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通过单束纤维与纤维编织网增强混凝土(TRC)薄板的单轴拉伸试验,研究了环氧树脂浸渍后纤维束的应力-应变关系。试验结果发现,即使经环氧树脂浸渍,也不能完全发挥碳纤维束的抗拉强度;单轴拉伸碳纤维束获得的应力-应变曲线几乎是完全线性的,在达到其极限强度80%左右出现一定的非线性特征。假定细粒混凝土开裂后只有纤维编织网承担荷载,从而由TRC薄板试件单轴拉伸的荷载-变形关系获得的碳纤维束的应力-应变关系可合理简化为双线性的形式,并针对本文中研究的纤维编织网给出了其相应控制参数点的取值。基于受弯构件计算理论,采用本文纤维束拉伸模型得到的两种系列受弯构件的计算值与试验值吻合较好。
The uniaxial tensile test of concrete (TRC) sheet with single fiber and fiber braid was carried out to study the stress-strain relationship of the fiber bundle after epoxy resin impregnation. The experimental results show that the tensile strength of carbon fiber bundles can not be fully exerted even after being impregnated with epoxy resin. The stress-strain curve obtained by uniaxially stretched carbon fiber bundles is almost completely linear and reaches a certain limit of about 80% The nonlinear characteristics. Assuming that only the fiber braided net will bear the load after the cracking of fine-grained concrete, the stress-strain relationship of the carbon fiber bundles obtained from the uniaxial tensile load-deformation relationship of the TRC thin plate specimen can be reasonably reduced to a bilinear form. In the study of fiber braid gives the corresponding control parameter point value. Based on the computational theory of flexural members, the calculated values of two series of flexural members obtained by using the fiber bundle tensile model are in good agreement with the experimental values.