The bearing capacity of members strengthened with prestressed carbon fiber reinforced plastic is improved significantly, however, the ductility of the members strengthened are reduced obviously. Moreover, no sign are observed before the failure and the failure process rapidly. The current study proposed a reinforcement method based on early-warning fuses theory to address this issue and took carbon fiber reinforced plastic as an example. First, it’s necessary to determine the area of carbon fiber board and the application of prestressed in each part of the member (early-warning fuses part and load-bearing part). This needs to be determined by the basic safety reserve and the additional safety reserve of the carrying capacity, then the calculation formula are derived; Second, designing six simulation beams and four test beams. Based on the comparison of the computation of the derived formula with the simulation and test results, the calculated values of the early-warning load agree well with the simulated and experimental values, and the calculated values of the ultimate load are less than the simulated and experimental values. This showed that the theoretical calculation method has high accuracy. In addition, various evaluation index prove that the members strengthened have sufficient reserves.

预应力碳纤维增强塑料加固后的构件的承载能力得到了显着提高，但加固后的构件的延展性明显降低。而且，在故障和故障过程迅速发生之前，没有观察到任何迹象。当前的研究提出了一种基于预警保险丝理论的增强方法来解决这一问题，并以碳纤维增强塑料为例。首先，必须确定碳纤维板的面积以及预应力在构件各部分（预警保险丝部分和承重部分）中的应用。这需要由基本安全储备和附加的安全承载能力决定，然后得出计算公式；其次，设计六个模拟光束和四个测试光束。根据推导公式的计算结果与仿真和试验结果的比较，预警载荷的计算值与仿真和实验值吻合良好，极限载荷的计算值小于仿真值和试验值。实验值。这表明理论计算方法具有较高的精度。此外，各种评估指标证明，增强成员具有足够的储备。