concrete beams was established by using ABAQUS software. The temperature distribution and residual load-carrying capacity of GFRP-reinforced recycled steel-concrete beams were analyzed, and the reliability of the model was validated based on the results of full-scale experiments on 16 groups of recycled steel-concrete beams. By using the validated model, the influence of heating temperature, reinforcement strength, steel strength, strengthening method, and concrete strength on the residual load-carrying capacity of the structure was analyzed. The stress patterns and failure mechanisms of GFRP-reinforced recycled steel-concrete beams were also analyzed. As can be seen from the results, the Type II strengthening method significantly increased the load-carrying capacity of recycled steel-concrete beams. It was also found that the load-carrying capacity of the tested beams was greatly affected by temperature. Under the temperature of 200℃ and 600℃, the load-carrying capacity of the unreinforced specimens decreases by approximately 13% and around 25%, respectively. Under the same heating temperature, compared to the unreinforced specimens, the load-carrying capacity was increased by approximately 10% by using the Type I strengthening method, but only around 4.7% by the Type II strengthening method. Finally, based on the results of this study and existing relevant experimental and numerical simulation results, and considering its feasibility and effectiveness, the Type I strengthening method for reinforced recycled steel-concrete beams was proposed. In general, the research findings of this paper can provide theoretical support for the design of reinforced recycled steel-concrete beams.
KEYWORDS
GFRP reinforcement, High temperature, Steel-reinforced recycled aggregate concrete beams, Residual load-carrying capacity, Bending performance
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