To overcome the lagged strain and insufficient stiffness of conventional reinforced structures, this article proposes a reinforcement method realized by combining prestressed polyethylene terephthalate (PET) straps and angle steel. This combined reinforcement method relies on the active restraint force provided by the PET straps and the vertical bearing capacity provided by the angle steel to improve the bearing capacity and ductility of reinforced structures. This article introduces the experimental process applied to the combined reinforced columns. Thereafter, a finite element simulation model of the columns strengthened by prestressed PET straps and angle steel was established on the basis of the experiment. A plastic damage model was used for the concrete. An ideal elastoplastic model was used for the PET straps, angle steel, and steel bars. In the finite element simulation analysis, a multiparameter analysis was conducted on the eccentric distance, packaging distance, and packaging method. The research results showed that as the packing spacing of the PET straps decreases, the confinement area of the column increases, and the load-bearing capacity and ductility of the specimens increase to some extent. With the increase in the eccentricity, the increase in the bearing capacity of the combined reinforced column is less. Nevertheless, there is significant improvement in the ductility performance. Considering the economy and reinforcement effects, the mesh packing method produces the best results. This article introduces parameters such as the restraint stress of the PET straps and the utilization rate of the angle steel. A calculation formula for the small-eccentric bearing capacity of the combined reinforced column was established, providing a theoretical basis for engineering applications.

为了克服传统加固结构的滞后应变和刚度不足的问题，本文提出了一种通过预应力聚对苯二甲酸乙二醇酯（PET）带和角钢组合实现的加固方法。这种组合加固方法依靠PET带提供的主动约束力和角钢提供的竖向承载力来提高加固结构的承载力和延性。本文介绍了应用于组合式钢筋柱的试验过程。此后，在试验的基础上建立了预应力PET带和角钢加固柱的有限元仿真模型。混凝土采用塑性损伤模型。理想的弹塑性模型用于 PET 带、角钢和钢筋。在有限元仿真分析中，对偏心距、包装距离、包装方式进行了多参数分析。研究结果表明，随着PET条带填料间距的减小，柱子的约束面积增大，试件的承载能力和延性都有一定程度的提高。随着偏心距的增加，组合加强柱承载力的增加幅度较小。然而，在延展性方面有显着改善。综合考虑经济性和加固效果，网格填充法效果最好。本文介绍了PET带的约束应力和角钢的利用率等参数。