赵  彤  谢  剑  戴自强
    （天津大学土木工程系  天津 300072）

[提要]  在合理评定碳纤维布有关力学指标的基础上，进行了碳纤维布约束混凝土的受压性能试验。根据试验研究了碳纤维布使用量对普通混凝土抗压强度和变形性能的影响。试验研究发现：试件包裹碳纤维布后可以提高混凝土的抗压强度，并可有效地改善混凝土的变形性能，其效果随碳纤维布用量的增加而增大；在碳纤维布用量相同的情况下，分条包裹的效果要优于整条包裹的效果，即碳纤维布在实际工程应用中有个利用效率的问题。将碳纤维布用量折换成等效箍筋用量，同时根据理论分析和试验结果提出了碳纤维布约束混凝土的受压应力一应变全曲线方程。
[关键词]  碳纤维布  应力  应变

Based on reasonably determining the tensile strength and modulus of elasticity for carbon fiber sheet
(CFS) , the compressive stress-straln curve of concrete confined by CFS is also studied experimentally and analytically. The test results indicate that the confinement of CFS, which is similar to that of transverse reinforcement, can increase the ductility and compressive strength of concrete remarkably.lt is also found that the confining effect of wrapping CFS strips is better than that of wrapping CFS fabric, when the quantity of CFS is constant. Based on the test data analyses, the compressive stress-strain relationship of concrete confined by CFS is proposed. The calculating curves agree well with the experimental curves.
Keywords: carbon fiber sheet; stress; strain