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为掌握高温对纤维增强复合材料（fiber reinforced polymer,FRP）筋力学性能的影响规律，通过大批量高温后的剪切与受压试验，研究了不同高温、恒温时间、保护层厚度等因素对不同直径玻璃纤维增强复合材料（glass fiber reinforced polymer,GFRP）筋与玄武岩纤维增强复合材料（basalt fiber reinforced polymer,BFRP）筋的影响。通过扫描电子显微镜（SEM），从微观层次揭示了GFRP与BFRP筋在不同高温、恒温时间作用后的损伤特征。试验结果表明，BFRP筋强度退化程度略高于GFRP筋，FRP筋直径越小高温后残余强度越高，16 mm以上时直径对强度影响不大。FRP筋高温后强度在300℃之前下降有限，之后则随着温度升高迅速下降，达到300℃时GFRP、BFRP筋的强度分别下降37.7%、36.4%。高温后抗压强度退化程度高于剪切强度，且直径越大的FRP筋强度退化越显著。恒温1 h与2 h时，FRP筋抗剪强度的降低程度接近，且小于3 h时的结果。在300℃以内砂浆保护层可有效保护筋材，300℃后试件裂缝快速发展导致保护作用消失，内部筋材剪切强度随温度的退化趋势接近于裸筋。基于试验结果建立了高温后GFRP和BFRP筋在不同砂浆保护层厚度下的抗剪和抗压强度预测公式。结合贝叶斯信息准则和概率检验方法，提出一种高温后FPR筋强度概率模型的建立方法，建立了合适的GFRP筋和BFRP筋高温后剪切强度和抗压强度概率模型，量化了其变异性。本文研究结果可为高温后FRP筋混凝土结构的力学性能评估提供材料模型。
Abstract：To understand the influence of high temperatures on the mechanical properties of fiber reinforced polymer(FRP) rebars, a large batch of shear and compression tests were conducted after high temperatures to study the effects of different factors such as high temperature, constant temperature time, and protective layer thickness on glass fiber reinforced polymer(GFRP) bars and basalt fiber reinforced polymer(BFRP) bars with different diameters. The damage of GFRP and BFRP reinforcement due to high temperatures was revealed at the microscopic level through scanning electron microscopy(SEM). The test results show that the strength degradation of BFRP bars is slightly higher than that of GFRP bars. The smaller the diameter of the FRP bars, the higher their residual strength after high temperatures. However, when the diameter reaches above 16 mm, the impact of diameter on strength is not significant.The strength of FRP bars decreased limitedly before 300 ℃ high temperature, and then rapidly decreases with increasing temperature. When reaching 300 ℃, the strength of GFRP and BFRP bars decreases by 37.7% and 36.4%, respectively. The degree of compressive strength degradation after high temperature was higher than that of shear strength,and the larger the diameter of FRP bars, the more significant the strength degradation. The reduction in shear strength of FRP bars was similar for a constant temperature of 1 hour and 2 hours, and was larger after 3 hours. The mortar protective layer can effectively protect the reinforcement material within 300 ℃. After 300 ℃, the rapid development of cracks in the specimen caused the disappearance of the protective effect. The shear strength of the internal FRP bars showed a degradation trend close to that of bare bars. Based on experimental results, shear and compressive strength prediction formulas for GFRP and BFRP bars were established after high temperature. A method for establishing probabilistic strength model of FRP bar after high temperatures was proposed by combining Bayesian information criteria and probability testing methods. Finally, suitable probability models for the shear and compressive strength of GFRP and BFRP bars after high temperatures were established, and their variability was also quantified. These findings provide critical material models for evaluating the mechanical performance of FRP-reinforced concrete structures after high-temperature exposure.
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基本信息:
中图分类号:TU377.9;TB332
引用信息:
[1]谢青海,曾杰,文哲鸣,等.纤维增强复合材料筋高温后力学性能及其变异性研究[J].南通大学学报(自然科学版),2026,25(02):86-94.
基金信息:
国家自然科学基金青年科学基金项目（52408177）; 中国博士后科学基金项目（2020M681390）; 江苏海洋大学研究生科研与实践创新计划（KYCX2024-60）
2025-09-04
2025-09-04
2025-09-04