湖南大学学报（自然科学版）2016，Vol.43Issue(11)：47-54,8.
抗剪加固用U形纤维布条带预应力系统设计及试验
Design and Experiment Study of Prestressing System for U-shaped FRP Sheet in Shear Strengthening
摘要
Abstract
In the shear strengthened reinforced concrete (RC)beams by externally bonded fiber rein-forced polymer (FRP)composite,there are some main shortcomings including low fiber utilization,pre-mature debonding,and stress hysteresis of the FRP,etc.In order to address these problems,this paper independently developed a novel prestressing system for U-shaped FRP sheet in shear strengthening, which consists of three parts:anchor device,tension device,and steel angle.The design method of com-ponent size and the prestress construction technology were presented.Furthermore,a prestressing system for 2-ply and 50-mm-wide FRP sheet was designed and manufactured.One bearing capacity test of linearFRP sheet and eight prestressing loss tests of shear-strengthened FRP strips were conducted in this sys-tem.The test results show that:the prestressing system can effectively anchor FRP and result in rupture failure;fiber strength increases up to 96.1%;design method of component size is safe and reliable;pres-tressing construction technology can exert different prestress values to FRP strip based on the uniformity and symmetry of the strip stress;the system is applicable to exert the prestress more than 244.84 MPa to the FRP;and the long-term prestress loss ratio is about 1 5%.关键词
预应力系统/U形纤维布/抗剪加固/锚固/预应力损失Key words
prestressing system/U-shaped FRP sheet/shear strengthening/anchorage/prestress loss分类
建筑与水利引用本文复制引用
刘君,周朝阳,韩殿牧原,赵波涌,任达..抗剪加固用U形纤维布条带预应力系统设计及试验[J].湖南大学学报（自然科学版）,2016,43(11):47-54,8.基金项目
国家自然科学基金资助项目(51378507),National Natural Science Foundation of China(51378507) （51378507）
中南大学教师研究基金资助项目(2013JSJJ019) （2013JSJJ019）
