湿热环境下预应力CFRP加固高强混凝土的耐久性
Durability of High Strength Concrete Strengthened with Prestressed CFRP Under Wet-thermal Environments

通过试验研究了湿度为98%，温度分别为20 ℃，40 ℃，60 ℃的湿热环境下预应力碳纤维增强复合塑料（CFRP）加固高强混凝土的破坏形态和承载性能，分析了预应力等级、温度、环境作用时间等因素对加固试件耐久性的影响。结果表明：经过湿热环境作用后，施加预应力等级为CFRP极限抗拉强度30%的预应力加固试件的开裂荷载和极限荷载均有不同程度的下降；随着环境温度的提高，加固试件的破坏形态逐渐由弯剪破坏转变为弯曲破坏；湿热环境作用对预应力CFRP加固试件的整体不利影响大于非预应力试件，并且随着预应力增加，不利影响会进一步加剧。
The failure patterns and bearing performances of high strength concrete specimens strengthened with prestressed carbon fiber reinforced polymer（CFRP）were studied by experiments under wet？？thermal environment where the humidity was 98% and the temperatures were 20 ℃, 40 ℃, 60 ℃. The influences of different factors including prestressed degree, temperature and environment action time on durability of strengthened specimens were analyzed. The results show that the cracking loads and ultimate loads of specimens strengthened with prestress being 30% of tensile strength for prestressed CFRP decline in varying degrees after being subjected to wet-thermal environments. With rising of the environment temperature, the failure patterns change from bending shear failure to flexural failure. In addition, the overall adverse effects of wet？？thermal environments on specimens strengthened with prestressed CFRP are greater than those on specimens strengthened without prestressed CFRP, and the adverse effect will be aggravated when prestress rises