Large Rupture Strain FRP-Confined Concrete Columns of Different Sizes: Experiments and Stress–Strain Models
Source abstract
Abstract
Extensive experimental and theoretical studies of large rupture strain (LRS) fiber-reinforced polymer (FRP)-confined concrete columns have been conducted based on small-scale columns, mostly with a diameter of 150 mm. This paper presents the first-ever study on the axial performance of LRS polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) FRP-confined large-scale concrete columns. Twenty PET FRP-confined circular concrete columns and 20 PEN FRP-confined square concrete columns were loaded concentrically. The cross-sectional diameter or side length ranged from 100 to 400 mm. The effects of specimen size and FRP volume ratio on the failure mode, axial stress–strain relationship, and dilation behavior were investigated. The load-carrying capacity and ductility of LRS FRP-confined concrete increased with an increase of the FRP volume ratio. As the specimen size increased, the confinement efficiency of the FRP decreased, resulting in a lower strength enhancement. The accuracy of existing size-dependent strength models was also evaluated using the residual error. Furthermore, a modified size-dependent model for LRS FRP-confined circular/square concrete columns was developed, which was shown to have a more satisfactory performance than the existing models. The proposed model can serve as a basic model for the seismic analysis of strengthened reinforced concrete (RC) columns with LRS FRP, with the possible size effect duly accounted.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Structural Behavior of Reinforced Concrete · Concrete Corrosion and Durability · Structural Response to Dynamic Loads
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Ph.D. Candidate, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Univ. of Technology, Beijing 100124, China.
Professor, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Univ. of Technology, Beijing 100124, China.
Professor, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Univ. of Technology, Beijing 100124, China (corresponding author). ORCID: .
Master’s Student, Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Univ. of Technology, Beijing 100124, China.
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