Unified strength model based on the Hoek-Brown failure criterion for fibre-reinforced polymer-confined pre-damaged concr
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Unified strength model based on the Hoek-Brown failure criterion for fibre-reinforced polymer-confined pre-damaged concrete columns with circular and square cross sections ZHANG Yang(张扬), LU Zhi-fang(卢志芳), CAO Yu-gui(曹玉贵) Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: 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. Key words: FRP-confined concrete; load-damaged; fire-damaged; unified strength model; Hoek-Brown failure criterion Cite this article as: ZHANG Yang, LU Zhi-fang, CAO Yu-gui. Unified strength model based on the Hoek-Brown failure criterion for FRP-confined pre-damaged concrete columns with circular and square cross sections [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4563-z.
1 Introduction At present, a large number of concrete structures have produced varying degrees of damage for various reasons [1−10]. The damage of a concrete structure leads to the reduction in the bearing capacity. To ensure the safety of the structure, it is necessary to repair the damaged concrete structure. As a kind of reinforcement material, increasingly concrete structures are
strengthened with FRP. For FRP-confined undamaged concrete columns, many studies have focused on the mechanical behaviour [11]. A large number of compressive strength models for FRP-confined undamaged concrete columns have been proposed. However, there are few relevant models for FRP-confined pre-damaged concrete. In general, FRP-confined pre-damaged columns fall into two categories: I) concrete columns confined by FRP after being heated and II) concrete columns confined by FRP after unloading.
Foundation item: Project(2017M622540) supported by the China Postdoctoral Science Foundation, China; Project(51808419) su
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