中文摘要：

碳纤维增强聚合物（CFRP）在混凝土结构加固领域正在迅速发展，但关于这类材料的耐久性研究仍不充分，尤其对遭受恶劣环境与荷载耦合作用下的耐久性研究。该文研究冻融循环与荷载双因素作用对CFRP片材长期性能的影响，冻融循环次数分别考虑50次、100次、200次、300次，荷载等级考虑极限荷载的30％和60％。分析了双因素作用后CFRP片材的极限抗拉强度、弹性模量和延伸率的影响。结果表明：荷载与冻融循环双因素作用对CFRP片材的抗拉强度和延伸率影响较大，对弹性模量影响较小。最后给出了冻融循环与荷载共同作用下的CFRP片材剩余强度损伤模型。

英文摘要：

Carbon Fiber-Reinforced Polymer （CFRP） material is increasingly being used for the retrofit and repair of concrete structures. However, there is insufficient information on the environmental durability of CFRP, especially under aggravating environmental conditionings combined with sustained loads. The coupled effects of freeze-thaw cycle and sustained loads on the long term behaviour of CFRP were investigated. The CFRP specimens are subjected to freeze-thaw cycle in an unstressed state or loaded in about 30% or 60% of the initial ultimate load, and there involve, respectively, 50, 100, 200 and 300 times of freeze-thaw cycles in water solution. The ultimate strength, elongation and elastic modulus of CFRP are studied after coupled actions of freeze-thaw cycle and sustained loads. The test results indicate that the coupled action of a freeze-thaw cycle and a sustained load had an effect on ultimate strength and elongation of specimen, while did not have any significant effect on elastic modulus of specimen. A simple residual strength damage model of CFRP under a freeze-thaw cycle and a sustained load is presented.