工艺与制造英文2020被引 61
玻纤增强复合材料筋在持续荷载与恶劣环境复合作用下的长期性能与耐久性预测
Prediction of the Long-Term Performance and Durability of GFRP Bars under the Combined Effect of a Sustained Load and Severe Environments
Jianwei Tu, Hua Xie, Kui Gao · Wuhan University of Technology
摘要整理
随着生产工艺的不断发展，玻纤增强复合材料（GFRP）筋的性能也在变化，部分设计规范已不适用于基于以往研究结果的新型材料。本研究对新一代GFRP筋在实验室模拟海水和混凝土环境中、不同温度和持续荷载条件下进行了一系列耐久性试验。通过分析残余抗拉性能来研究GFRP筋的耐久性表现，并采用扫描电子显微镜（SEM）分析了GFRP筋的降解机制。利用Arrhenius理论预测了GFRP筋在混凝土孔隙溶液中不同应力水平下的长期性能。研究结果表明：在40%应力水平下，GFRP筋的降解速率显著增加；通过对比试验结果、设计限值和其他学者的研究成果，证明本试验所用GFRP筋具有良好的耐久性能；GFRP筋的主要降解机制是纤维-基体界面的脱粘；在试验范围内，20%应力水平对GFRP筋降解的影响不明显，但长期性能预测结果表明，当暴露时间足够长时，20%应力水平会加速降解过程。
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