碳纤维增强复合材料布加固损伤预应力混凝土梁剥离性能试验分析

碳纤维增强复合材料(CFRP)布用于普通混凝土结构加固性能研究较为深入,而对于预应力混凝土结构加固性能的研究相对较少。为了研究CFRP布加固损伤预应力混凝土结构黏结性能对其受力性能的影响,通过对3根CFRP布加固不同损伤程度的高强预应力钢筋混凝土梁进行静载试验,研究损伤程度及预应力度对其黏结性能的影响。试验发现,试件破坏前CFRP布均发生剥离,达到破坏时,CFRP布完全剥离、拉断或受压区混凝土被压碎。通过CFRP布应变-荷载曲线及试件挠度-荷载曲线分析表明,试件的剥离荷载与其损伤程度呈反比,而与预应力度呈正比。

EXPERIMENTAL ANALYSIS OF DEBONDING FAILURE OF STRENGTHENING PRESTRESSED RC BEAM WITH CFRP SHEETS

Though the performance of ordinary RC structures strengthened with CFRP sheet has been deeply studied,the research on the strengthened performance of prestressed concrete structures is seldom. Therefore,in order to study the influence of the bonding performance between CFRP sheets and the prestressed concrete structures on its structural behavior,the static tests of 3 high strength prestressed RC beam with different damage degree strengthened by CFRP sheets were carried out to study the influence of damage degree and prestressed degree on its bonding performance.Test result shows that CFRP sheets are all debonded before the specimen damaged,when the test specimen is damaged,CFRP sheets completely debonded,tensile failure or the concrete crushed in the compressive zone. The CFRP sheet-load curve and deflection-load curve of the test specimens show that the debonding load of the specimens is inversely proportional to its damage degree,but is proportional to the prestressed degree.