Abstract: This paper experimentally studied the bending performance of glass/basalt fiber reinforced polymer (GFRP/BFRP) bars after temperature aging treatment, mainly studying the effects of different operating temperature and constant temperature time on the bending performance of two types of FRP bars with different diameters, and scanning electron microscopy (SEM) was used to analyze the microstructure changes and damage mechanism of GFRP/BFRP bars after temperature aging treatment. The test and analysis results indicate that: Ⅰ. The bending strength and maximum strain of GFRP/BFRP bars tend to decrease gradually with increasing temperature after temperature aging treatment, while the bending elastic modulus does not deteriorate significantly and its retention rates are above 90%. Ⅱ. The bending performance of the GFRP bars with larger diameter is obviously degenerated after temperature aging treatment; and the bending performance retention degradation curve of G12 bars is higher than that of B12 bars, indicating that the bending performance of BFRP bars are more sensitive to operating temperature. Ⅲ. In the high temperature environment of 270 ℃, the bending strength of GFRP/BFRP bars tends to decrease linearly with the increase of constant temperature time. Ⅳ. Combined with the test results and SEM microstructural analysis, it can be considered that the main reasons for the degradation of bending strength of two types of FRP bars after temperature aging treatment are the synergistic effect between fiber and resin matrix and the significant decrease of fiber-resin matrix interface performance. Finally, combined with the experimental results of this paper, after temperature aging treatment the calculation model of the bending strength degradation of GFRP/BFRP bars and the linear interpolation prediction method were given to be within 500 ℃, which is convenient for practical engineering applications.
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2021, Vol. 35 
