Abstract
The stress-strain behavior of concrete can be improved by providing a lateral passive confining pressure, such as fiber-reinforced polymer (FRP) wrapping. Many axial stress-strain models have been proposed for FRP-confined concrete columns. However, few models can predict the stress-strain behavior of confined concrete columns with more than two specified cross-sections. A stress-strain model of FRP-confined concrete columns with cross-sectional unification was developed in this paper based on a database from the existing literature that includes circular, square, rectangular and elliptical concrete columns that are highly confined by FRP jackets. Using the database, the existing theoretical models were evaluated. In addition, the ultimate stress and strain models with cross-sectional unification were proposed using two parameters: the cross-sectional aspect ratio and corner radius ratio. The elliptical cross-section can be considered as a rectangular one with a special corner radius for the model calculations. A simple and accurate model of the equivalent corner radius ratio for elliptical columns was proposed. Compared to the other existing models and experimental data, the proposed models show good performance.
Highlights
Various studies have been conducted on the mechanical performance of fiber-reinforced polymer (FRP)-confined concrete columns, and many models for the stress-strain relationship, ultimate strain and ultimate stress have been proposed [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]
The existing research results show that the cross-sectional shape of concrete columns has a significant impact on the FRP lateral confining pressure [12,19,20,27,28,29]
The average value (AV) and integral absolute error (IAE) index values show that the proposed models have better performance
Summary
Fiber-reinforced polymer (FRP) is widely used in structural strengthening and retrofitting [1,2,3,4,5]. Very few unified models have been proposed that can calculate the stress-strain behavior of FRP-confined concrete columns with various cross-sections [13,19,27,28]. This issue often causes inconvenience in structural retrofitting design. Practical engineering, the common cross-sections of reinforced concrete (RC) columns are square, rectangular, circular and occasionally elliptical. Variation of cross-sections froma square/rectangular to stress-strain circular/elliptical. Because the strain-hardening case is more common than strain-softening, this paper focuses on is considered by adjusting the cross-sectional aspect ratio and the corner radius ratio. Strain-hardening caseof is concrete more common than strain-softening, this paper focuses on the stress-strain behavior of concrete with strain-hardening (or with high confinement)
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