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通过对真实混凝土环境下玻璃纤维增强复合材料(GFRP)筋的耐久性试验,研究混凝土构件服役状态时所承受的静荷载、裂缝等因素对GFRP筋抗拉强度的影响,并与模拟混凝土孔隙水溶液碱环境下GFRP筋的抗拉强度退化率进行对比分析。试验结果表明:静荷载对混凝土环境作用下GFRP筋抗拉强度的退化有一定的影响,随着荷载的增大,筋体强度退化率也越快;GFRP筋抗拉强度退化率在有工作裂缝的混凝土试件中大于无工作裂缝混凝土环境;模拟混凝土碱环境下浸泡的GFRP筋长期力学性能退化率较快,与实际混凝土环境下GFRP筋的退化规律相比存在一定的偏差,因此,相应试验数据以及在此基础上建立的抗拉强度退化模型偏于保守。
Through the durability test of GFRP tendons in real concrete environment, the effects of static load, cracks and other factors on the tensile strength of GFRP tendons were studied. The results were compared with that of simulated concrete pore water solution The degradation rate of tensile strength of GFRP tendons in alkali environment was compared. The test results show that static load has some influence on the degradation of tensile strength of GFRP tendons under concrete environment. With the increase of load, the strength degradation rate of tendons is also faster. The degradation rate of tensile strength of GFRP tendons is higher than that of working crevices Of the concrete specimens is larger than that of the non-working cracked concrete. The degradation rate of GFRP tendons immersed in the simulated concrete in alkaline environment is faster than that of the GFRP tendons in actual concrete environment. Therefore, The data and the tensile strength degradation model established on this basis are conservative.