Effective strain of FRP for confined circular concrete columns

By Yufei Wu, Jiafei Jiang. 2013

179 citations recorded by the source corpus.

There is a consensus in the literature that the full material strength of fiber-reinforced polymer (FRP) cannot be utilized in FRP confined circular concrete columns and an efficiency factor is applicable to calculating the effective confinement pressure. However, large discrepancies of the efficiency factor have been reported, with values of the factor ranging from 0.274 to 1.133. An extensive experimental and analytical study was conducted in this work to reveal the causes of these discrepancies. The results indicated that the curvature and multi-axis stress condition of FRP jackets do not significantly reduce the efficiency factor, which contradicts the general understanding in the literature. Smaller factor values are generally caused by differences between the strain measurement systems used for the FRP jacket and the flat coupon, and differences in workmanship when they are made. These differences can be overcome by normalizing FRP fabrication methods and strain measurement systems. With the normalization scheme proposed here, a consistent efficiency factor of about 0.9 can be achieved for circular columns.

Subfields: Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/d7a7fb894b6ae446a4897128b5feff582ae2a3e7

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Building and Construction

1. J. Lim
2. Togay Ozbakkaloglu
3. T. Xie
4. T. Vincent
5. B. A. L. Fanggi
6. J. Ho

In Civil and Structural Engineering

1. J. Lim
2. Togay Ozbakkaloglu
3. T. Xie
4. T. Vincent
5. B. A. L. Fanggi
6. J. Ho

Citations in the corpus

• Axial compressive behavior of FRP-confined concrete: Experimental test database and a new design-oriented model (2013, background): “Teng, J.G., Jiang, T., Lam, L. and Luo, Y. , (2009).”
• Hoop strains in FRP-confined concrete columns: experimental observations (2015, background): “A number of factors contributing to lower efficiency in FRP jackets have been identified in previous studies [3, 5, 6, 8, 10–20], which include: (i) the differences between FRP jackets and flat coupons as a result of differences in fabrication processes and in situ forms; (ii) the differences in met”