Fibre-reinforced polymer (FRP) has the advantages of high strength, light weight, corrosion resistance and convenient construction and is widely used in repairing and strengthening damaged concrete columns. Most of the existing strength models were built by regression analysis of experimental data; however, in this article, a new unified strength model is proposed using the Hoek-Brown failure criterion. To study the strength of FRP-confined damaged and undamaged concrete columns, 900 test data were collected from the published literature and a large database that contains the cross-sectional shape of each specimen, the damage type, the damage level and the FRP-confined stiffness was established. A new strength model using the Hoek-Brown failure criterion was established and is suitable for both circular and square columns that are undamaged, load-damaged and fire-damaged. Based on the database, most of the existing strength models from the published literature and the model proposed in this paper were evaluated. The evaluation shows that the proposed model can predict the compressive strength for FRP-confined pre-damaged and undamaged concrete columns with good accuracy.

纤维增强聚合物（FRP）具有强度高，重量轻，耐腐蚀，施工方便等优点，被广泛用于修复和加固受损的混凝土柱。现有的大多数强度模型都是通过对实验数据进行回归分析而建立的。但是，在本文中，使用Hoek-Brown破坏准则提出了一个新的统一强度模型。为了研究FRP约束的受损和未损坏的混凝土柱的强度，从已发表的文献和大型数据库中收集了900个测试数据，该数据库包含每个试样的横截面形状，破坏类型，破坏程度和FRP约束刚度建立。建立了使用Hoek-Brown破坏准则的新强度模型，该模型适用于未损坏的圆柱和方柱，负载损坏和火灾损坏。基于该数据库，评估了已发表文献中大多数现有的强度模型以及本文提出的模型。评估表明，所提出的模型可以很好地预测FRP约束的预损伤和未损伤混凝土柱的抗压强度。