预应力CFRP容许张拉预应力值的研究  

Investigation into Permissible Tensional Prestress of Prestressed Carbon Fiber-Reinforced Polymer

作　　者：郭馨艳[1] 黄培彦[1] 郑小红[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2009年第6期96-100,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10672060);广东省自然科学基金资助项目(07006538)

摘　　要：将预应力碳纤维增强复合材料(CFRP)粘贴到需要补强的钢筋混凝土(RC)梁上,可以有效地改善结构的力学性能,提高加固效率.但CFRP的张拉预应力值并不是越大越好.文中从混凝土抗拉强度、混凝土和CFRP层界面抗剪强度以及CFRP抗拉强度控制3个方面出发,探讨了预应力CFRP增强RC梁的容许张拉预应力值,并通过算例分别计算了混凝土拉裂缝产生、界面剥离以及CFRP先于钢筋破坏时的容许张拉预应力值,发现界面发生剥离时的容许张拉预应力值最低.Bonding prestressed carbon fiber-reinforced polymer （carbon FRP, CFRP） plates to reinforced concrete （RC） beams can improve the working efficiency and force conditions of structures. However, larger tension prestress is not always better. In this paper, the permissible tensional prestress of the RC beams strengthened with pre- stressed CFRP is discussed in terms of the tensile strength of concrete, the shear strength of interface between concrete and CFRP, and the tensile strength of CFRP. Moreover, the permissible tensional prestresses in the concrete tensile-cracking, interface debonding and CFRP fracture before steel bar are respectively calculated. It is found that the permissible tensional prestress in interface debonding is the lowest.

关 键 词：钢筋混凝土梁 加固 预应力碳纤维增强复合材料 容许张拉预应力 

分 类 号：O346.1[理学—固体力学]