In the area of structural rehabilitation, extensive research has been conducted on stress-strain models for fiber-reinforced polymer (FRP)-confined concrete. Most of the existing models are developed from tests conducted under laboratory conditions. However, structural repair work on concrete structures is usually applied to damaged concrete, which has different mechanical properties compared with those of normal concrete. An analysis-oriented stress-strain model of FRP-confined predamaged concrete columns was studied in this paper for the first time. Two state-of-the-art databases, including the cross-sectional variables, concrete damage degree, and FRP-confined stiffness, were established by collecting 313 test data points from the literature. Parameters in the analysis-oriented stress-strain model were well developed for FRP-confined predamaged concrete. The proposed models are unified in terms of column cross sections, which can predict both FRP-confined circular and square columns by considering the factor of the corner radius ratio. The proposed model shows a good performance by comparison with test data.

在结构修复领域，对纤维增强聚合物（FRP）约束混凝土的应力-应变模型进行了广泛的研究。现有的大多数模型都是根据在实验室条件下进行的测试开发的。但是，混凝土结构的结构修复工作通常应用于受损混凝土，与普通混凝土相比，它们具有不同的机械性能。本文首次研究了一种以分析为导向的FRP预应力混凝土柱应力应变模型。通过收集文献中的313个测试数据点，建立了两个最新的数据库，包括横截面变量，混凝土破坏程度和FRP约束的刚度。对于FRP约束的预损伤混凝土，针对分析的应力-应变模型中的参数已得到很好的开发。所提出的模型在圆柱截面方面是统一的，可以通过考虑角半径比的因素来预测FRP约束的圆形和方形圆柱。通过与测试数据进行比较，所提出的模型显示出良好的性能。