海水干湿循环作用下CFRP-高强混凝土黏结性能研究

发布时间：2018-04-06 00:28

本文选题：CFRP　切入点：高强混凝土　出处：《大连理工大学学报》2015年02期

【摘要】：在沿海地区,海水干湿循环成为限制CFRP(碳纤维增强复合材料)在加固混凝土结构应用中的主要因素之一.考虑结构自身荷载和海水干湿循环作用,用5%NaCl溶液模拟海水,利用发明的持载装置施加持续荷载,采用双面剪切试验方法对CFRP与高强混凝土的界面黏结性能进行了研究.结果表明:海水干湿循环作用下界面黏结性能发生显著的退化,极限荷载、剥离荷载、端部滑移、断裂能等界面参数均显著降低;而持续荷载和干湿循环耦合作用下界面黏结性能退化更加严重,黏结界面参数进一步降低.因此未考虑持续荷载作用而对CFRP-高强混凝土界面耐久性的研究将会过高地估算界面的黏结性能.
[Abstract]:In coastal areas, dry and wet circulation of seawater has become one of the main factors limiting the application of CFRP (carbon fiber reinforced composites) in strengthening concrete structures.Considering the self-loading of the structure and the dry and wet circulation of seawater, the interface bonding behavior between CFRP and high strength concrete was studied by using the double-plane shear test method. The seawater was simulated with 5%NaCl solution, and the continuous load was applied to the device.The results show that the interfacial adhesion energy degenerates significantly under dry and wet circulation, and the interface parameters such as ultimate load, peeling load, tip slip and fracture energy decrease significantly.However, the degradation of interfacial bonding performance is more serious and the interface parameters are further reduced under the coupling of dry and wet cycles.Therefore, the study of the interface durability of CFRP- high strength concrete without considering the continuous load will overestimate the bond performance of the interface.
【作者单位】：大连理工大学建设工程学部土木工程学院;
【基金】：国家自然科学基金资助项目(51378089) 大连理工大学海岸和近海工程国家重点实验室基金资助项目(SL14-3-2)
【分类号】：TU37

【相似文献】