碳纤维布改善高强混凝土性能的研究

RESEARCH ON NEW METHOD OF IMPROVING PROPERTIES OF HIGH STRENGTH CONCRETE BY USING CONTINUOUS CARBON FIBER SHEET

研究了碳纤维布对提高高强混凝土抗压强度和改善其延性的作用。试验发现 ,包裹碳纤维布可以提高试件的抗压强度 ,并有效地改善混凝土的变形性能 ,其效果随碳纤维用量的增加而更加显著。根据提供的公式 ,可以将碳纤维用量折换成等效箍筋用量。同时 ,在试验的基础上 ,根据理论分析和对试验结果的整理 ,归纳出了碳纤维布约束高强混凝土的应力 -应变全曲线方程。最后 ,利用提出的全曲线方程 ,编制了有关计算分析程序 ,分析了包裹碳纤维布对提高高强混凝土压弯构件的强度和延性的作用。

The stress\|strain curve of high strength concrete (HSC)confined by continuous carbon fiber sheet(CFS) is studied analytically and experimentally.Eight CFS\|strengthened HSC prisms are tested.The experimental results indicate that the confinement of CFS,which is similar to that of transverse reinforcement,can increase the ductility and compressive strength of concrete.The paper proposes the stress\|strain curve of this kind of hybrid specimen,which agrees well to the experimental results.Based on the stress\|strain relationship and the assumptions proposed in this paper,a computer program is developed to analyze HSC columns,confined by CFS,which are subjected to axial compression and biaxial bending.Calculated results shown in this paper indicate that the ductility of HSC column is significantly improved and the strength is also increased by some degree.